Go Back   AudiWorld Forums > Audi Models > Audi A6 / S6 / RS 6 > A6 (C7 Platform) Discussion
Sign in using an external account
Register Forgot Password?


A6 (C7 Platform) Discussion Discussion forum for the C7 Audi A6 produced from 2011

Engine light

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread Display Modes
Old 03-20-2014, 01:01 PM   #1
Audiworld Junior Member
Account #: 176646
 
Join Date: Jan 2010
Posts: 28
Default Engine light

On the way home today I got an engine light. I filled up this morning and checked the fuel cap. Anyone else have this problem. The car seems fine. Any ideas?
kevin880 is offline   Reply With Quote
Old 03-20-2014, 01:05 PM   #2
Audiworld Junior Member
Account #: 278846
 
Join Date: Mar 2014
Posts: 20
Default

I had the same thing happen the other day, dealer said its common and to take the cap,off and put it back on again and the light should go out after 50 miles or so, it hasn't, gonna fill up with gas and see what happens tomorrow. Seems like if it isn't flashing then it's not serious, that's the impression the dealer gave anyway.
Buzztt is offline   Reply With Quote
Old 03-20-2014, 01:10 PM   #3
AudiWorld Newcomer
Account #: 279465
 
Join Date: Mar 2014
Location: Colorado
Posts: 5
Default

I had mine do that when I first got it took the cap off put it back on and it turned off for me. Just to be safe I would stop by a auto parts store and hook it up to the computer for free just to see what code is showing.
MAXXO6 is offline   Reply With Quote
Old 03-20-2014, 01:20 PM   #4
AudiWorld Member
Account #: 223734
 
jr'sAudiA6's Avatar
 
Join Date: Oct 2011
Location: Riverside, CA
Posts: 385
Default

I had this happen last year on a trip to Lake Tahoe. I had my laptop and VAG COM cable, so hooked it up and found evaporative system fault(or something similar). So I reseated the gas cap and cleared the fault and it has not happened again.
__________________

2012 A6 Prestige Pkg, Innovation Pkg, Bang and Olefson sound system, 20" Sport Pkg, Stasis 370mm front brakes
KW variant 3 suspension with Stasis rear ARB and adjustable front upper control arms
GIAC Stage 2 Tune, P3cars Vent Integrated Digital Interface(VIDI), injen intake, AWE exhaust
Lumar Tint:
CTX 50% Tint Front Side Windows
CTX 30% Tint Rear & Rear Side Windows
AIR 80% Front Windshield
XPEL Ultimate Clear Bra on entire hood and left & right fenders
jr'sAudiA6 is offline   Reply With Quote
Old 03-20-2014, 01:30 PM   #5
Audiworld Junior Member
Account #: 278846
 
Join Date: Mar 2014
Posts: 20
Default

Quote:
Originally Posted by jr'sAudiA6 View Post
I had this happen last year on a trip to Lake Tahoe. I had my laptop and VAG COM cable, so hooked it up and found evaporative system fault(or something similar). So I reseated the gas cap and cleared the fault and it has not happened again.
That's what I assumed I would have to do, I've never had a cel just go away on its own, they have always had to cleared.
Buzztt is offline   Reply With Quote
Old 03-20-2014, 06:07 PM   #6
Banned
Account #: 267421
 
Join Date: Sep 2013
Location: NYC
Posts: 663
Default

What code is it throwing? Thats the only way to know whats wrong.
Mike_L is offline   Reply With Quote
Old 03-20-2014, 06:37 PM   #7
AudiWorld Super User
Account #: 22753
 
snagitseven's Avatar
 
Join Date: Jul 2001
Location: SE MA
Posts: 8,029
Default

Over the years, I've experienced this as well on all of my Audis at least once and most times it was an evap pressure error due to the gas cap not being tightly secured. The CEL always disappeared after some time on it's own after re tightening the cap except one time when I had to replace a bad cap that wasn't sealing properly. (Most CELs will eventually turn off on their own if the issue that generated a fault code is not ongoing or reoccurring, though the fault will be in the record unless cleared by the dealer or VCDS). I now always give the cap three clicks when tightening and it I haven't had that issue since.
__________________

