Nissan Engine Code P0420

After numerous dead end threads I found. Code P0420 Catalyst Efficiency Below Threshold Bank 1. Our weblog supplies the most recent report abo. I don't have the answer as to why the check engine light is back on with the P0420 code. How Should You Fix The Code P0420? The right way to fix the P0420 code depends on exactly where in your system it originates. Reason for Nissan Cube P1421 and find the solution for the code Nissan Cube P1421 , we'll give to how to fix Nissan Cube P1421 trouble code problem. I recently purchased this car, and today the check engine light and VSC came on. The car has over 200k miles on it, still drives strong except for a noticeable loss of power when on a/c. It covers Nissan Rogue P0420 meaning, symptoms, causes, and possible solutions. P0420 2012 NISSAN ROGUE Tech Notes As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Idle speed control system RPM. Related: P0442 Nissan Rogue. In other words temp not hot enough cat is screwed possible engine damage to follow very soon get it fixed. P0420 Tech Notes As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). SHANAREED4 that code it only show's if it was a bad cat causing that code the 3 way manifold cat on the engine not the cat under. Be sure to double check the codes. com 2010 Nissan Altima code P0420 2 Answers. It's actually a generic code, meaning it can be thrown from any vehicle after 1996. Other popular codes include P0171, P0300, P0455, P0442, etc. I have read threads but my cause may be different. Nissan Titan P1564 OBD-II Diagnostic Powertrain (P) Trouble Code Information Page. I wanted to let people know this to encourage them that it is not always the catalytic converter that is the problem. A P0101 Nissan trouble code is very common and there are two fixes for it. A P0420 code can be caused by many things. How Should You Fix The Code P0420? The right way to fix the P0420 code depends on exactly where in your system it originates. Vacum leaks the code. The way it was coming on when I accelerated makes me think it's the sensor going out or being faulty. View all photos of 2001 Nissan Pathfinder Engine Code P0420 - Truck Trend Garage at. Bank 2 Sensor 1 Nissan Sentra. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Seems this p0420 catalyst version of your antivirus software Which appears not to using PIII don't expect so much. Nissan Service Bulletin about the p0420 code which applies to the 2001 4 cyc KA24 engine. SOURCE: I have a code P0420 on my 2005 Nissan Altima. I have seen a bad DV put up the P0299 code before, i would suggest checking that as well as leaks in the boost system and the boost sensor. I've posted this info in other threads re. Look to make an appointment when it is convenient to lose the car for a day. Sorry it's been a while since I've been on here. This maybe why no crankshaft code, but the fix so far is the crankshaft sensor!. P0420 Nissan Description The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor). P0420 - Catalyst System Efficiency Below Threshold (Bank 1). I received the P0420 code several months ago. So this engine code article applies to Nissan, Toyota, Chevrolet, Ford, Honda, GMC, Subaru, VW, etc. com 2010 Nissan Altima code P0420 2 Answers. The trouble codes are p0420 and p0430 that is catalyst system below threshold bank 1 and 2. Nissan Service Bulletin about the p0420 code which applies to the 2001 4 cyc KA24 engine. • Erase the DTC code. Was driving my car home from work last week and it popped the Service Engine light on with code P0420, referencing the catalytic converter. This Diagnostic Trouble Code (DTC P0420) relates to the efficiency of the catalytic converter on Bank 1. I have a 2006 Nismo with V6 4. The light could mean a costly problem, like a bad catalytic converter, or it. Friday I put gas in my car. mini cheap motorcycle car vehicle gsm alarm gprs auto gps tracker scooter track. I plugged in the scan tool not expecting to find any codes but I did get a code P0420 "emission system not operating to full efficiency. service engine soon light returns codes p0430 and p0420. Friday I put gas in my car. Exclusive Content. Nissan Code P0420 Definition. 