I agree with emissionwiz, there are tons of reasons. My best guess would be an oxygen sensor. My opinion is that these are most likely to go bad. They only last around 100,000 miles on a car. On a 97 though, they should be able to pin point which sensor is giving you the code. Take it back to them, or try a different store such as Advance Auto and see if they can give you a better code. You should have a P00000 code from them with the OBDII diagnostic system that your vehicle has!
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Possible causes are these so you need to get the vehicle top a competent mechanic to locate the cause in your case.............
- Faulty Evaporative Emission System Pressure Sensor
- Evaporative Emission System Pressure sensor harness is open or shorted
- Evaporative Emission System Pressure sensor circuit has a poor electrical connection
- Faulty Engine Control Module (ECM)
The "check engine light" on a vehicle is a generic indicator that some comportment or part of the vehicle is faulty. It could be any one of several components associated with ignition, fuel delivery, emissions, etc. Something as simple as a loose gas cap can trigger a "check engine light" to come on. The vehicle should be scanned with a OBDII scanner to better pin point where the problem is. The scanner will read the vehicle's fault codes, which will indicate what component or what part of the vehicle is not working correctly. I believe places such as Auto Zone or Advance Auto will do a scan for little to no cost. Be aware that these fault codes are general indicators, so before you start replacing parts, it is best to have the vehicle scanned with comprehensive diagnostic equipment to pin point the problem. Those diagnostics are performed by a certified mechanics shop.
hi you can try disconnection the battery , wait 5 minutes them reconnect. also you can check with auto zone , they do free diagnostic check through the obd2 connector. this may aid in pin pointing the problem
Yes, worth changing the air filter. Had the same problem recently and that cured it (are your having hesitation at startup, by any chance?). If not, could be the oxygen sensors. It's worth dealing with this sooner rather than later -- it's probably decreasing your mileage.