Colorado multiple 02 sensor codes

08-28-2009, 07:34 AM
Very recently my 2004 Colorado started running rough. I soon discovered a check engine light and plugged in my OBD reader. I came up with P0030, P0036, P0135, & P0141 codes. All codes are telling me BOTH my O2 sensors and sensor heater circuits are no good. I'm having a hard time believing both sensors would go bad at the same time. Resets haven't worked. Any experience or advice (otherthan taking the truck to a dealership), would be greatly appreciated.

08-28-2009, 08:24 AM
Get a good wiring diagram. They have a years subscription for around $29.00 I would check for power to the sensor heater.

08-29-2009, 05:00 PM
Rhandwor, many thanks and my appreciation for your suggestion. In my initial investigation, I had inadvertantly put the 02 heater voltage fuse back in the wrong slot, so of course it never would have worked. I went to, bought a subscription, and started at the beginning (meaning the fuse block), and found the problem. Thanks again, I'm sure your help saved me a LOT of $$$, and a few headaches!


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