Question about 1997 Chrysler Concorde

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What do codes 12 21 55 mean on 1997 chrysler concorde

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DTC 12 - Battery or power line recently disconnected - This code is normal if the electrical system has been worked on or the battery has recently been disconnected. It will be removed after 15 ignition switch on/off cycles.


DTC 21 - Oxygen Sensor
Bad connection or wiring - Check the wiring and connections between the sensor and the logic module (or SMEC). Clean and regrease any corroded connectors with dielectric grease and repair any shorts. Look for melted wire insulation near the exhaust manifold. An open connection will cause this fault code.
Bad oxygen sensor - Replace the sensor which is located on the turbo housing near the down pipe (for turbo) or on the down pipe near the exhaust manifold.

Diagnostic Method - Trigger Parameters
- In closed-loop for 718 seconds (11 minutes, 58 seconds)
- Sensor output stays in the neutral region for more than 21 seconds

Results If Component Fails
A fault code 21 is stored. The circuit stays in closed-loop and the logic module will still monitor the oxygen sensor signal and allow the engine to run rich, but prevent it from running lean.


DTC 55 - No further fault codes are stored.

If this is the only code received, then there are no codes stored in memory. This code will always be given, even if nothing is wrong. If you do not get this code, then you may not be retreiving the codes properly, or the power loss light may be burnt out. The light should come on for 1 second when the ignition is initally turned on as a bulb test.


Really, the main problem that you have there is the O2 sensor, its possible that you need to replace it to solve your problem.

Hope this helps (remember to rating this answer and leave us a testimonial comment).

Posted on Oct 13, 2011

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