2001 Toyota Tundra Code P0420

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.

2001 toyota tundra code p0420. 2 Apr 9 2011. P0420 Toyota Description. The cats and airfuel sensors still have 200k miles on them so I expect to have.

Ive driven about 200 miles with no codes no pending codes and no issues reported in mode 6. 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. Catalyst System Efficiency Below Threshold.

The P0420 code is set when the Catalyst monitor sees a decrease in voltage from the rear Monitoring Oxygen Sensors and an increase in switching activityfrom rich to lean to rich etcthat closely resembles the front Oxygen Sensors during the time the computer is activating the Catalytic Converter monitor test. Replacing the oxygen O2 sensors may sometimes fix the code but in most cases the catalytic convert needs to be replaced to fix the. On my tundra the P0420 was caused by a bad downstream O2 sensor.

Oxygen Sensor The P0420 codes is thrown when the oxygen sensors on both sides of the exhaust have very similar. A very common trouble code with the Toyota Tundrais the P0446 code. Code P0420 indicates that the catalytic converter is not functioning efficiently therefore increasing the output of harmful pollutants by your Toyota.

Service Engine Light Often this is the only symptom of the Toyota Solara P0420 code. If you are getting a P0420 error code and only the P0420 repeatedly then you likely have one of the following problems. I had the same issue on an 2004 OEM Toyota cats are the best and most expensive although the second choice would be Magnaflow which seem to work for most peepsstay away from the Universal types cats that are welded on they creat more problems.

Replacing both downstream O2 sensors eliminated the P0420P0430 codes. Leaded fuel in the system. 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.