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Originally Posted by Grovsnus
Granted, the engine codes are most likely those that can be triggered, but that's just a subset of the DME codes for the vehicle. Sure, you're unlikely to get a code thrown for your gas lid or license plate light because of a mod, but how about the performance control, for example? Or "Service Request" code in BMW Assist?
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Not sure what you're saying here, the JB4 can clear all codes, not just "engine" codes. I've personally done so.
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And do you really want to clear all codes, including the ones that are problems? "Miss Mechanic, I have this problem that comes and goes with [...], can you take a look at it?" "Sure - let me check... No, everything looks good from here."
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In my situation, I simply removed the JB4, drove for a few miles to make the code come back, and then took it in since I knew it wasn't mod related. Worked perfectly.