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02 sensor

  1. MKV GTI
    I have a 07 GTI and it has 87,000 miles on it. I put a cold air intake in it about a month ago and everything has been running fine. The light came on today as I was driving and so I took it to autozone to diagnose the problem. The codes that came on the reader were P0171 and P0507 Both came...
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