2004 Chevy Truck O2 sensors

Tiny
BRAD1683
  • MEMBER
  • 2004 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
Computer codes po135 and po141 heater circuit not working. Where do I start checking for this problem? Both sensors are bosch and are brand new.
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Tuesday, April 22nd, 2008 AT 7:09 PM

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Tiny
BMRFIXIT
  • EXPERT
Fuses and relays
check the wiring harness
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Sunday, April 27th, 2008 AT 6:31 PM

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