U4121 code? Any info?
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Joined: Nov 2024
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From: clovis CA
U4121 code? Any info?
So my 2010 Mazda 3 is throwing this code. I can’t seem to find any info about it other than it may be something to do with a loose harness or connection? Won’t pass smog until I can get that code to fix. Any suggestions are appreciated.
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