- 2013 A6 3.0T Prestige, Quartz Gray/Black, 19" Sport, Driver Assist, LED headlights,Cold Weather and B&O;
Bridgestone RE970AS tires; XPel Ultimate full front, mirrors and rocker panels, Opti-coat Pro
- 2002 allroad 2.7t - 13y/50K mi and still like new
- 2009 A4 3.2 Prestige w/Nav (sold at 4y/48K mi)
- 2001 A6 2.7t (sold at 8y/98K mi)
snagitseven is offline   Reply With Quote
Old 03-21-2014, 03:08 AM   #8
Audiworld Junior Member
Account #: 278846
 
Join Date: Mar 2014
Posts: 20
Default

update, my light cleared this morning, after approx 180 miles
Buzztt is offline   Reply With Quote
Old 03-21-2014, 05:17 AM   #9
AudiWorld Super User
Account #: 525
 
Join Date: Mar 2000
Posts: 20,324
Default

Quote:
Originally Posted by Buzztt View Post
update, my light cleared this morning, after approx 180 miles
Congratulations, you now know even less about what the problem is... I hate to keep repeating this, but it's as true today as it was a decade ago Know the code(s)!!!!

For a $40K+ car, please just spend the few hundred bucks on a VCDS (new name for Vag-Com) setup and know what's going on with your car. Getting to do all the fun and useful system tweaks with it is gravy!
__________________
Richard
'14 S6 4.0TQDSG
'01 A6 2.7TQM - Sold
"Turbos make torque, and torque makes fun." -Corky Bell

Please help get PDF manuals from AoA by supporting http://www.audipdfpetition.org
Richard Solomon is offline   Reply With Quote
Old 03-21-2014, 06:11 AM   #10
AudiWorld Member
Account #: 273296
 
Join Date: Dec 2013
Posts: 270
Default

As an Engineer, I'm fully cognizant of Human Factors and The CEL--check ENGINE light-- has been a major gripe of mine for years. For drivers not understanding that this light indicates a problem with Emission controls and not necessarily the Engine, when the light goes on they think the engine is about to malfunction, quit or maybe even be damaged if you keep driving. I know of several people who have pulled their car to the side of the road and had it towed to a dealer--so as to not ruin the engine, when the CEL comes on.

With that said, if you leave the gas cap loose it will trigger the CEL, if one injector fails to fire one time, it will trigger the CEL as will a Spark Plug failing to fire one time. Usually, If the thing that triggered the CEL does not happen again for 3 Warm-up cycles, then the light will just re-set itself.

So first of all this warning should have referred to Emission controls and not the Engine. Also, the malfunction event should occur a few times, maybe 3-5 instead of just one single isolated occurrence, for the light to be triggered.

Rant Finished!
dicktahoe is offline   Reply With Quote
Old 03-21-2014, 07:42 AM   #11
Audiworld Junior Member
Account #: 278846
 
Join Date: Mar 2014
Posts: 20
Default

Quote:
Originally Posted by Richard Solomon View Post
Congratulations, you now know even less about what the problem is... I hate to keep repeating this, but it's as true today as it was a decade ago Know the code(s)!!!!

For a $40K+ car, please just spend the few hundred bucks on a VCDS (new name for Vag-Com) setup and know what's going on with your car. Getting to do all the fun and useful system tweaks with it is gravy!
having been told by a tech that the problem is very likely a loose filler cap and having noted that the filler cap was indeed loose, tightened it up and then a day later the light went out, im pretty sure i know what the problem was.

i bought a cpo for a reason, so i dont have to freak out if a light comes on, if the problems arises again ill take it to the dealer and they can fix it.

my friend has vcds and he is coming to my house so i can do all the tweeks i want, theres no point buying one.
Buzztt is offline   Reply With Quote
Old 03-21-2014, 07:51 AM   #12
AudiWorld Super User
Account #: 525
 
Join Date: Mar 2000
Posts: 20,324
Default

CEL (Check Engine Light/lamp) is a misnomer, I think the OBD spec calls it the MIL (Malfunction Indication Light/lamp).

Quote:
Originally Posted by dicktahoe View Post
Also, the malfunction event should occur a few times, maybe 3-5 instead of just one single isolated occurrence, for the light to be triggered.
Actually this is already true - depending on the malfunction detected the MIL may be set immediately or only after a set # of occurrences. O2 sensors are absolutely filtered that way - glitches are filtered repeatedly before the MIL is finally set. I also know misfires are also similarly filtered, but I can't speak to detection of an injector failure - if that even happens. My car was misfiring like a big dog and the MIL wouldn't set for several minutes. VCDS showed the misfire codes immediately and the MIL wouldn't set for some time.

