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P1621 Diagnostic Trouble Code Discussion for June 2007

Control Module Long Term Memory Performance

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Trouble Ticket Help Requests for DTC P1621
Help Request Posted
2001 Mazda Miata 1.8L No Start, MIL Lamp on VIN: JM1NB35371
P1621: Key Identification Number Not Registered In The PCM. Hello and thanks ahead of time. This 2001 Miata is a flood car that someone else brought back to life. It has been running about a year, then it quit running. I couldn't communicate with my OTC Genisys. I had to repair some butchered wires. I got a used ECU an...
June 26, 2007