5-liter V-6. It says a common fix is to have the ECM Reprogramed. It was a hefty price. Here are the most common ones. 2010 Nissan Altima code P0420 2 Answers. It stayed on for a couple of days and then turned off. P0420 Code After Cat Replacement P0420 is the only code in the database. Change thsi one or Try to clean it will work fine. Among them are exhaust leaks, a bad O2 sensor, or (truly)worn-out cats. I wanted to let people know this to encourage them that it is not always the catalytic converter that is the problem. Sure I am a single parent and do not have lot money, but I got to get tags on the car and I do not know what to change for sure. There are many things that can cause the P0420 trouble code in your Cube. The radiator upper hose is empty and temp Gauge rocker just enough to notice it. [QUOTE=ctalford;74165]I have a 05 Pathfinder SE and I'm getting the p0420/p0430 codes. Cost of diagnosing the P0420 2012 NISSAN ROGUE code. Got codes? Read these informative engine light articles and get professional advice from automotive technicians to help you get a handle on check engine light codes and testing procedures. I have a 2006 Liberty and the P0420 code came on, shortly after that 3-4 days the engine lost power and was undriveable and registered a (random misfire code). Hi, I have a 2000 Maxima, recently i have the code p1320 for 4times and p0420 for 2 times, couple of times after I started the car and the engine was shaking like missfired and smoothed out after restarted. 050 never going above 300. No major issues thus far. Engine Light Codes P0420 Image Search Results Pictures to pin on 1000 x 918 · 72 kB · jpeg Source. and Answers. Try it free for 14 days. enginetroublecode. I have a 2006 Nismo with V6 4. The car has over 200k miles on it, still drives strong except for a noticeable loss of power when on a/c. Our weblog supplies the most recent report abo. I am no mechanic but I got this far but I don’t know what to expect replacing a engine which is really really expensive. The trouble codes are p0420 and p0430 that is catalyst system below threshold bank 1 and 2. In order to be able to post messages on the Nissan Cube Life - Nissan Cube Car Forums forums, you must first register. I had a Service engine soon light on and had it coded, the code I got was p0420 catalyst efficiency below threshold. There is a TSB(EG047-05) for the 2001-2003 model years. Check engine code are universal. The worst complaints are engine failure, engine knocking, and low oil pressure, sludge build up. So it can be any cars from any brand and a, let say P0123 for exemple check engine code will be the same trouble for all cars. I maintain my car, change oil, tune up and rotate and aligned the car in time schedule. 0 hour of labor. It depends on how old it is. Nissan Check Engine Light Codes. When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. P0420 codes and will offer my 2 cents about what has worked for me. I have a 07 with 238,000 mile on the tuck, the shop that did. Plug in the BDPP and read P0420- Cat. The radiator upper hose is empty and temp Gauge rocker just enough to notice it. Just what does that mean?. The 3 codes this to format external ZIP-TIED, not clamped. It is giving a code p0420 and I need to know what it could really be for. I might have to replace the engine codes 0300,p1217,p1168,p0420,p0051 I drove to autozone and they gave me a list of these codes. Symptoms of a P0420. Altima 2005. The first step to read the codes is setting the ECM in Diagnostic Test Mode II. i failed my emissions inspection today due to OBD diagnostic codes. Idle speed control system. Sure I am a single parent and do not have lot money, but I got to get tags on the car and I do not know what to change for sure. Average repair cost is $1,000 at 132,000 miles. 0 hour of labor. (2006 Nissan Altima) The code read was P0420, catalyst system efficiency below threshold (bank 1) which could be the cat converter or the o2 sensor not functioning properly. com P0420 NISSAN Meaning The Engine Control Module monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor). The problem can be due to the CAT not functioning properly or a defect with the rear oxygen sensor which is used to report the condition of the exhaust exiting the CAT. Patrick Marcello from my6 FB group is currently doing a limited run of his 6thgen Custom Fenders. No the p0420 code is for the catalyst control being below threshold. Nissan Code P0420 Common Diagnosis Mistakes. Here are the typical symptoms that something is wrong when you have code P0430. OBDII Code P0420 NISSAN - Catalyst System Efficiency Below Threshold Bank 1 | Nissanhelp. This means that the secondary O2 sensor detects. 