Replace knock sensor harness when replacing head gasket on Toyota 4Runner

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.

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Average mileage: (–)
6 model years affected: 1990, 1991, 1992, 1993, more1994, 1995
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