2014 silverado 1500 bad catalytic converter Code P0420/P0430

[Logan S]

Hello,

 

Thanks for your help in advance! I've seen some other threads on this, but nothing that covers what cats I can use to replace the bad ones. I bought a 14' Chev with the 5.3 just a couple months ago. Several problems since then. I just took it to a mechanic because it had a check engine light on and wouldn't pass emissions. They said it's a bad fuel pump and would need to be replaced with a high pressure. So we did that for $1,000 but the two codes came up again the next day. P0430, P0420. I know one of the cats was already replaced and I was told it's a good quality one. 

 

I was told by the same shop that did the fuel pump that only OEM cats will work/not throw the codes. Are there aftermarket cats that will work so I don't have to drop another $2,000 for OEM cats?

Logan 

 

[swathdiver]

On 3/13/2021 at 12:20 PM, Logan S said:

Hello,

 

Thanks for your help in advance! I've seen some other threads on this, but nothing that covers what cats I can use to replace the bad ones. I bought a 14' Chev with the 5.3 just a couple months ago. Several problems since then. I just took it to a mechanic because it had a check engine light on and wouldn't pass emissions. They said it's a bad fuel pump and would need to be replaced with a high pressure. So we did that for $1,000 but the two codes came up again the next day. P0430, P0420. I know one of the cats was already replaced and I was told it's a good quality one. 

 

I was told by the same shop that did the fuel pump that only OEM cats will work/not throw the codes. Are there aftermarket cats that will work so I don't have to drop another $2,000 for OEM cats?

Logan 

 

The bad fuel pump likely took out the new cat, so make sure all is well before you replace them again.  I have Magnaflow cats and y-pipe on my truck now for over 3 years with no troubles.  Got a good deal from GotExhaust back then.  Cheap Chicom cats don't long at all.  Sell your old ones to the scrap man to offset the cost.

Edited March 27, 2021 by swathdiver