2007 Nissan Maxima P0420 code. This Diagnostic Trouble Code (DTC P0420) relates to the efficiency of the catalytic converter on Bank 1. I run BP 93 octane, but for a while, I was running 93 ethanol free gas from Quality Mart. code showed up p0420, the bank one catalytic converter. P0420 "Catalyst System Efficiency Below Threshold (Bank 1)". It is all here!. 5-liter V-6. They cleared the code and the CEL stayed off until this morning. nissan australian aussie australian x-trail nissan x-trail x-trail forum australian xtrail forum xtrail club x-trail club xtrail forum x-trail australia x-trail accessories cars The official home of the Nissan X-TRAIL enthusiasts in Australia. Keyword CPC PCC Volume Score; p0420 code: 1. , Automotive, 25 replies Check Engine Light code P0126, Automotive, 5 replies Check Engine Light - cd p0420 - Catalytic Converter replacement, Automotive, 28 replies check engine light code 1456 gas cap!, Automotive, 9 replies. Bank 2 Sensor 1 Nissan Sentra. Nissan has pretty much maintained the same exhaust manifold design language for all their V8s. If you have a P0420 code, this could be caused by a number of different things. 2007 Nissan Maxima P0420 code. My motherboard nissan p0420 catalyst in the wrong forum p0420 Arraybut nothing newer than diablo II. A couple of weeks ago a 2002 Toyota Corolla came into the shop with the P0420 code. Within a 30 minute drive the car was driving rough. seems to be a common issue for the murano. Nissan Versa P0420 OBD-II Diagnostic Powertrain (P) Trouble Code Information Page. Top Causes of P0420 in the Nissan Frontier. This code is generic and is the same on all vehicles. Again, I think they were trying to clear the check engine light on the dash. Fix any other codes that come up first. Now it has 222220 miles still with the original engine and transmission. P0420 Symptoms. on a load it hesitates every 5 mins or sooner or constant. Well, I think I have made some progress on the P0420 code, now I want to figure out how to deal with my poor mpg issue. P0420 - Catalyst System Efficiency Below Threshold (Bank 1). I was told it was a bad catalytic converter, so I went ahead and replaced it. What Does OBD-II Fault Code P0420 Mean? OBD-II Code P0420 is defined as a Catalyst System Efficiency Below Threshold. Is your BMW's check engine light on, with the scanner showing the dreaded P0420 or P0430 catalytic converter efficiency below threshold fault codes? If so, you may have already been shocked and horrified by a $3,000+ repair estimate and you're wondering what to do next. Here are the most common ones. How to read the engine diagnostic code. I just reset the code and searched on TT. There are many things that can cause the P0420 trouble code in your Rogue. Within a 30 minute drive the car was driving rough. Nissan Altima P0075 Engine Trouble Code When your car's 'Nissan Altima P0075 Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. CarComplaints. Could a bad fuel cap cause this code somehow? Tried to order a new fuel cap and everyone is saying it has been discontinued. Reason for Nissan Versa P0420 and find the solution for the code Nissan Versa P0420 , we'll give to how to fix Nissan Versa P0420 trouble code problem. So it's that time of year when I have to get smogged, and I'm getting a check engine light indicating both P0420 and P0430 (P0430 Catalyst System Efficiency Below Threshold (Bank 2)/P0420 Catalyst System Efficiency Below Threshold (Bank 1)) at the same time. Check specific manufacturer pages on the site, as some of them, we list the OBD2 codes on those pages for those specific vehicles. $1300 later with a new set of cats the CE light came on again. Cost of diagnosing the P0420 2012 NISSAN ROGUE code. P0420 = Catalyst System Efficiency Below ThresholdCatalyst System Efficiency Below Threshold. Have the infamous P0420 Code. 3 days later the check engine light came on. Here are the most common ones. My gas mileage is still about the same and no power difference from before the check engine light come on. Page 3 of 5: TEST 2: Checking the Output of the Rear Oxygen Sensor. I suspect got something wet or damaged something but can not see anything obvious. I'm driving a 2006 Off-Road Xterra. on a load it hesitates every 5 mins or sooner or constant. Nissan Murano P1701 Engine Trouble Code Nissan Murano P1701 code can be about replacing a broken oxygen sensor can eventually lead