Recently 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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