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 MR2
Average mileage: 145,000 (145,000–145,000)
6 people reported this problem
1993 Toyota MR2 145,000 mi, Visitor
O2 sensor went bad