Alan Casey wrote:
>
> Last night my engine started cutting out and the check engine light came on.
> I checked the error code and I got 12,21 and 55. Anyone know what those
> mean? I need to get a shop manual, but right now I would rather spend the
> money on whats causing the problem..
> Thanks..
>
> Alan Casey 94 SLT, V8, 5spd, MP Computer, Flowmaster exhaust.
Well, from the handy URL
http://www.sky.net/~boballen/dakota/OBD2.HTM
12 means you disconnected the battery lately.
21 means your O2 sensor died.
55 means the diagnostic test completed successfully.
There you, go drop $30 on a new O2 sensor and send me a
12 pack of Coors light for that thorough analysis.
Bob Allen, Kansas City, 96 RC/SB, 2WD, V8 Auto
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