Administrator Posted May 23, 2009 Share Posted May 23, 2009 P01421 does not exist. A P-code has a P and 4 digits, not 5.If you made a typing error and meant P0421 that's definitely Catalyst defective.Code description here: www.dtcsearch.comUsually this code means that the catalyst is defective.However, there's always a small chance this is caused because an Oxygen sensor sends a false signal.This can happen when the exhaust is leak between the catalyst and this Oxygen sensor. Lees meer... Quote Link to comment Share on other sites More sharing options...
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