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O2 Sensor

Tiny
KANTRIM
  • MEMBER
  • 2005 CHEVROLET AVALANCHE
  • 7.1L
  • V8
  • 4WD
  • AUTOMATIC
  • 212,228 MILES
Fixed all O2 sensors and converters and my check engine light is still reading bad sensors. Could it be the wires or maybe a bad computer? I need to pass emissions! Help please
Thursday, March 24th, 2016 AT 4:47 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
What is code? If a 420 check for a n air leak in exhaust system prior to converter. If not send us the code.
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Friday, March 25th, 2016 AT 7:18 AM
Tiny
KANTRIM
  • MEMBER
  • 2 POSTS
I dont know I would have to ask mechanic. Its the code saying O2 sensors are bad. Thats all I know
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Friday, March 25th, 2016 AT 12:05 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Ok auto parts can scan for that usually for free. However I see you have a 8.2 big block in this vehicle. They used to loosen the intake bolts from running so try tightening them up first. Tighten them starting with second series, arrows show. Also in sequence shown. See pics this may cause the O2 sensor problem as it may be lean. However you'll need to use a scanner to erase the code.S
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Friday, March 25th, 2016 AT 1:13 PM

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