How do you reset the oxygen sensor check engine light on a 91 dodge stealth?

You can't just "reset" a check engine light related to an oxygen sensor (or any other fault) on a 1991 Dodge Stealth (or any other OBD-I car) by simply pressing a button or following a simple procedure like in some newer cars. The check engine light is an indicator that a problem has been detected by the car's computer. Simply clearing the light without fixing the underlying issue will just cause it to come back on.

Here's what you need to do:

1. Identify the Problem: The check engine light is a symptom, not the problem itself. A faulty oxygen sensor can manifest in several ways: poor fuel economy, rough idling, hesitation during acceleration, or excessive emissions. You'll need to diagnose *why* the check engine light is on. A simple visual inspection of the oxygen sensor's wiring and connector for damage is a good first step.

2. Diagnostic Trouble Code (DTC): OBD-I systems don't have a standardized readout like OBD-II. To get a DTC code, you'll likely need a scan tool specifically designed for OBD-I vehicles, or you may be able to use a paperclip method (this varies by car make and model and is not guaranteed to work on a '91 Stealth). Research your specific year and model to see if this is possible. The DTC code will give you a much clearer indication of the problem.

3. Repair the Problem: Once you know what's wrong (e.g., a bad oxygen sensor, wiring issue, etc.), you need to fix it. This usually means replacing the faulty oxygen sensor (or other component) and potentially repairing any damaged wiring.

4. Clear the Code (After Repair): *After* you've made the repair, you can clear the code. On some OBD-I systems, disconnecting the battery's negative terminal for a period of time (e.g., 30 minutes) will often reset the computer. Again, this is not guaranteed to work on a '91 Stealth, and you should research the proper procedure. Some OBD-I scanners will allow for code clearing.

Important Considerations:

* OBD-I Limitations: OBD-I systems are significantly less sophisticated than modern OBD-II systems. Diagnosing problems can be more challenging and often requires a good understanding of automotive systems.

* Professional Help: If you're not comfortable working on your car's electrical system or you can't find the problem, it's best to take your Dodge Stealth to a qualified mechanic. Improper repairs can lead to further damage.

In short: Don't focus on resetting the light. Focus on fixing the underlying cause of the check engine light, then the light will go off on its own after the computer detects the problem has been resolved.