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Oxygen sensor heater 200 1989

posted by  CoolVolvo on  Fri Feb 25 15:51 CST 2022
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last visit: Tue Jul 29 10:53 CST 2014
[RELATED]

I will try to check some of the connections as well as Fuse#4.
The O2 Sensor heater wires are intriguing...It could explain why the Check Engine light stays off during cold weather.
Today I drove the car at least 15 miles in 40 deg. weather, and the light never came on.
This issue usually happens when the outdoor temp is closer to 50 deg.






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