The 3.0 V6 engine is usually prone to leaks in the head gasket after as little as 60,000 miles. When the head gasket is replaced, the knock sensor harness should be replaced as well, as it can be damaged by leaky head gaskets, resulting in a serious decrease in fuel efficiency or in long term engine damage.
Replace knock sensor harness when replacing head gasket on Toyota 4Runner
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Check engine light was on so I had it hooked to an engine code analyzer and it indicated the throttle position sensor was the problem. Replaced the sensor with no improvement? Any suggestions?
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