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View Full Version : CEL with code P0421. Its a failing Catalytic convertor


Dk_krypton
12-15-2016, 01:47 PM
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-exhaust-systems/magnaflow-direct-fit-oem-grade-catalytic-converter-with-header-shipping-restrictions-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
12-15-2016, 08:28 PM
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
12-15-2016, 08:29 PM
@dailydose
Default User
12-15-2016, 08:29 PM
Daileydose
Daileydose
12-15-2016, 09:34 PM
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
12-15-2016, 09:35 PM
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.

Sent from my Nexus 6P using Tapatalk Cant cut the cat without effecting the exhaust manifold.
LinkinEffect
12-16-2016, 06:15 PM
That's depressing because I personally need a new cat. Sigh.

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Daileydose
12-16-2016, 11:46 PM
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
12-29-2016, 05:17 PM
Install an 02 extender from eBay. Makes the light disappear lol. Doesn't fix the problem though.

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TheMAN
12-29-2016, 09:01 PM
how many km on your car? It might still be eligible for emissions warranty coverage
Dk_krypton
12-29-2016, 11:39 PM
nah not a chance. Its done almost 217k kms.
messupdude
12-30-2016, 03:29 PM
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
12-30-2016, 11:08 PM
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