You havn't by chance gotten ahold of leaded fuel by chance that can cause this issue as well. The p0420 is you driver side 02 sensor/ catalytic converter (bank 1) You can also google the trouble codes and get a generic idea of what the codes are pertaining to. If the 02 sensors check out and theres no exhaust leaks then you'll need to replace the catalytic converters. If no exhaust leaks are present check the voltage readings of the 02 sensors to make sure there functioning properly. with the engin running and the hood up listen for ticking noises comeing from the left of right side of the engine. It could be the catalytic converters, however if theres any exhaust leaks from your manifolds before the catalytic converters this will cause a faulty reading as well.Ĭheck for exhaust leaks first. The O2 sensor on bank one up stream is reading the same as the 02 sensor down stream which is telling the computer that the catalytic converter isnt working properly. The codes are indicating that you have insufficient O2 sensor readings.
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