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If you still cannot find your issue, I recommend you take it to a shop that specializes in Asian makes that has a Toyota specialist… They can probably find the issue in less than an hour…
Not trying to insult you, but P0171’s are not usually that hard to fix on a Corolla, and even easier on the 98 and 99 because they were non-vvt and had no MAF sensor.
-Karl
Sorry guys, I have not done squad. Smog is due in January. Got to find some time to fix it. I know it’s probably something easy. There’s no vacuum leak. I suspect the O2 sensor. I need to get my hands on a scanner to check the switching data on the sensor. Does the upstream goes out more often than the downstream one?
Thanks.So I bought the Denso O2 sensor from Rock Auto, replaced bank 1 and the check engine light is back again. What is the next step? No exhaust nor vacuum leak that I could see. I guess only fuel injector and Fuel filter/pump in the gas tank.
My wife took the car to a mechanic and he said for $350 he could fix the code with something call fuel pressure relay. I wonder if he means fuel pressure regulator?
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