The gas cap AFAIK is actually also "filtered" but since you don't generally touch the cap during a drive cycle, it feels like "once" to you The car pressurizes the fuel system at various times via the LDP (Leak Detection Pump) looking for leaks, and depending on the magnitude of the leak (rapidity with which pressure drops) it sets small or large leak codes and triggers the MIL after some number of events. (I haven't looked lately, but large leak might be immediate MIL, I do know small leaks don't necessarily set the MIL.)
__________________
Richard
'14 S6 4.0TQDSG
'01 A6 2.7TQM - Sold
"Turbos make torque, and torque makes fun." -Corky Bell

Please help get PDF manuals from AoA by supporting http://www.audipdfpetition.org
Richard Solomon is offline   Reply With Quote
Old 03-21-2014, 08:20 AM   #13
AudiWorld Super User
Account #: 22753
 
snagitseven's Avatar
 
Join Date: Jul 2001
Location: SE MA
Posts: 8,029
Default

CEL, OBD, MIL, ESC, ESP, ACC, DIS, LDP, ASR, DSR, EPS, ABS, GPS, RPM, PSI, TDI, TFSI, ECU, HUD, HID, LCD, OEM, VIN, TPMS and the beloved MMI, just to name a few.
OMG, what is an Audi neophyte to do with the alphabet soup of acronyms? LOL.
__________________

- 2013 A6 3.0T Prestige, Quartz Gray/Black, 19" Sport, Driver Assist, LED headlights,Cold Weather and B&O;
Bridgestone RE970AS tires; XPel Ultimate full front, mirrors and rocker panels, Opti-coat Pro
- 2002 allroad 2.7t - 13y/50K mi and still like new
- 2009 A4 3.2 Prestige w/Nav (sold at 4y/48K mi)
- 2001 A6 2.7t (sold at 8y/98K mi)
snagitseven is offline   Reply With Quote
Old 03-21-2014, 08:46 AM   #14
Banned
Account #: 267421
 
Join Date: Sep 2013
Location: NYC
Posts: 663
Default

Quote:
Originally Posted by snagitseven View Post
CEL, OBD, MIL, ESC, ESP, ACC, DIS, LDP, ASR, DSR, EPS, ABS, GPS, RPM, PSI, TDI, TFSI, ECU, HUD, HID, LCD, OEM, VIN, TPMS and the beloved MMI, just to name a few.
OMG, what is an Audi neophyte to do with the alphabet soup of acronyms? LOL.
Some of those I don't know
CEL - Check Engine Light,
OBD - On Board Diagnostics,
MIL - Malfunction Indicator Light,
ESC - Electronic Stability Control,
ESP - Electronic Stability Program,
ACC - Adaptive Cruise Control,
DIS - Driver Information Center,
LDP - Lane Departure Program, ?
ASR - Acceleration Slip Regulation,
DSR - ???,
EPS - ???,
ABS - Antilock Braking System,
GPS - Global Positioning System (or Satellite),
RPM - Revolutions Per Minute,
PSI - Pounds per Square Inch,
TDI - Turbo Diesel Injection,
TFSI - "Turbo" Fuel Stratified Injection,
ECU - Engine (or electronic) Control Unit,
HUD - Heads Up Display,
HID - High Intensity Discharge,
LCD - Liquid Crystal Display,
OEM - Original Equipment Manufacturer,
VIN - Vehicle Identification Number,
TPMS - Tire Pressure Monitoring System,
MMI - MultiMedia Interface
Mike_L is offline   Reply With Quote
Old 03-21-2014, 09:37 AM   #15
AudiWorld Super User
Account #: 22753
 
snagitseven's Avatar
 
Join Date: Jul 2001
Location: SE MA
Posts: 8,029
Default

DSR - Driver Steering Recommendation
EPS - Electronic Power Steering

and just in case:
OMG - Oh my gosh (or God)
LOL - Laughing out loud (or can be Lots of love)
__________________

- 2013 A6 3.0T Prestige, Quartz Gray/Black, 19" Sport, Driver Assist, LED headlights,Cold Weather and B&O;
Bridgestone RE970AS tires; XPel Ultimate full front, mirrors and rocker panels, Opti-coat Pro
- 2002 allroad 2.7t - 13y/50K mi and still like new
- 2009 A4 3.2 Prestige w/Nav (sold at 4y/48K mi)
- 2001 A6 2.7t (sold at 8y/98K mi)
snagitseven is offline   Reply With Quote
Old 03-21-2014, 12:31 PM   #16
Audiworld Junior Member
Account #: 176646
 
