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.
Replace Oxygen Sensor When Servicing EGR System on Toyota 4Runner
Average mileage: 354,657 (354,657–354,657)
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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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where is the oxygen sensor located and how hard is it to replace?
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