I have an '04 GMC Sonoma 4.3 VIN X with 76,000 miles. Mileage went down so tuned up and changed O2 sensors with Bosch #13193 sensors ( All 3 The Same ). After doing so, cranked and got PO141, PO135, & PO155 Codes.
All codes are related to heater of O2. Took the one off post Cat and exchanged for another one, installed and same result. Took car to machanic, he installed a Delco sensor to test and no problem. Seems silly to spent $170 per sensor when Bosch should work. Anyone had this experience & if so what was the solution. The car runs great and can reset code after warms up and no problems. HELP would be appreciated.

Thanks in advance !!

Never had a problem with Bosch sensors, they should be covered by a warranty. $170 each is robery:

http://shop.advanceautoparts.com/productdetail.aspx?MfrCode=BOS&MfrPartNumber=13193&PartType=291&PTSet=A

http://www.autozone.com/R,1869818/vehicleId,2938901/initialAction,partProductDetail/store,2117/partType,00117/shopping/partProductDetail.htm