Engine light
Audiworld Junior Member
Joined: Mar 2014
Posts: 20
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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!
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!
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.
AudiWorld Super User
Joined: Mar 2000
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CEL (Check Engine Light/lamp) is a misnomer, I think the OBD spec calls it the MIL (Malfunction Indication Light/lamp).
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.)
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.)
Super Moderator
Joined: Jul 2001
Posts: 13,980
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From: SE Massachusetts, U.S.
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.
OMG, what is an Audi neophyte to do with the alphabet soup of acronyms? LOL.
Banned
Joined: Sep 2013
Posts: 663
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From: NYC
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
AudiWorld Super User
Joined: Mar 2000
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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.
Banned
Joined: Sep 2013
Posts: 663
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From: NYC
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)
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Audiworld Junior Member
Joined: Mar 2014
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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; Mar 21, 2014 at 02:23 PM.
Banned
Joined: Sep 2013
Posts: 663
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From: NYC
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.