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C1109-00 code - no CEL tho

Originally Posted by SouthArk370Z Yes. A lot of DTCs don't light up the CEL. Even if it is related to an engine problem. Depends on how severe the ECM thinks

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Old 11-17-2019, 09:32 PM   #5 (permalink)
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Originally Posted by SouthArk370Z View Post
Yes. A lot of DTCs don't light up the CEL. Even if it is related to an engine problem. Depends on how severe the ECM thinks the problem is.

ABS is not part of the engine. You may have a brake or other problem light that you didn't notice.


I probably have dirty MAFs as my car sometimes goes into limp mode when I first start her up with no cel light. Every few months, I will get the cel light and when I hook up my obd ii scanner, it gives me the MAF code, which I’ll clear out. So no, a cel light will not always come on.
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