Error Code P0420 Honda Civic
Contents |
that specific trouble code. If your car's check engine light is on, get that code read in case it's a P0420. A P0420 code is a trouble code on OBD-II equipped vehicles. All vehicles from 1996-newer sold in code p0420 honda civic 2000 North America support this generic powertrain code. This code is a pretty common one and code p0420 honda civic 2001 this site is here to help the average do-it-yourself (DIY) car owner (like you) troubleshoot, diagnose, and fix their vehicle themselves when presented code p0420 honda civic 1999 with a P0420 code, saving money. If your car has multiple trouble codes (DTC's), it's always a good idea to fix them in the order they come up on the code reader. For example, if you have these
Code P0420 Honda Civic 2002
codes - P0300, P0420, P0171, then you're going to want to tackle the P0300 Random Misfire code first (resolve it), and then tackle the P0420 code, etc. The reason for that is that the first code could be causing further DTCs to be set. If you've come to this site you most likely already know that you have a P0420 code. To start, we strongly recommend you seek the services of a professional mechanic/technician if you have p0420 honda civic 1998 any doubts as to whether you can perform the repair! Also, be sure to follow proper diagnostic procedures to determine whether a part has failed. If you simply change parts hoping it will solve the problem, you're really just guessing and wasting money. This site is here for information purposes only and is meant to help you learn more about the dtc and decide if you can tackle the repair yourself. It is not intended as car repair advice. OK, so what does a P0420 code mean anyway? As mentioned above, the code's description is Catalyst System Efficiency Below Threshold (Bank 1). OK, now tell me that again in plain English please.... let's break it down: the catalyst system being referred to is your three-way catalytic converter; so the catalytic converter is not working properly (i.e. it's not efficient). Bank 1 refers to the side of the engine which contains cylinder #1. On inline engines such as 4 & 5 cylinder engines, there is only one bank. So, to really simply things let's just say that the efficiency of the catalytic converter and/or exhaust pipe and/or O2 sensor is not so great. There are no symptoms so why should I fix it? Great question! A P0420 code will cause no symptoms aside from the MIL (malfunction indicator light) will illuminate. The reality is there is still something wro
& CR-VHonda Accord (1990 - 2002)Honda Civic (2016 - Current)Honda Civic (2006 - 2015)Honda Civic (2001 - 2005)Honda Civic / Del Sol (1992 p0420 honda civic 2006 - 2000)Honda CRX / EF Civic (1988 - 1991)Honda S2000Honda PreludeAcura RSX
P0420 Honda Civic 2004
DC5 & Honda Civic EP3Acura IntegraAcura Integra Type-RAcura TSXAcura NSXAcura TL, RL & ZDXHonda FitHonda MotorcyclesOdyssey | Ridgeline
P0420 Honda Civic Hybrid 2003
| MDX | Pilot | RDX | HR-VClassic HondasHonda Ruckus and ScootersHonda and Acura Technical ForumsRoad Racing / Autocross & Time AttackDrag RacingTech / MiscSuspension & BrakesForced InductionEngine Machining http://www.p0420.com/ & AssemblyWelding / FabricationAll Motor / Naturally AspiratedK SeriesHybrid / Engine SwapsAudio / Security / VideoWheel and TirePaint and BodyLightingEngine Management and TuningTransmission & DrivetrainHonda-Tech MarketplaceFor SaleWant to BuyClassifieds: Forced InductionVehicles for saleMotorcyclesWheelsSales FeedbackRegional ClassifiedsNorthern California (Sales)Southern California (Sales)Florida (Sales)Texas -OK -LA (Sales)Northwest (Sales)Southwest (Sales)Mid-West (Sales)Mid-Atlantic (Sales)Northeast (Sales)Southeast (Sales)Canada (Sales)Hawaii (Sales)Free StuffSponsor MarketplacePerformanceMiscellaneous - Appearance - LightingWheels, Tires, http://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/code-p0420-mechanic-says-2169238/ Brakes, and SuspensionForced InductionHonda and Acura Appearance / Cosmetic ForumsHonda / AcuraOther Make VehiclesAppearance Build ThreadsGroup ThreadsDetailingCommunity ForumsGeneral Discussion and DebateNewsletter ArchiveRegional Forums and MeetsNorthern CaliforniaSouthern CaliforniaHawaii & Asia-PacificMid-AtlanticMidwestNortheastNorthwestSouthSouthwestSoutheastCanadaUK and Europe Regional Gallery Tools Tire Rim Calculator Vin Decoder Live Feed Marketplace Vendor Directory Become a Vendor Site Store New Posts How-Tos All All Threads Posts Advanced Honda-Tech > Honda and Acura Model-Specific Technical Forums > Honda Civic / Del Sol (1992 - 2000) > Code P0420 : Mechanic says: Log In Log In Username Remember Me? Password Register Forgot Password? Register FAQ Community Calendar Today's Posts Search Vendor DirectoryCarsvBLive Community Links Pictures & Albums Members List Search Forums Show Threads Show Posts Search in Thread Titles Only Tag Search Advanced Search Go to Page... Code P0420 : Mechanic says: LinkBack Thread Tools Search this Thread 12-06-2007, 08:49 AM #1 seriot Junior Member Thread Starter Join Date: Dec 2006 Location: york, pa, usa Posts: 38 Code P0420 : Mechanic says: 1998 civic lx 104,000 miles
(DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the https://www.obd-codes.com/p0420 model. So this engine code article applies to Nissan, Toyota, Chevrolet, Ford, Honda, GMC, etc. The catalytic converter is a part of the exhaust system that looks kind of like a muffler, although it's job is very different from that of a muffler. A catalytic converter's job is to reduce emmissions from the exhaust. The catalytic converter has an oxygen sensor in front and behind p0420 honda it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be p0420 honda civic (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail. Symptoms The main symptom to the driver is the illumination of the MIL (malfunction indicator lamp). You will likely not notice any drivability problems, although there may be symptoms. For example, if the substance inside the catalytic converter is broken or failed, it may be restricting the exhaust which will result in a feeling of reduced power output from the vehicle. Causes A code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for A damaged or failed oxygen sensor (HO2S) Downstream oxygen sensor (HO2S) wiring damaged or connected improperly The engine coolant temperature sensor is not working properly Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe Retarded spark timing The oxygen sensors in front and behind the converter are reporting too similar of readings Leaking fuel injector or high fuel pressure Cylinder misfire Oil contamination Possible Solutions S