Re: P1135 code - 1999 4Runner
It is most likely the air fuel ratio sensor. Get the sensor from Toyota, and not an aftermarket part. Either your local dealer or an online dealer will have the part. Your dealer will sell the part for about $200, you can get one on line for about $145. It isn't a bad idea to get a gasket and new hardware as well. It is a pretty simple fix. Two nuts and a connector. If you are paying someone to do it, it shouldn't be more than a half hour of labor. It shouldn't cost you more than $300 to pay someone to replace it.
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