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Odb2 Error Code P0420

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Policy Safety Statement Catalogs Education Literature Video Training Tech Tips Our Distributors News Contact Location Information Converter Quarterly Sign-up Free Catalytic Converter Request for Quote - Diesel The Misleading Nature of the PO42O Code By Ken Schafer Jr. © Reproduced with permission from Undercar Digest. For subscription information call 800-274-7890 or visit www.mdpublications.com. Upon the arrival of p0420 honda the Onboard Diagnostics II (OBD-II) system, I remember thinking to myself that this new system was going to be the greatest thing to happen to vehicles since I had started working on them. Now all I needed to do was plug in a scan tool, since all vehicles would have the same data-link connector (DLC) much to my delight again, and the car would tell me what was wrong with it. Sadly, it was only a few weeks later that I learned that this new system was still only a guideline and not a complete diagnosis. Throughout the years, after the start of OBD-II, it has become more and more accurate, but it still requires a bit of investigating after retrieval of the diagnostic trouble codes (DTCs). The P0420 code is no different. Here is a scenario: A customer pulls into the shop and says, “My check-engine light is on.” I tell them that I will scan the vehicle and find out what the problem is. Once I hook the s

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owners How it works Services Pricing AdviceMoreAdvice Articles & Questions Ask a Mechanic Scheduled maintenance Estimates Parts Cars p0420 nissan More About our mechanics Become a mechanic Reviews Contact Get a quoteNeed help?Call us: (800) 701-6230Need help?Call us: (800) 701-6230Get a quote Search Skip the auto shop - Our http://www.easterncatalytic.com/education/tech-tips/the-misleading-nature-of-the-po42o-code/ mechanics make house callsBook a service600+ car repair, maintenance & diagnostic services at your doorstep.Get a quoteAsk a mechanicHave a car question? Get free advice from our expert mechanics.Ask for freeManage car onlineTrack services, save quotes, get maintenance reminders & more.Join for free Home Articles P0420 OBD-II Trouble Code: Catalyst System Efficiency Below Threshold (Bank 1) P0420 OBD-II https://www.yourmechanic.com/article/p0420-obd-ii-trouble-code-catalyst-system-efficiency-below-threshold-bank-1-by-jamahl-walker Trouble Code: Catalyst System Efficiency Below Threshold (Bank 1) by Jamahl Walker on April 06, 2016 ShareTweetPin P0420 code definition Catalyst System Efficiency Below Threshold (Bank 1) What the P0420 code means The catalytic converter pulls in the pollutants that are expelled by the cylinders and uses oxygen to break up these harmful pollutants. Therefore, the catalytic converter is able to reduce the emissions expelled from the exhaust pipe. This is the purpose of the catalytic converter. The catalytic converter has two oxygen sensors. One oxygen sensor is positioned in front of the catalytic converter and the other oxygen sensor is positioned in the rear. The upstream oxygen sensor is located in front of the catalytic converter. If the upstream oxygen sensor is working properly, its readings should fluctuate when the car is warm and when in closed loop. The downstream oxygen sensor is located behind the catalytic converter. If the downstream oxygen sensor is working properly, its readings should remain steady. When the oxygen sensors have a reading that is si

For Shop Owners RegisterSign InCancel Get Your Car FixedGet an EstimateFind A ShopWhy Certified? Learn About Your CarCar OverviewCommon ProblemsQuestionsRecallsReviewsFair Price EstimatesEncyclopediaCar Care Advicehttp://repairpal.com/obd-ii-code-p0420 encoding="utf-8"?> About RepairPalRepairPal OverviewTeamFAQPartnersNews & MediaBlogAdvertiseSupportContact UsRepairPal Get Your Car FixedGet an EstimateRepairPal uses national and regional data to ensure fair prices. Our Certified http://www.engine-misfire.com/p0420/ shops honor these estimates.Find a ShopRepairPal certifies only the best shops in your neighborhood by verifying quality work, training, and customer satisfaction.Why Certified?Certified Shops honor fair p0420 honda price estimates, bringing trust and transparency to an industry nottypically known for it.Learn About Your CarCar OverviewRelevant information about your vehicle, all in one placeCommon ProblemsReported by drivers like youQuestionsAsk a mechanic in our communityRecallsExplained by our expertsReviewsShared by vehicle ownersFair Price EstimatesFor thousands of car repairsEncyclopediaDefinitions of systems and partsCar Care odb2 error code AdviceTips for keeping your car healthySearch |For Shop OwnersSign inRegisterEncyclopedia›Exhaust and Emissions›P0420 - OBD-II Trouble CodeP0420 - OBD-II Trouble CodeOBD II Fault Code OBD II P0420 Fault Code Definition Catalyst System Efficiency Below Threshold Symptoms Check Engine Light will illuminate In most cases, there are no adverse conditions noticed by the driver In some cases, there may be some performance problems noticed by the driver such as a lack of power from a restricted and/or damaged Catalytic Converter Common Problems That Trigger the P0420 Code Inefficient Catalytic Converter(s) Defective Front or Rear Oxygen Sensor(s) Misfiring engines Common Misdiagnoses Oxygen Sensors Polluting Gases Expelled HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog CO (Carbon Monoxide): Partially burned fuel that is an odorless and deadly poisonous gas NOX (Oxides of Nitrogen): One of the two ingredients that, when exposed to sunlight, cause smog Notes Volkswagen , Aud

that your computer has detected that the Catalytic converter has failed on bank one. (Bank one is the side that the number one cylinder is on. Bank two is the other side.)  After the computer sees that this test fails so many time, will will store this P0420 code in the computer and light the check engine light or MIL light. Diagnosing P0420 catalyst efficiency code To be able to diagnose this p0420 converter efficiency code, we need to have a good understanding of how this system works. From all of my years going to class the easiest way I can describe it to you is that the catalytic converter stores oxygen. When it goes bad, it no longer has the ability to store oxygen and the computer will flag this P0420 code. On a computer controlled OBD2 vehicle, there will be one oxygen sensor before the cat and one after the cat. When the engine is running and is fully warmed up, the computer compares the two o2 oxygen sensor signals for a predetermined amount of time. If the converter is storing oxygen, then the rear oxygen sensor signal will produce a much different signal back to the computer than the front oxygen sensor. This is good. This is what the computer is looking for. This means the catalytic converter is doing its job (storing oxygen). When the computer sees that the two oxygen sensor signals are the same, this indicates that the catalytic converter is no longer storing oxygen like it should. The computer will then light your check engine light or malfunction indicator lamp and store the fault code P0420. How do I know if my converter is bad? If you get this P0420 diagnostic trouble code and you want to do some of your own testing, there are a number of ways to check the catalytic converter. One good way to check your converter to see if it is "lighting off". This means that the converter is burning up the emissions on the inside. Remember, the hotter the converter gets, the cleaner it will run. The converter should be about 100 degrees hotte

 

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