Stage 2 CEL
Thread Starter
Super Member
Joined: Jul 2012
Posts: 737
Likes: 60
From: HESPERIA CA
2011 E550
Stage 2 CEL
Hey guys, so I have a quick question to everyone that's running stage 2 in their M278 cars.
But a little back story before, basically last week I had gotten catless DPs, I drive home and on the way home I had gotten the CEL for the cats, which was expected. I had uploaded stage 2 from one of the tuners on here and thought everything was ok, but about 10 miles later I got the CEL again, and now have been going back and forth with the company. The last thing they asked me was if I had the o2 bungs in place, and I told them I did, but doesn't stage 2 cancel out those sensors anyway?
Basically my questions are.
1. Doesn't stage 2 cancel out the 02 sensors?
2. Why does the CEL keep coming back? I was told by the tuner that I needed to use an OBD2 code clearer for the code to go away, I used my Torque app and cleared it, but it keeps showing me "historic fault" and the CEL comes back on.
3. This one is kind of unrelated, but did any of you stage 2 owners get a smell? Like holy crap coming to a stop with my windows down I immediately get the smell of gas lol.
But a little back story before, basically last week I had gotten catless DPs, I drive home and on the way home I had gotten the CEL for the cats, which was expected. I had uploaded stage 2 from one of the tuners on here and thought everything was ok, but about 10 miles later I got the CEL again, and now have been going back and forth with the company. The last thing they asked me was if I had the o2 bungs in place, and I told them I did, but doesn't stage 2 cancel out those sensors anyway?
Basically my questions are.
1. Doesn't stage 2 cancel out the 02 sensors?
2. Why does the CEL keep coming back? I was told by the tuner that I needed to use an OBD2 code clearer for the code to go away, I used my Torque app and cleared it, but it keeps showing me "historic fault" and the CEL comes back on.
3. This one is kind of unrelated, but did any of you stage 2 owners get a smell? Like holy crap coming to a stop with my windows down I immediately get the smell of gas lol.
Senior Member
Joined: Jun 2007
Posts: 442
Likes: 48
From: Los Angeles
2015 E63 - Current, 2012 E550 - Current, 2019 Audi Q7 3.0T - current
You should NOT be getting a smell of gas what so ever. With no cats you will only smell exhaust but if you had it installed correctly there should not be an exhaust leak that strong. Who is your company? you are here in California and OC is not that far from you where most of the local tuners are. You are correct that stage 2 for catless dp's is turning off the CEL btw.
Thread Starter
Super Member
Joined: Jul 2012
Posts: 737
Likes: 60
From: HESPERIA CA
2011 E550
Originally Posted by BlownS4
You should NOT be getting a smell of gas what so ever. With no cats you will only smell exhaust but if you had it installed correctly there should not be an exhaust leak that strong. Who is your company? you are here in California and OC is not that far from you where most of the local tuners are. You are correct that stage 2 for catless dp's is turning off the CEL btw.
And other than the smell of gas, could there be anything detrimental with the exhaust leak?
Super Member
Joined: Feb 2007
Posts: 613
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From: Republic of Texas
W203 W212 W211 R53MCS
It is all in the tune... rear O2 sensors can be deleted(sensor unplugged) or they turn off the rear O2 diagnostic (sensors intalled). Definitely you should not have a gas smell. What company are you using???
Thread Starter
Super Member
Joined: Jul 2012
Posts: 737
Likes: 60
From: HESPERIA CA
2011 E550
Originally Posted by MBENZTECH
It is all in the tune... rear O2 sensors can be deleted(sensor unplugged) or they turn off the rear O2 diagnostic (sensors intalled). Definitely you should not have a gas smell. What company are you using???
Thread Starter
Super Member
Joined: Jul 2012
Posts: 737
Likes: 60
From: HESPERIA CA
2011 E550
Originally Posted by BlownS4
He was asking what Tuner I believe
Last edited by bob2011; Jun 2, 2020 at 04:56 PM.
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Senior Member
Joined: Jun 2007
Posts: 442
Likes: 48
From: Los Angeles
2015 E63 - Current, 2012 E550 - Current, 2019 Audi Q7 3.0T - current
Thread Starter
Super Member
Joined: Jul 2012
Posts: 737
Likes: 60
From: HESPERIA CA
2011 E550
Originally Posted by BlownS4
I was going to say maybe they sent you the wrong tune. Glad you got it fixed.
Make sure you get that gas smell checked out as well.
Make sure you get that gas smell checked out as well.
