Replace oxygen sensor when cleaning EGR system on Toyota Avalon

By the time the EGR system is plugged, the Oxygen Sensor is getting slow or 'lazy'. 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: (–)
3 model years affected: 1995, 1996, 1997
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