Join Date: Jan 2010
Posts: 28
Default Update on check engine light

I went to dealer today and the problem is a knock sensor is bad. It requires 4 hours labor and the removal of the manifold.Time to get rid of the car.
kevin880 is offline   Reply With Quote
Old 03-21-2014, 01:13 PM   #17
AudiWorld Super User
Account #: 525
 
Join Date: Mar 2000
Posts: 20,324
Default

Quote:
Originally Posted by kevin880 View Post
I went to dealer today and the problem is a knock sensor is bad. It requires 4 hours labor and the removal of the manifold.Time to get rid of the car.
Are you out of warranty? I'd try escalating that if so, knock sensors shouldn't just "go bad", and I'm a bit suspicious of that diagnosis anyway! What were the codes thrown?

Quote:
Originally Posted by Buzztt View Post
having noted that the filler cap was indeed loose, tightened it up and then a day later the light went out
While this highlighted part is key (and I didn't notice it in your earlier post), you do know what they say about what happens when you ****u*me... Definitely have your friend pull the codes if a VCDS is out of your means or whatever.
__________________
Richard
'14 S6 4.0TQDSG
'01 A6 2.7TQM - Sold
"Turbos make torque, and torque makes fun." -Corky Bell

Please help get PDF manuals from AoA by supporting http://www.audipdfpetition.org
Richard Solomon is offline   Reply With Quote
Old 03-21-2014, 02:16 PM   #18
Banned
Account #: 267421
 
Join Date: Sep 2013
Location: NYC
Posts: 663
Default

Quote:
Originally Posted by kevin880 View Post
I went to dealer today and the problem is a knock sensor is bad. It requires 4 hours labor and the removal of the manifold.Time to get rid of the car.
I'm not seeing 4 hours to swap that. Access seems to be pretty good, though tight, from underneath. Its a single bolt. They should be able to remove it and put in a new one without removing the manifold.

Anyway, it should be covered under the warranty. Knock sensors aren't wear items. They don't just wear out. If its bad, it was defective. If the first dealer won't fix it, go to another one. (Tell me you're on Long Island and went to Biener)
Mike_L is offline   Reply With Quote
Old 03-21-2014, 02:17 PM   #19
Audiworld Junior Member
Account #: 278846
 
Join Date: Mar 2014
Posts: 20
Default

Quote:
Originally Posted by Richard Solomon View Post
While this highlighted part is key (and I didn't notice it in your earlier post), you do know what they say about what happens when you ****u*me... Definitely have your friend pull the codes if a VCDS is out of your means or whatever.
So having seen symptoms of a problem, taken measures to correct the problem and then the cel light goes off letting you know it's no longer a problem you still wouldn't be satisfied, fair enough, each to their own. if my car wasn't under warranty I would check the codes and probably be more concerned but I'm gonna 'risk' it and assume the loose has cap was the issue and leave it at that, if the light comes back on again I'll take it to the dealer and let them figure it out.

And a vcds isn't out of my means, I just don't feel it's necessary to buy one for a car that's covered by warranty, and will likely be traded in within the next two years. I'lll happily spend time money and stress when it comes to my other cars which are out of warranty and are modded so need to be monitored and babied but not for a CPo Audi.

Last edited by Buzztt; 03-21-2014 at 02:23 PM.
Buzztt is offline   Reply With Quote
Old 03-21-2014, 02:25 PM   #20
Banned
Account #: 267421
 
Join Date: Sep 2013
Location: NYC
Posts: 663
Default

Quote:
Originally Posted by Buzztt View Post
So having seen symptoms of a problem, taken measures to correct the problem and then the light goes off letting you know it's no longer a problem you still wouldn't be satisfied, fair enough, each to their own. if my car wasn't under warranty I would check the codes and probably be more concerned but I'm gonna 'risk' it and assume the loose has cap was the issue and leave it at that, if the light comes back on again I'll take it to the dealer and let them figure it out.
I'm with Richard. When the light comes on, the scanner gets hooked up, first thing. Just the Actron though. Can't be bothered checking stuff with VCDS all the time.
Mike_L is offline   Reply With Quote
Old 03-21-2014, 02:25 PM
AudiWorld
Audi R8




Paid Advertisement
 
 
 
Reply

Tags
a4, audi, esc, malfunction


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



Join AudiWorld

All times are GMT -8. The time now is 05:40 AM.


Copyright 2014 AudiWorld.com Audi Enthusiast Community