CEL with code P0421. Its a failing Catalytic convertor

[Dk_krypton]

So I just got a CEL on my 2.5L Gen2 hatch and Mazda quoted me $1500 to replace the cat. I did a bit of research and found this https://www.carid.com/2010-mazda-3-e...-98136520.html


Curious if anyone's tried these out and if they help throw out some more power? Also, if anyone's selling a used headers+cat combo, hit me up?

[LinkinEffect]

In all honesty, its a cat. Any muffler man will throw in a universal for around $100. They don't really do anything special. Unless your looking sound specific, I don't see the sense in spending the money. Most out last the vehicle. Odd one fails.

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[Default User]

@dailydose

[Default User]

@Daileydose

[Daileydose]

I have the same problem,year, and model. I haven't fixed it but I would clean the O2 sensor first if that doesn't work get new ones. The cat shouldn't be going out at all.

[Daileydose]

In all honesty, its a cat. Any muffler man will throw in a universal for around $100. They don't really do anything special. Unless your looking sound specific, I don't see the sense in spending the money. Most out last the vehicle. Odd one fails.

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Cant cut the cat without effecting the exhaust manifold.

[LinkinEffect]

That's depressing because I personally need a new cat. Sigh.

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[Daileydose]

That's depressing because I personally need a new cat. Sigh.

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Your converter is cheaper to replace then the following year the most I've seen is 380 for a new one on rock auto.

[messupdude]

Install an 02 extender from eBay. Makes the light disappear lol. Doesn't fix the problem though.

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[TheMAN]

how many km on your car? It might still be eligible for emissions warranty coverage

[Dk_krypton]

nah not a chance. Its done almost 217k kms.

[messupdude]

nah not a chance. Its done almost 217k kms.

Do you have emissions testing in your province? If so do you know if they do the tail pipe test or OBD2 test?

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[Dk_krypton]

Do you have emissions testing in your province? If so do you know if they do the tail pipe test or OBD2 test?

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Oh I'm the GTA, so as far as I remember its both obd2 and the tailpipe