to a busted catalytic convertor which can cost upwards of $2,000. They told me the computer gave an OBD II code of P0420. Here is full description: The Catalytic Converter takes t. P0420 2012 NISSAN ROGUE Tech Notes As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Do you smell rotten egg smell from your exhaust? If yes, then your catalytic converter is definitely dead. If you have a P0420 code, this could be caused by a number of different things. i have a 2002 Nissan altima and it is pulling po 300 and po 300pr code it is a 4. Do not overlook other codes that are paired along with P0420. Related: P0442 Nissan Frontier. A few months later the idle seemed to go back to normal for about a month than the idle went high again this time the engine would surge when driving at a steady speeds on random occasions then the check engine light came on and I did not check the code before it went out and the surging stopped. A check engine light can indicate a broad spectrum of problems with your 2009 Nissan Murano. P0420 engine code for 2016 Nissan Micra provides below are generic codes that may not apply to all vehicles. This Diagnostic Trouble Code (DTC P0420) relates to the efficiency of the catalytic converter on Bank 1. Most auto repairs shops charge between $75 and $150 per hour. They told me i needed to replace the cat but I dont think it is my cat because i am not. The code for the cat ineffiency came up and they tried to fix it by pulling the secondary cat (Nox cat maybe) and put in a exhaust pipe in its place. My Nissan Titan threw codes P0420 & P0430. Other popular codes include P0171, P0300, P0455, P0442, etc. Here are the most common ones. NISSAN Code P0420 - Catalyst System Efficiency Below Threshold Bank 1. The P0420 code is stored in memory when the ECU detects a low efficiency in the catalyst system for bank number 1 (the bank of cylinders where cylinder number 1 is located). Hey guys, My CEL turned on two days ago and I pull up a manufacturer-specific code: P1138 Swirl Control Valve on my 2004 Nissan Sentra 1. It also divides Both CAT's this contact form and still had the light. When check engine lights are scanned, a p0420 code is a very common result. Automotive Circuit Testing 101 - Check Engine Light Help. Related: P0442 Nissan Frontier. My 2000 Nissan Maxima just failed the emissions test due to a bad gas cap and for the check engine light being ON. Cost of diagnosing the P0420 code. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. I don't have the answer as to why the check engine light is back on with the P0420 code. 2007 Nissan Versa engine problems with 45 complaints from Versa owners. What are some troubleshooting steps I can do before taking it. Keyword Research: People who searched p0420 code also searched. Your OBD II system may be over-reacting to P0420 Nissan is all about the cash. My name is Michael I am new to this website and have a couple questions i can hopefully find answers for. Possible causes - Three way catalyst converter Bank 1 - Exhaust tube - Intake air leaks - Fuel injectors may be faulty - Fuel injector leaks - Spark plugs may be faulty - Improper ignition timing - Engine Control Module (ECM) Notes As the Nissan P0420 code description implies the Nissan P0420 code means that the…. I checked and there is a TSB on that code for this vehicle. Average repair cost is $1,000 at 132,000 miles. Visit the post for more. i failed my emissions inspection today due to OBD diagnostic codes. What Does P0420 Mean For Your Nissan? The function of the catalytic converter is to break down harmful pollutants that are created by your Nissan during the combustion cycle and convert them into harmless gases. How to Test Trouble Code P0420 (GM 3. The engine ECU kicks off the P0420 code long before the cats are truly worn out. Sign in to P0420 code which suggests malfunction of Cat convertor or O2 sensors. I have a 2005 nissan maxima and check engine light came on,check with the scanner and and code p0420 show. I found this site on how to scan the car. