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Originally Posted by comp_jas
Is that different than the code scanner that Advance Auto will loan you?
I borrow their scanner and read the codes. The only code set it Misfire Cylinder #5.
My car is a '97 also with a randomly set CEL.
The car definitely runs rough for a brief period of time the code is valid. But what is causing the code? Something changes in the operating conditions as the coolant gauge moves just above the C mark.
I thought plugged EGR ports might have merit. A slow responding auxiliary air valve or might also lean things out.
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Autozone, advance, kragen, etc have generic OBDII code readers. The subaru select monitor II is what they are currently using. SSMIII I hear is coming out real soon. I would say take it to the dealer they can let it sit overnight for a cold start.