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How do you reset service engine soon in a 1996 Oldsmobile ciera?

There's no single universal method to reset the "Service Engine Soon" light (SES) on a 1996 Oldsmobile Ciera. The method depends on whether the light came on due to a simple code that's been cleared (like a gas cap issue) or a more serious problem. Do not simply reset the light if you don't know why it came on. Ignoring a legitimate problem could lead to further damage.

Here are the options:

* OBD-II Scanner: While 1996 models are on the cusp of mandated OBD-II compliance, it's *possible* your Ciera has an OBD-II port (usually under the dashboard). If it does, you can use an OBD-II scanner (available at most auto parts stores) to read the diagnostic trouble codes (DTCs). The scanner will tell you *why* the light came on. Once you address the underlying problem, you can usually clear the code using the scanner. This is the BEST approach.

* Disconnecting the Battery: This is a last resort and *only* works if the SES light is on due to a minor, temporary issue, like a loose gas cap. This method will reset the computer's memory, but it won't fix the underlying problem.

1. Disconnect the negative (-) battery cable. Use a wrench to loosen the terminal.

2. Wait 10-15 minutes. This allows the car's computer to fully discharge.

3. Reconnect the negative cable.

4. Start the car. The SES light should initially come on, and then, *if the problem is truly resolved,* it should turn off after a few driving cycles.

Important Considerations:

* If the SES light comes back on soon after resetting, the problem hasn't been fixed. Take your car to a mechanic to diagnose the issue. Ignoring it can lead to costly repairs down the line.

* The "Check Engine" light (or "Service Engine Soon") is your car's way of telling you something is wrong. Don't just ignore it or repeatedly reset it hoping it goes away. Address the root cause.

Because your car is older, it's less likely to have a readily accessible OBD-II port. If you can't find one, get a professional diagnostic. A mechanic will have the tools to check for codes and diagnose the issue effectively.