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Both my vehicles one a 2003 GMC Envoy SLT and 2009 Nissan Murano SL. They cleared the code and the CEL stayed off until this morning. Keyword Research: People who searched p0420 code also searched. My 2000 Nissan Maxima just failed the emissions test due to a bad gas cap and for the check engine light being ON. So if ya having a p0420 or p0430 code and due for inspection, give it a try. • Erase the DTC code. Within a 30 minute drive the car was driving rough. Possible causes - Three way catalyst converter Bank 1 - Exhaust tube - Intake air leaks - Fuel injectors may be faulty - Fuel injector leaks - Spark plugs may be faulty - Improper ignition timing - Engine Control Module (ECM) Notes As the Nissan P0420 code description implies the Nissan P0420 code means that the…. " Since the CEL light is not on, I'm wondering if I should just erase the code or leave it alone. Average repair cost is $1,000 at 132,000 miles. Hey guys, My CEL turned on two days ago and I pull up a manufacturer-specific code: P1138 Swirl Control Valve on my 2004 Nissan Sentra 1. Here are the typical symptoms that something is wrong when you have code P0430. Sensor two sits. com 2010 Nissan Altima code P0420 2 Answers. 2002 nissan altima service engine light code p0420, I have a nissan altima 2002, with checks to isolate swirl control valve system problem-2004 Nissan 3. I received the P0420 code several months ago. Here are the most common ones. No major issues thus far. 2007 Nissan Versa engine problems with 45 complaints from Versa owners. Top Causes of P0420 in the Nissan Cube. Gas mileage is fine too. 2006 Nissan Altima - P0420 P0420 code fix. There aren't usually any drivability issues associated with P0430. Engine-codes. P0420 Code After Cat Replacement P0420 is the only code in the database. P0430 NISSAN Tech Notes As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Graphing the output on an OBDII scanner shows an erratic curve with varying amplitude and frequency. 2010 Nissan Altima code P0420 2 Answers. Have any other members had this done to their 2001 Nissan with the 4 cyc KA24 engine? I stopped at a Nissan Dealer and the service rep. Average repair cost is $1,000 at 132,000 miles. It is giving a code p0420 and I need to know what it could really be for. 0 The cost of diagnosing the P0420 2004 NISSAN MURANO code is 1. You may not have to replace the catalytic converter with this easy repair. Not really sure what i should do replace the cat's or use a 02 simulator. What Does P0420 Mean For Your Nissan? The function of the catalytic converter is to break down harmful pollutants that are created by your Nissan during the combustion cycle and convert them into harmless gases. 9: 9401: 59: p0420 engine code: 0. Related: P0442 Nissan Rogue. As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). It also divides Both CAT's this contact form and still had the light. nissan altima code p0420 When a converter fails the fault code will be p0420 and or p0430. P0420 Nissan Description The Engine Control Module monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor). The mechanic said the passenger side cat was burned up and plugged. Only the p0430 code threshold bank a Samsung LCD and Asus N56VJDH71 laptop. i failed my emissions inspection today due to OBD diagnostic codes. This means that the secondary O2 sensor detects. The rear bank on a V-6 nissan is bank one is also where the #1 cly is located. 3 week ago engine light came on. 2008 Nissan Altima - P0420 code So i took my car to autozone to see what the check engine ligt was on for and they told me that is was p0420. Hi everyone, Yesterday while driving to work my SES light came on. There aren't usually any drivability issues associated with P0430. 2007 Nissan Maxima P0420 code. 5 SE with a 3. The car runs great still, I don't feel anything different or abnormal. As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. Nissan driver since 2003!. I have a Nissan Primera (2001). This car fails every time it has to get a smog check. Altima 2005. This maybe why no crankshaft code, but the fix so far is the crankshaft sensor!. Consequently, if the Check Engine light is on and you have a P0420 code (or any other code), you will FAIL the test -- unless the state allows you to take an alternate tailpipe emissions test to see if your vehicle is actually polluting. 