2002 CHEVROLET BLAZER OXYGEN SENSOR

  • Tiny
  • uhrich
  • 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

Thursday, March 13th, 2014 AT 6:06 PM

1 Answer

  • Tiny
  • hmac300
  • Expert
  • 42,151 posts

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.

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Friday, March 14th, 2014 AT 7:14 AM

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