What year car??? If 96 or newer it needs to be reset using SDS or another compatible scanner. OBDii scanners or disconnecting the batt wont erase codes from that module.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)