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  1. CADILLAC P1621

P1621 / ROVER

Serial Data Link Dead Fault

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P1621 / MAZDA

lmmobilizer System Fault

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P1621 / JAGUAR

Control Module Long Term Memory Performance/ Immobilizer Code Words Do Not Match

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P1621 / GENERIC

Control Module Long Term Memory Performance/ Immobilizer Code Words Do Not Match

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P1621 / CHEVROLET

Control Module Long Term Memory Performance

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P1621 / BUICK

PCM Memory Performance

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P1621 / AUDI

Engine coolant temperature signal short to ground

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NOTE: Results from this database are the beginning of the diagnostic process, further investigation should be performed to confirm results before you begin repairs.