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Old 07-06-2010, 09:59 AM   #1
Razzor19
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Default Service Engine Light P0421

I just received and Engine Code P0421 yesterday and not sure what could cause this code. Does anybody have a an idea what could this code? I have replaced one of the 4 O2 sensors ans thermostat ans spark plugs at 100,000 miles. I know have 132,000 on the car. 2002 L300.

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Old 07-06-2010, 10:23 AM   #2
s3nfo
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2001 L-Series 3.0L Wagon
Default Re: Service Engine Light P0421

P0421, Catalyst Bank 1
Worn out Catalytic Converter, bad downstream O2 Sensor, possible bad upstream O2 Sensor triggering erronous readings.

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