2004 Chevy Truck o2 sensors

2004 CHEVROLET TRUCK
115,000 MILES • V8 • 4WD • AUTOMATIC
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BRAD1683
  • MEMBER
  • 1 POST
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.
Apr 22, 2008 at 7:09 PM
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BMRFIXIT
  • ✓ASE Certified Mechanic
  • 19,053 POSTS
  • ASE Certified Mechanic
fuses and relays
check the wiring harness
Apr 27, 2008 at 6:31 PM
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