2005 SL here. It stayed on for a couple of days and then turned off. Catalytic the code is P0420 and P0430'. I also noticed my fuel mileage decreased. I am now inclined to suspect that we might have a computer problem. I want to know what kind of money iam looking at. DA: 76 PA: 1 MOZ Rank: 87. I have a 2000 Nissan Altima with aprox 136k miles. This means that the secondary O2 sensor detects. I need some help in correcting the code P0420. The actual problem might be elsewhere in your engine. Engine Code and Check Engine Light P0420 and P0507 for Nissan Altima Code P0420 for two sensor. I was told it was a bad catalytic converter, so I went ahead and replaced it. I just purchased my pathfinder a month ago and it has been a great car. While code P0420 can afflict any application, this code is extremely common on Nissan applications such as Sentra, Rogue, Altima, and other models that are fitted with the QR25DE range of engines, which is widely regarded in the global auto repair industry as one of the worst engines Nissan has ever produced. If any other codes are present, they should be addressed first. My codes started right after I pressure washed the engine and underside after going hunting last december. My mileage is at 103k and nissan dealer says its past warranty for catalytic converts. I have seen a bad DV put up the P0299 code before, i would suggest checking that as well as leaks in the boost system and the boost sensor. The P0420 code can be a bit tricky to diagnose correctly, as you think that you have fixed the fault and then 100 km's later the light pops up again. It is giving a code p0420 and I need to know what it could really be for. com : Car. Here is full description: The Catalytic Converter takes t. I maintain my car, change oil, tune up and rotate and aligned the car in time schedule. For the last 2 years it has had a P0420 code that I have used a scan tool to erase a half dozen times in those 2 years. machine to figure out why my check engine light is. Injector cleaner was a temp fix on my 2005 Altima S at 130k. " Since the CEL light is not on, I'm wondering if I should just erase the code or leave it alone. High miles but drove great and price was really good for a CVT. I have done research on a few. Here are the most common ones. So I just saw my check engine light come on. My name is Michael I am new to this website and have a couple questions i can hopefully find answers for. I'm driving a 2006 Off-Road Xterra. Average repair cost is $1,000 at 132,000 miles. I have a 2006 Nismo with V6 4. P0420 "Catalyst System Efficiency Below Threshold (Bank 1)". The Malfunction Indicator (Check engine) Light is on from some time. Cheap fix for your P0420 check engine light; How to fix code P0420 or lack of acceleration on Honda CR-V and other make and models; PO420 Code. Don't spent spend tons of $$$. P0420 DTC Code - Catalyst System Efficiency Below Welcome to P0420. 7:1? 3) How much does the MAF sensor influence the. My codes started right after I pressure washed the engine and underside after going hunting last december. Volkswagen Volvo Code for the check engine light recommended a catalytic converter. 0 hour of labor. I had a Service engine soon light on and had it coded, the code I got was p0420 catalyst efficiency below threshold. I need can recommend for > Disk Drives. So this engine code article applies to Nissan, Toyota, Chevrolet, Ford, Honda, GMC, Subaru, VW, etc. Gage Data Out of Range. Average repair cost is $1,000 at 132,000 miles. My 2000 Nissan Maxima just failed the emissions test due to a bad gas cap and for the check engine light being ON. This means that the secondary O2 sensor detects. Nissan driver since 2003!. I bought this car brand new and the first check engine I had was when my car reach 2k miles and Midcity nissan in Chicago reprogram the ecu to erase it, from there I always get check engine twice a year. Large vacuum leak fuel system fault are things that will cause converter failure. My s40 failed for 3 codes p0420,p0700,&p0705 I had a hole in the exhaust. Keyword CPC PCC Volume Score; p0420 code: 1. This page is meant to help you troubleshoot the Nissan Rogue P0420 trouble code. How Should You Fix The Code P0420? The right way to fix the P0420 code depends on exactly where in your system it originates. Nissan Altima Check Engine Light Due to Failure of Catalytic Converter Closest to Cylinder Head - 573 reports. Related: P0442 Nissan Frontier. - P0420 Catalyst Check Engine Engine DTC Code Article. the customer ask if the new. You choke on the estimate of $1400 or more to replace the converter on your car. com Infiniti QX56 P0420 Engine Trouble Code When your car's 'Infiniti QX56 P0420 Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. Nissan Service Bulletin about the p0420 code which applies to the 2001 4 cyc KA24 engine. 0 hour of labor.