New answers tagged p0420
2
The upstream O2 sensor should rapidly change between 0 and 0.5 volts. The downstream should hover at about 0.5V constantly.
I have seen this issue with a relative's 2009 Fit Sport. Unless you live somewhere very anal about emissions testing, I wouldn't worry too much about it. Now, if the catalytic converter were to clog (and cause a poor running condition ...
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