Mechanics

OXYGEN SENSOR

2002 Chevrolet Blazer • 4.3L V6 RWD Automatic • 110,000 miles

I have a p0420 code and my downstream oxygen sensor is not acting like upstream sensors but when I rev engine about 2000 rpms it is at 0.1 volts and maybe up and down a little then it jumps up to 0.8 - 0.9 volts for a bit then back down is this a bad oxygen sensor or what does it mean
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Uhrich
March 13, 2014.




Code p420 may be a converter have a pro diagnose this as it can be an air leak besides measurements aretaken in millivolts and either sensor will cause a code.

Hmac300
Mar 14, 2014.


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