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What is code p0420 p mean - 2004 Nissan Maxima

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What means catalyst Efficiency below normal


      Got it scanned and it's P0420: Catalyst efficiency below thresholdbank 1. They said it could be a bad catalytic converter or oxygen sensor. I borrowed a scanner and tried to measure the oxygen sensor readings over time.Sep 8, 2011

      civic - Check Engine code P0420 Catalyst efficiency below ...

      mechanics.stackexchange.com/.../check-engine-code-p0420-catalyst-efficie...
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    P0420 Error Code: Catalyst System Efficiency Below ...

    www.obd-codes.com/p0420
    P0420 OBD-II Trouble Code. Technical Description. Catalyst System Efficiency Below Threshold (Bank 1). What does that mean? This diagnostic trouble code ...

    P0420 Code Fix How Its Done Catalyst Efficiency Below ...

    ? 4:25
    https://www.youtube.com/watch?v=-c8090n1Ihs
    Jun 20, 2014 - Uploaded by ACE AUTOS UK
    Here is a tutorial on P0420 code fix catalyst efficiency below threshold How To Diagnose a p0420 code ...

Jan 26, 2016 | Cars & Trucks

2 Answers

What does p0420 code mean !


http://www.obd-codes.com/p0420

Here we are again. I'm ba-a-ack! You have a catalytic converter that is below threshold efficiency. This may be related to the random multiple cylinder misfire you had asked about earlier.

Jun 02, 2014 | Cars & Trucks

1 Answer

Trouble code p0420


The P0420 code means that the catalytic converter efficiency is below threshold. Since there are two oxygen sensors, above and after the catalytic converter, they together generate signals which are used to monitor the efficiency. However, if the catalytic converter is bad, the sensor after the converter will generate steady results, without any fluctuations.
You can replace the catalytic converter to overcome this problem. However, there are chances of the P0420 code to come up if there is any leak in the exhaust or the downstream o2 sensor (after the converter) is bad. Ideally, before spending on cat, you should try replacing the downstream sensor, which you can buy at low price from online stores like oxygensensorworld.com and also inspect for any small leaks in the exhaust system. Since the converter can cost you more, think of replacing it only if needed.

May 23, 2013 | Cars & Trucks

1 Answer

CODE P1870,P0420


P1870 generally means that the transmission is slipping. P0420 relates to an issue with a vehicles catalytic converter. To know specifically what each code is, as it relates to your vehicle, you should take it to a local auto-part store (like AutoZone and have them pull the codes off of your vehicle. At auto part stores, they generally do this service for free and it is pretty quick. Regards ~ JD

Nov 28, 2012 | 2000 Pontiac Firebird

1 Answer

My check engine light is on, and the code is P0420, it's a Pontiac Grand Am. What does the code mean?


Go to Advance Auto. They have free troubleshooting of engine codes. The techs there can give you a list of causes for the code based on your automobile.

Dec 23, 2011 | 2003 Pontiac Grand Am

2 Answers

My 1999 Chev Tahoe will not start - Has codes p0430 and p0420


Hi Charlie,
Diagnostic Test Codes (DTCs) P0420 and P0430 ar "Catalyst Efficiency" codes. These simply mean that the catalytic converters in your vehicle are not performing the way they should be. To fix these codes, you will most likely have to replace the converters. However, these codes do NOT indicate why your engine wil not start. There are many things that can cause an engine to not start. Many of which may or may not set fault codes. You need to determine if the engine is getting fuel and ignition first then go from there.

Dec 17, 2011 | 1999 Chevrolet Silverado 1500

3 Answers

I had my car inspected and received P0420 code? what does it mean?


P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1) Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
www.obd-codes.com/p0420

Feb 18, 2010 | 2000 Toyota Celica

1 Answer

Code P0420 - what does that mean? The car is an


Code P0420 probable cause, 1. Secondary HO2S (Sensor 2) or 2.Three Way Catalytic converter.

Aug 15, 2009 | 1997 Honda Accord

1 Answer

What does the code P0420 means in a 2004 dodge intrepid


A code P0420 may mean that the O2 (oxygen sensor) has gone bad and needs to be replaced. This is not detrimental to the operation of your vehicle but could make you fail an emissions inspection if your state requires them

Aug 03, 2009 | 2004 Dodge Intrepid

1 Answer

Repair Codes - B2796, P0750 and P0420.


B2796 is no communication in Immobiliser system, which means you or some one else try to use a key transponder to start the car.
you need some one to clear that code. it doen't affect the car performance.
P0750 is shift Solenoid malfunction, you hsould have engine management light on the dash. this you can call the dealer, I believe this is cover by Toyota service bulletin.
http://www.mediafire.com/?jjmootmytfz
P0420 is O2 oxygen sensors.Toyota has issued a service bulletin regarding the P0420 trouble code that could apply to your vehicle, to be sure if this bulletin applies to your car I will need the VIN# and e-mail to tedrttr@yahoo.com with that information.

May 19, 2009 | 2002 Toyota Camry

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