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What are check engine light codes 12 for a 1995 Dodge Avenger?

There is no single, universally accepted meaning for a "check engine light code 12" for a 1995 Dodge Avenger (or any OBDI vehicle for that matter). OBD-I systems (like those in 1995 vehicles) use a different diagnostic approach than the later OBD-II systems. A code 12 in this context usually indicates one of the following:

* Memory Test Complete: A code 12 often simply signifies that the computer's self-test has completed successfully. It's not an error code itself, but rather a confirmation that the system is functioning and has checked its internal memory.

* No Diagnostic Trouble Codes (DTCs) Stored: If no other codes are present, code 12 can mean the system found no problems during its self-test. In other words, everything looks okay.

* System Voltage Check: The system is checking the voltage in the electrical system.

To find out what's really going on, you need to use the proper diagnostic procedure for your 1995 Dodge Avenger's OBD-I system. This usually involves:

1. Connecting a scan tool: A scan tool specifically designed for OBD-I vehicles is necessary. Generic OBD-II scanners will *not* work.

2. Reading the codes: The scan tool will display any stored diagnostic trouble codes (DTCs). Code 12 alone, without other codes, generally suggests no other problems were found.

3. Consulting a repair manual: Your vehicle's repair manual will have a list of diagnostic trouble codes and their meanings. This is crucial for accurate interpretation.

If you only have a code 12 showing, and your car is running fine, it's likely nothing to worry about. It's just the system confirming its internal check. If you're experiencing problems, however, you'll need a proper OBD-I scanner and your vehicle's repair manual to diagnose the true cause.

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