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+--- Thread: CM871 complete EGR tune-up now CEL 1866 (/showthread.php?tid=7552)
RE: CM871 complete EGR tune-up now CEL 1866 - Lead_sled - 07-18-2021
If you didn’t have codes before, try putting the old sensors on one by one to see if your light goes away. I recently did this and found that my imap sensor was bad, although new.