1999 toyota 4-runner has check engine light with a code of p1135 and need to know how to fix this.thanks
This is a code that is indicating you have a problem with the "bank 1, O2 sensor 1" heater circuit. Bank one is the side of the engine that has cylinder #1, and sensor #1 is the O2 sensor on that side that is before the catalytic converter. This code sets when the computer senses that it either takes too much or too little current to drive the heater inside the O2 sensor. Typically, most shops would simply put a new O2 sensor in this location as it is ten years old and there is a good chance that the O2 sensor has burnt out However, there is a possibility that the driver circuitry has a problem as well.
I would replace the sensor, I believe it is the one on the passenger side between the engine and the cat. After that, you will have to drive it a bit for the code to cancel, or you could have it reset with a scan tool.
Thank you
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