Replace Oxygen Sensor When Servicing EGR System on Toyota 4Runner

Over the time the exhaust gas recirculation (EGR) system may become plugged with debris, the oxygen sensor may also be getting slow or 'lazy' around this time. When servicing or cleaning  the EGR system, it is a good idea to replace the oxygen sensor because it works in tandem with the EGR system.

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Average mileage: (–)
8 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997
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