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  1. P0641 Loss of 5V Reference/ Fuel Trim 3 30%

    Problems and Service
    Hi there.. I have been struggling with the code above on my 2010 Cobalt (about 70K miles). Initially, I replaced the MAF sensor, cleared the codes, and it ran fine for 350 miles or so, and then threw the same code. All the listed diagnostic tests come back OK, or N/A (assuming this means they...
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