What are the indications of a failed O2 sensor??
Captain
O2 Sensor
Dec 05, 2003
2 Replies
The Check Engine warning light will be on. Your engine will function properly, but you won't pass that smog check...
If the Check Engine light is on, go to AutoZone and have them read the failure code stored in your OBD system.
--Dan
Check engine light on.
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