Check engine light code P0421?What the hell *update* - Mazda3 Forums : The #1 Mazda 3 Forum


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Old 07-10-2010, 07:31 PM   #1
djv154
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Default Check engine light code P0421?What the hell *update*

I dont know how this happened, just came on today. What the hell does it mean, thanks for all your help.
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Old 07-10-2010, 09:56 PM   #2
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Default Re: Check engine light code P0421?What the hell

A quick Google shows that P0421 is exhaust-related; most people say to check your O2 sensors or cat.
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Old 07-11-2010, 01:43 AM   #3
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Default Re: Check engine light code P0421?What the hell

i think it's the first O2 sensor. that or the flux capacitor is going bad.
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Old 07-12-2010, 03:08 PM   #4
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Default Re: Check engine light code P0421?What the hell

Just wondering I have a hole in my catalitic converter so for the time being I was going to take it out. I'm in FL right now so i'm going to be driving up to NJ within 2 weeks or so. Should I just keep the hole that is in my catalitic converter or just get a straight pipe for the time being while I'm in FL. Then when I get to NJ I could find a catalitic converter because I know in NJ you need one. Plus I'm going to have to deal with the CEL after I take out the catalitic converter is that right? Is there away to remove the CEL. I have an 04 mazda 3 hatch. thanks alot
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Old 07-12-2010, 03:22 PM   #5
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Default Re: Check engine light code P0421?What the hell *update*

i have a 2005 and removed my Catalytic converter with no issue. no cel nothing. the 2nd CAT not the 1st...
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