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Old 02-21-2017, 11:31 AM   #1
SamMoranPranks
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Check Engine Light

Hey all,

So this past weekend I did an entire exhaust over hall with brand new 2.5" pipes to an x-pipe to a muffler delete. They're bigger than the 2.25" pipes that come factory. I had the NPP exhaust a while back but did a muffler delete on that a long time ago.
I unplugged the sensors for the NPP exhaust for the first time ever (because they're non existent now) and it caused the CEL. Anyone know of a tune or anything to get rid of that light?
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Old 02-21-2017, 11:35 AM   #2
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do you have the code ? what code is it throwing?
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Old 02-21-2017, 12:21 PM   #3
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Quote:
Originally Posted by cmeJATT View Post
do you have the code ? what code is it throwing?
The code is showing the emissions system. That's the fuel management system is not functioning correctly. But I've never gotten a CEL until I unplugged those sensors. The car runs fine, starts up just fine too.
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Old 02-21-2017, 12:36 PM   #4
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Quote:
Originally Posted by cmeJATT View Post
do you have the code ? what code is it throwing?
As he said, what is the exact code? Should start with a "P" followed by 4 digits
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Old 02-21-2017, 12:46 PM   #5
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Quote:
Originally Posted by ctrlz View Post
As he said, what is the exact code? Should start with a "P" followed by 4 digits
I'll have to go today and get the actual code. I don't have a device that checks it. I'll tune in when I get the code number

Thanks
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Old 02-21-2017, 01:19 PM   #6
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once you have the code you can see what's wrong..

do you have A8 or M6?
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Old 02-21-2017, 02:02 PM   #7
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Quote:
Originally Posted by cmeJATT View Post
once you have the code you can see what's wrong..

do you have A8 or M6?
I have the A8. I'm thinking its those sensors, or they didn't weld correctly and theres a leak somewhere. I'll get the code checked out today after work though and see whats up. They cleared the code yesterday at the exhaust shop but it came back after i turned the car off and then back on. I just didn't ask them what the code was.
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Old 02-21-2017, 02:19 PM   #8
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yeah the A8 are tricky because of the AFM sensors ..

check for leaks also .. i heard when you have a leak it will cause a CEL( but normally around the cat only ) ..
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Old 02-21-2017, 02:33 PM   #9
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The factory diameter exhaust is actually 2.75" not 2.25"
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Old 02-21-2017, 02:42 PM   #10
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The factory diameter exhaust is actually 2.75" not 2.25"
On the SS it is, not the V6
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Old 02-21-2017, 11:23 PM   #11
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You can't just unplug the AFM sensors. That is why you have a check engine light. Why would you think it was OK to just unplug them?
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Old 02-22-2017, 09:23 AM   #12
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Quote:
Originally Posted by Megahurtz View Post
You can't just unplug the AFM sensors. That is why you have a check engine light. Why would you think it was OK to just unplug them?
He mentioned NPP sensors but wondering if he actually unplugged the AFM connections like you mentioned. Yea definitely can't do that without a CEL.
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Old 02-22-2017, 09:31 AM   #13
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Quote:
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He mentioned NPP sensors...
Are there NPP "sensors"? And, if so, what do they do? Can't see how it matters if the NPP valves are open, closed, working, or not, other than to change the noise.
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Old 02-22-2017, 09:45 AM   #14
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Quote:
Originally Posted by ctrlz View Post
Are there NPP "sensors"? And, if so, what do they do? Can't see how it matters if the NPP valves are open, closed, working, or not, other than to change the noise.
Might have meant the actual connections for the NPP valves. Think the AFM valves work the same way though.
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