Hard one to figure out ? Another damn P0420 problem thread

[OEMPL+S]

On a CCTA the post cat sensor does nothing other than measure cat efficiency right?

I have a CCTA and stock tune with a catless downpipe and vibrant j-bend with the smallest holed piece installed ....

Why am I getting P0420 ???


-My car likes 420 ??

-The piece I chose is to small and it needs more flow to the post cat O2??

-Dirty O2 sensor?

-Bad luck?

I cleared the code yesterday and now it's back again after about 70km.


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[SELA_MK6GTI]

Go stage 2 and you’re problem will go away


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[OEMPL+S]

Ya [emoji1]

But is it gonna be a fuel consumption or performance issue on the CCTA??

I want the problem to be non existent for stock tune and stage 2 ....

Plus I might go United Motorsports tune which doesn't remove that sensor coding ....

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[SELA_MK6GTI]

It’ll improve your fuel consumption rather be about the same if you don’t get on it but just like any car it’ll consume more fuel if you hoon around everywhere lol but it’ll be a different car for sure. Hmmm most stage 2 tunes remove that cat efficiency code with catless or high flow cats to prevent the CEL. Look into other companies if United doesn’t remove it but I’m sure they could


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[OEMPL+S]

It’ll improve your fuel consumption rather be about the same if you don’t get on it but just like any car it’ll consume more fuel if you hoon around everywhere lol but it’ll be a different car for sure. Hmmm most stage 2 tunes remove that cat efficiency code with catless or high flow cats to prevent the CEL. Look into other companies if United doesn’t remove it but I’m sure they could


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Oh the tune will be fine.

I'm just wondering if the P0420 code will cause problems like fuel consumption ....


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[SELA_MK6GTI]

Oh the tune will be fine.

I'm just wondering if the P0420 code will cause problems like fuel consumption ....


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No it shouldn’t it’s just most likely because you’re catless


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[OEMPL+S]

No it shouldn’t it’s just most likely because you’re catless


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Well ya .... Didn't pop up before I went catless.

Just have read some various information about it .... But in pretty sure CCTA post cat sensor isn't to important

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[SnailPower]

I thought leaving on spacers causes fuel/efficiency problems...

 

[BudgetPhoenix]

The p0420 code wont do anything to your car, its just annoying. Basically telling you something is wrong with your cat (its missing). These cars seem picky about the o2 sensors and spacers, maybe try to angle the sensor in a different direction, lengthen it or get a new one, though ive noticed you can throw other o2 rich/lean codes with different o2 spacer combinations. Best option is to get a tune

 

[OEMPL+S]

The p0420 code wont do anything to your car, its just annoying. Basically telling you something is wrong with your cat (its missing). These cars seem picky about the o2 sensors and spacers, maybe try to angle the sensor in a different direction, lengthen it or get a new one, though ive noticed you can throw other o2 rich/lean codes with different o2 spacer combinations. Best option is to get a tune

Thanks .... That's what I was thinking .... It's just a "hey there's something up here" warning .... It's doesn't effect anything ....

I'm gonna try and change the angle ....

Maybe clean the O2

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[OEMPL+S]

I thought leaving on spacers causes fuel/efficiency problems...

Maybe on CBFA .... But I'm pretty sure CCTA rearmost sensor is just for ensuring the cat is working.

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[OEMPL+S]

Ah shyt .... Was just my mechanic put the spacer in the wrong way .... Angled backwards .... So it's getting a blast of exhaust .....

At least that's what makes sense in my head .... Everyone angles the j-bend forward.

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