* If you disconnected the battery: The car's computer systems will likely relearn parameters over time. This can take several drive cycles (start, run, and turn off the engine). This is normal and usually not a problem. Driving the car for a day or two usually resolves any minor issues.
* If you replaced a sensor or component: Some sensors need to be re-calibrated or adapted by the PCM. This process often happens automatically as the car runs, but some may require a specific procedure using a scan tool. A professional mechanic with an OBD-II scan tool can help with this. Simply disconnecting and reconnecting the battery *may* help, but it's not guaranteed.
* If you're experiencing problems *after* servicing: The most likely explanation is you haven't fully connected something properly or a component may be faulty. Double-check all your connections, ensuring everything is seated firmly. Check fuses related to what you were working on.
* Check engine light: If the check engine light is illuminated, the car's computer has recorded a diagnostic trouble code (DTC). You will need an OBD-II scanner to read this code. This is crucial for diagnosing the actual problem. Auto parts stores often offer free code reading services.
In short: There's no magical reset button. The best course of action is to:
1. Double-check your work: Make sure everything is properly reconnected and tightened.
2. Drive the car: The computer will typically relearn parameters after a few drive cycles.
3. Check for error codes: Use an OBD-II scanner to check for any DTCs (diagnostic trouble codes).
4. Consult a repair manual: A repair manual specific to your 1996 Cadillac DeVille will offer more detailed information on system resets (if any exist) and troubleshooting procedures for different components.
5. Seek professional help: If you're still experiencing problems, it's best to consult a qualified mechanic.
Ignoring a check engine light or persistent problems can lead to further damage, so addressing the underlying issue is crucial.
