Rough idle?

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Bilyzoom - 18 Jul 2007 04:43 GMT

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.

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Ray O - 18 Jul 2007 05:44 GMT

> 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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Ray O
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