Error Code P0420

[AtlasMK5s]

I've been getting error code P0420, can anyone confirm if this is for the rear O2 sensor or front? I'm running a catless dp and Cobb, I had some issues with an exhaust leak but I thought I fixed it. Just trying to narrow it down to a tune issue or if I still have an exhaust leak. Thnx

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[Bomicino]

Has you tune been set to shut off the downstream o2?

 

[AtlasMK5s]

Not sure if rear O2 is off I'm running a The Cobb ots 93 tune. I haven't got a chance to get a pro tune yet.

 

[Bomicino]

Depending on your DP, it may not pull the rear o2 out of the exhaust far enough. My suggestion is drop $250 with Adam at MAP, get unlimited tunes and he can shut off the rear 02. More power and no check engine light.

 

[Bomicino]

I felt a noticeable gain when going from cobb ots to his tune.

 

[Ultimateone]

I dont think you should be running the Stage 1 ots with a downpipe, check the map notes

 

[MAPerformance]

Your rear o2 isn't turned off with the OTS tune, if you aren't ready to opt for an E-tune like Bomicino mentioned above you can drop me an email with your vehicle details and I can help you get it functioning again!

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