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B0121 Diagnostic Trouble Code Discussion for September 2007

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Trouble Ticket Help Requests for DTC B0121
Help Request Posted
2000 Jaguar XJR 4.0L failsafe engine mode VIN: SAJDA15B9Y
B0121: No information. This is my first time using a WDS unit I bought used. The unit seems to work fine after some experimentation. The XJR has an intermittent problem where it loses power and displays Failsafe Engine Mode, TRAC Not Available, and ASC Not Available. Idle goes to ab...
September 13, 2007