2001 Toyota Tundra Code P0420

This trouble code references a number that is given to you when you plug your Tundra into a OBDII scanner.

2001 toyota tundra code p0420. If you search the GEN1 forum under cats you will find a lot of infos on the subject. The only true way to tell if it is a bad cat would be to smog the truck. Most of the time it indicates that the catalytic converter is not working how it should.

This code indicates a misreading of Oxygen levels in the down. In this video we work on solving a P0420 diagnostic code being thrown in a 1999 Toyota Tacoma. Replacing the oxygen O2 sensors may sometimes fix the code but in most cases the catalytic convert needs to be replaced to fix the.

Scrape the sensor mounting flange thoroughly removing all traces of scale and of the old gasket and reinstall the old sensor with a new gasket and with M8-125 stainless nuts and lock washers. The code P0420 set due to the Catalyst Efficiency reading being below Normal Bank 1 and in most cases if this is the only code your getting the fix requires replacing the Bank one Catalytic converter. There are many things that can cause the P0420 trouble code in your Solara.

The P0420 CODE IS INSUFFICIENT CATALYTIC FLOW FIRST CHECK OTHER SENSORS BEFORE REPLACING THE CATALYTIC CONVERTOR CHECK YOU REAR OXYGEN SENSOR TO MAKE SURE IT IS WORKING FINE THEN CHECK YOUR EGR VALVE MAKE SURE IT IS NOT LEAKING CHECK YOU MASS AIR FLOW METER IF IT HAS ONE OR AIR FUEL RATIO SENSOR THIS WILL BE THE TOP OXYGEN SENSOR. I reset the code and it stayed off for a while. Rotten egg or sulfur smell.

Catalyst System Efficiency Below Threshold. A very common trouble code with the Toyota Tundrais the P0446 code. Leak in exhaust system.

A three way catalyst converter Manifold with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. Error code P0420 - or Catalyst System Efficiency Below Threshold Bank 1 - is one of several trouble codes that fall into the general exhaust system code block. On my tundra the P0420 was caused by a bad downstream O2 sensor.