You probably got P0420 catalyst efficiency below threshold. I got the same thing on a BBK catted downpipe. Most high flow cats are 200 cell while OEM ones are usually 400 cell. Most high flow ones will pop the CEL. You should be fine to drive the car. You can get an O2 spacer for the downstream sensor to get rid of the code.

 

So I got a cvf downpipe off of American muscle for my 2016 ecoboost got a check engine light today. I looked at the one I got it was a 200 cell catted downpipe. Do you think the check engine light is that or something else?

 

I added the spacer on my mbrp as well. No light or code.

 

Can i have the name of the exact spacer you used? There's too many options and shapes. I want one to work with the mbrp high flow downpipe that happens to be in your case. So specifying its brand name or code or anything might be a huge help for me.
Thanks.

 

i used the below from amazon. Also it comes with 3 inserts. I used the middle size (as recommended by many to be best choice).

https://www.amazon.com/gp/product/B00AQ7972O/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

 

I used this one:

https://smile.amazon.com/EVIL-ENERG...B07G81XZZT/ref=sr_1_5?keywords=O2+sensor+spacer&qid=1563668535&s=gateway&sr=8-5

No codes since. Don't forget the anti-seize.

 

Do you just need 1? Just for the second sensor? or also for the top one too (closest to the turbo) ?

 

just the one after the cat.

 

So I should put the 02 sensor on the second sensor right the one under the car

 

You'll cause all sorts of problems if you put a spacer on the upstream sensor.

 

The CEL takes a bit to turn on because the ECU likes to monitor and “self-test” things like catalytic converter, o2 sensors, evaporative emissions, etc. It has certain values it is looking for and will usually wait until the car runs and fails the test a couple or few times ( a few drive cycles) before it decides there is a definite issue and the light needs to come on.

 

I have the cvf catted downpipe with the OEM 2.25 connection being installed on Tuesday and it will connect to the mbrp race series cat-back for a full turbo back system. Anyone get a CEL with the cvf catted dp? if I get the CEl what spacer do I need?

According to Bama, the OTS tune will work with either the OEM or high flow cat so no revision is needed.

 

I used a vibrant L shaped o2 spacer with middle fitying
No o2 light

 

Did you get a CEL after installing the cvf catted dp without the O2 sensor restrictor installed?

I ordered from Walmart.

http://goto.walmart.com/c/404739/56...TH-ADJUSTABLE-GAS-FLOW-INSERTS/170667126?wmlspartner=wlpa&selectedSellerId=3571

 

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this is where I bought mine, same downpipe as you. - it shows up on my scanner as a low efficiency code, but it doesn't turn the check engine light on. which is all I cared about.

 

Yes. You have to use that adapter. I used the small fitting first, it still tripped o2 sensir

used middle one. The o2 sensor went away and never came back after the next day of driving. Could go to aurozone and use the scanner and clear the code after installed.

Re read

what? You need the o2 sensor installed. You just need this spacer

 

I corrected the post and added restrictor. I have the rev-x scanner so I can clear the code myself. Thanks for the information. I rescheduled the downpipe installation after I get the O2 restrictor.

 

I was able to install the o2 sensor while pipe was on the car, albeit it was extremely tight. another 1-2mm less play and I wouldn't of been able to do rotations on it to twist, but it did work for me on the car.

but smart, its easier to do it while off. I just jacked up a wheel and installed it in driveway took 10 mins

 

I have the cvf catted downpipe with the OEM 2.25 connection being installed on Tuesday and it will connect to the mbrp race series cat-back for a full turbo back system. Anyone get a CEL with the cvf catted dp? if I get the CEl what spacer do I need?

According to Bama, the OTS tune will work with either the OEM or high flow cat so no revision is needed.

I'm considering buying the CVF Catted downpipe... After installing it and running the car, do you recommend it?? It's one of my next mods I want to consider. I've already added Ford Performance Tune, Roush Air Intake, Turbosmart Dual Blow Off Valve and want to look into the downpipe... Do you recommend the CVF??

 

I have a 2020 eco boost mustang and installed a down pipe and on the Ford app it’s saying that I have a misfire is that part of the down pipe that causing it ? Bcz I don’t have a tune ?

 

Wait, what? your running a after market down pipe without a tune?

Get a tune

That being said. The mis fire can be a whole multitude of things. Have you checked your spark plug gaps?, how many miles they done? Any other mods? Boost leak. Bad fuel. Blown head gasket. Blow by and so on

 

My car has 3619.miles it’s new my homie that works at Ford told me that I may have an air leak which is causing the misfire

 

Yeah as said could very well be a boost leak. I would remove down pipe and take it straight back to the dealer.

 

this is the message I get on the Ford app

The engine system has detected a misfire fault. This can result in excessive exhaust temperatures that could damage the catalytic converter or other vehicle components