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- - Engine Check Light (https://www.mazda3club.com/3rd-gen-engine-drivetrain-57/engine-check-light-19389/)

mesx7828

January-24th-2003 05:17 PM

Engine Check Light

Can anyone help me, I got a engine check light. went to autozone and had the code check. Got a Code:

P0421
warm-up Calalyst efficiency below threshold (bank 1)

Can anyone help me, with this? Can i fix it myself. Mazda dealer no help.

TheMAN

January-24th-2003 05:24 PM

check for exhaust leaks

if that is fine then any of the two O2 sensors are bad

mesx7828

January-24th-2003 06:03 PM

when you say exhaust you mean muffler? And if its not the exhaust and 02 sensor is it hard to replace myself?

midnightblue97

January-24th-2003 06:14 PM

Quote:

Originally posted by mesx7828
when you say exhaust you mean muffler? And if its not the exhaust and 02 sensor is it hard to replace myself?

He probably means anywhere from exhaust manifold to tailpipe.

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