jeffro Posted February 3, 2015 Report Share Posted February 3, 2015 Who has one and would be willing to scan my 2002 a4 quattro in return for a case of beer or something? My ESP light is stuck on and instead of fixing things that dont need fixin, Id rather scan it and go straight to the cause. I dont know how vag-com works, so if this is something that cannot be done without purchasing a new license, then feel free to ignore. I live in Dublin but willing to travel. Some additional information: Several months ago the ESP light started turning on and off on its own. It began by coming on several miles into the drive, and sometimes not at all. Now, its on 100% of the time the instant i start the car. Cruise control no longer works as a result. ABS may or may not work as i don't drive like a dick enough to find out. Thanks dudes Quote Link to comment Share on other sites More sharing options...
Supplicium Posted February 3, 2015 Report Share Posted February 3, 2015 Jeffro - Unplug your battery for 10min then see if that resets it. If not check your brake pads esp the rears when they get low it can pop it. If neither of those work its either a bad brake light sensor or ebrake sensor Quote Link to comment Share on other sites More sharing options...
jeffro Posted February 3, 2015 Author Report Share Posted February 3, 2015 Welp, after actually paying close attention to it, i'm almost 100% certain it is the brake light sensor/switch. If i start the car without pressing the brake the light remains off. I noticed that the instant i press the brake is when the light comes on. Cheap part IIRC. Quote Link to comment Share on other sites More sharing options...
cybe Posted February 3, 2015 Report Share Posted February 3, 2015 Cheap part, not bad to replace. Had this happen in the 03 Allroad. It did all kinds of other stuff too including loss of power (boost cut?) DIY: http://www.audizine.com/forum/showthread.php/331013-DIY-B6-B7-A4-S4-Sticky-Brake-Light-Switch FWIW, I don't think I had to pull down the dash / harness stuff. Just get in the driver's seat upside down and have at it. Pay attention to the twist-locking mechanism, don't unlock it before it's installed. Quote Link to comment Share on other sites More sharing options...
jeffro Posted February 5, 2015 Author Report Share Posted February 5, 2015 Picked up a new BLS from Mag on tuesday. Installed it last night. Immediately noticed the light doesn't come on right away. It seems the little plunger thing doesn't want to extend when i press the brake pedal. I can hear it clicking sometimes like its catching inside the switch itself. When the plunger gets stuck it causes the ABS light AND the ESP light to come on. Tonight i will take it back apart and see if i can get it to work properly. Quote Link to comment Share on other sites More sharing options...
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