A bad O2 sensor will usually not cause a rough idle. As to the reason for the check engine light, you can take it to a place like Autozone where they will lend you a code reader. Scan the trouble codes and post the code here so we can try to help you out. More common causes for…
Read the full replyRecently had an engine light come on. Reset light by cycling battery power. After that the engine idled rough at stops, but after a while idle is OK. Air filter has been changed recently. Could this be a O'2 sensor going bad? Car is a 2002 GS300 with 113K.
Thanks for any help.
A bad O2 sensor will usually not cause a rough idle. As to the reason for the check engine light, you can take it to a place like Autozone where they will lend you a code reader. Scan the trouble codes and post the code here so we can try to help you out.
More common causes for rough idle are a fouled idle air control valve or mass air flow sensor.
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