Another persistent P0420

[Meccanoble]

I need to just shut up sometimes. My CEL came on yesterday, day after my comment LOL. Going to take it in for airbag recall and see if they can confirm what exactly needs to be changed. Cats are the highest bidder...

 

[Meccanoble]

Just wanted to add I used Dura Lube and CEL came on after like 15 miles. Sounds like the new headers/cats is most affordable solution. Any brand preffered?

 

[swathdiver]

Just wanted to add I used Dura Lube and CEL came on after like 15 miles. Sounds like the new headers/cats is most affordable solution. Any brand preffered?

Stock manifolds will provide the least noise in the cab. Try to get a stock Y-Pipe and Cats if your budget allows. I am running a Magnaflow cats and y-pipe four years now without issue.

Long tube headers can come with catted y-pipes, have to check with each manufacturer.

 

[TomH91]

Walker 50486. Nice stainless y-pipe and cats. Just need gaskets, sold separately.

 

[Meccanoble]

Walker 50486. Nice stainless y-pipe and cats. Just need gaskets, sold separately.

More Information for WALKER 50486

www.rockauto.com

$600, jesus

 

[Doubeleive]

More Information for WALKER 50486

www.rockauto.com

$600, jesus

that's cheap and probably not even the carb complaint ones, those are usually more and cat prices have been double that in the recent past because of covid and lack of availability.

 

[TomH91]

Yes, Magnaflow is 1200 or maybe 1000 if you catch a coupon. Walker is the most affordable, less than even GM OE. Prices on all of them are way up since 2018-19.

Magnaflow: https://www.hottexhaust.com/magnafl...catalytic-converter-direct-fit-oem-grade-epa/

 

[Meccanoble]

The power of God! I had to replace my battery and all of a sudden, i'm going hundreds of miles with no CEL. I passed my inspection!!! Not sure if the cataclean had some long term effects that helped, i used like 3 bottles within 2 months

 

[OldEngineer]

Despite all the things I did and had the shop do, the cat efficiency code for bank 1 continued to crop up until I relented and replaced the cats. I was hoping to avoid the expense of new cats but with the miles the factory ones were pretty much aged out.

Tom,
it's been a few months.
Has the issue still been fixed since you replaced the cats?

 

[Meccanoble]

Tom,
it's been a few months.
Has the issue still been fixed since you replaced the cats?

Curious as well. My CEL came back on after a few hundred miles but was able to get inspection so not in a rush.

 

[swathdiver]

Curious as well. My CEL came back on after a few hundred miles but was able to get inspection so not in a rush.

It probably helped kick the can down the road.

I'm running Magnaflow's cats and y-pipe, 51578, on mine since 2018 from Got Exhaust, a vendor here, though I haven't heard from them in a while. Just over 49K miles now, no issues.

 

[TomH91]

Hi, sorry for the delayed reply. I don’t get notifications for whatever reason.

No check engine light, no issues so far after a few thousand miles.