2004 Chevy Truck o2 sensors

2004 CHEVROLET TRUCK
115,000 MILES • V8 • 4WD • AUTOMATIC
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BRAD1683
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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
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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