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Re: Fault Codes 5-2-1 and 2-1-2 850 1994

posted by  someone claiming to be Steve Seekins on  Fri Dec 11 11:02 CST 1998 [RELATED]

I assume that these codes are for connector A, with the test wire in socket #2 (A2).

5-2-1 = Heated Oxygen sensor heating faulty

2-1-2 = Heated Oxygen Sensor signal absent or faulty.

Make sure that your O2 sensor is plugged in. If so, it appears to need replacement.






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