The flashing of the check engine light *might* offer a clue in some very limited cases, but it's not reliable for identifying the specific problem. A flashing light usually signifies a severe misfire condition that could damage your engine.
Attempting to reset the light without addressing the underlying problem is strongly discouraged. This will simply mask the issue, potentially leading to further damage and more costly repairs later.
What you *can* do:
* Observe the light's behavior: Is it flashing or steadily on? A flashing light indicates a more serious issue that needs immediate attention. Note any other symptoms like loss of power, rough running, or unusual sounds.
* Research common problems: Based on the symptoms and your Jeep's mileage, you could try searching online for common issues associated with 1999 Jeep Wrangler Sport engine lights. This will only give you potential causes, not a definitive diagnosis.
* Consult a repair manual: A repair manual specific to your vehicle can sometimes provide basic troubleshooting steps and possible causes for common engine light problems.
* Get a diagnostic scan: The best and most reliable way to identify the problem is to use an OBD-II code reader. These are relatively inexpensive and readily available at most auto parts stores. The reader will display the trouble code(s), allowing you or a mechanic to identify and fix the root cause. Then, the code can be cleared properly, turning off the light.
In short: While some DIY methods exist for *very* old vehicles, it's impractical and unreliable for your 1999 Jeep Wrangler. Get a code reader. Trying to reset the light without understanding why it's on will only delay proper repair and possibly cause greater damage.
