Question about 2002 Audi TT

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Alternator warning light

My alternator warning came on shortly followed by the ABS & stabilization system (triangular symbol) warnings. Is the problem likely the alternator or one of the other systems? Thanks!

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  • 16 Answers

Probably alternator. Low voltage or alternator/electrical problems will cause other lights to come on.

Posted on Jan 16, 2014

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Posted on Jan 02, 2017

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SOURCE: ABS, ESP, Level warning lights (2004 Allroad TDI)

I had the brake light switch replaced by a local dealer. Cost was $140 and it fixed the problem. Have driven the car for two weeks since and no lights and all systems normal.

Posted on Oct 15, 2008

ewashmidas
  • 362 Answers

SOURCE: abs sensor light wont go off my 2005 polo

Your ABS systems use a combination of electronic and hydraulic systems to modulate the brakes individually to prevent them from locking up. ANTILOCK systems consist of wheel speed sensors, a hydraulic control unit (HCU), and an electronic control unit (ECU). Because of how complex the system is your computer does a self-test. If the check is successful, the ANTILOCK and BRAKE lights will go out within a few seconds. If one of the component of the ABS system fails to pass one or both lights will remain lit. One or both warning lights may also come on while driving, also indicating a problem. If just the ANTILOCK warning light comes on, some ABS component has failed, but the car still has hydraulic brakes. The grinding noise could the the ABS pump or your brake pads could to worn to the metal backing and grinding against the brake rotors. I recommend a inspection soon for your safety.

Posted on Mar 04, 2009

  • 1114 Answers

SOURCE: 2005 Audi A4 Emission Control System Indicator

A vehicle's Emission Control Light is a generalized indicator that there is fault or possible malfunction in the vehicle's operating system. In some cases, these warning lights will come on if a gas cap is not fully closed. It could any one of a number of sensors such as the o2 sensor or map sensor. The thing to do is have a reputable mechanic/technician run a diagnostics test on the vehicle.

Posted on Aug 20, 2009

  • 1 Answer

SOURCE: 2003 audi a4 1.8t ECU/emission control system warning light flash

No I am a mechanic at Audi. The problem is that the the air flow to the central tappets may be causing the air flow sensor to trip and that is why. Try putting a small amount of WD40 into the petrol and that will work, its a very common problem.

Posted on Nov 16, 2009

  • 1 Answer

SOURCE: mk1 A4 ABS warning light

I have a 2000 Audi A4 and the break wear sensor warning light come on for me too. It does not flash and is orange in color. I have asked the Audi dealer twice about it and they told me it's because the previous owner put aftermarket break pads on it, thus messing up the sensors. I don't know about the ABS warning and other than that I wish you luck on it.

Posted on Dec 29, 2009

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1 Answer

Electronic stability control & abs & brake assist warning indicator lights are coming on after an accident. How serious are they?


You have damage to the front area brake system. It could be very serious but if car stops OK most likely not that serious you just won't have abs or traction control. The damage is most likely a speed sensor or something similar. I said it could be serious that is only worst case.
Here is a breakdown of what lights mean
ABS keeps your breaks from locking up
BREAK ASSIST helps your breaks
Traction control if you one wheels spin more than others system adjust wheel spiN

Dec 19, 2015 | Cars & Trucks

1 Answer

How can i reset esc and abs dash light


The warning lights will stay on until the problem with the stability control and anti lock braking system is addressed and rectified.

If the warning lights are still showing there is still a problem with the system such as faulty wheel sensors.

May 19, 2015 | 2010 Hyundai Getz 1.6

1 Answer

My traction & stability control warning keeps coming on, not all the time but occaisionally


You have a problem with the abs an there is a code stored in the EBCM - electronic brake control module . It could be any number of thing's from a wheel speed sensor to a wiring problem or the control module or the modulation pump . As long as the light is on the ABS is deactivated . I would take it a qualified ASE certified repair shop that knows ABS systems

Apr 28, 2015 | Cars & Trucks

1 Answer

Abs and traction control light as well as Stabilty control off displayed


Don't ask people to guess when you can easily get the trouble codes read. That's ALWAYS the first step. If the light is on, a code is stored.

Nov 25, 2017 | Cars & Trucks

1 Answer

I have an XJR 2002 the warning light DSC has come on what does it mean?


DSC means "Dynamic stability control" it is caused by some kind of failure in the ABS/Stability control system, it all one system. You will need to seek a dealer out to find out the exact cause of the warning

Sep 01, 2011 | 2002 Jaguar X-Type

1 Answer

What is the following warning symbol. Yellow triangle in a yellow circle, with squiglly lines in it?


ASR - Acceleration Skid Control system.
When ASR warning light blinking the system is activated itself for car acceleration skid control.


For today's typical high-torque engines, traction control (ASR) can increase both comfort and safety, particularly when driving on slippery roads or surfaces offering differing levels of grip. Traction control permits smooth starting and acceleration through the full speed range without wheel-spin or fishtailing.

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ASR only operates in conjunction with the electronic accelerator (E-gas) and uses components of the anti-lock braking system (ABS). If one wheel suddenly begins to rotate faster than the others (slip), ASR intervenes in the engine management system and reduces power until the wheel stops spinning.
The ASR system represents a further contribution to active safety as it maintains vehicle traction and directional stability throughout the acceleration phase at any speed. In addition, it reduces tyre wear. Activation of the ASR system is indicated by a flashing indicator lamp in the instrument cluster.

The ESP system means the Electronic Stability Program. If the ESP lights on the dashboard permanently the ESP system is faulty. You must access the ESP Electronic Control Unit (ECU) memory for pull out all DTC (Diagnostic Trouble Codes), using diagnostic equipment connected to the data link connector of the car. Then you will be full informed about bad pieces (e.g.: front right wheel abs sensor interrupted, ...). After bad pieces replacement you will be able to erase all faults memored by ESP ECU, in other words reset the ESP system and turn off the warning lamp on dashboard.

May 13, 2011 | Volkswagen Passat Cars & Trucks

1 Answer

2004 Tahoe with the following indications service tire monitor warning service stability warning abs light TC disabled Seems to have all happened at once!


It is a problem with your abs this will cause traction and stability to turn off as they work off abs system. need to have scanned for codes. ebcm is common about going out on these

Oct 12, 2010 | 2004 Chevrolet Tahoe

1 Answer

ABS and ASC warning lights stay on 2000 530d


Check to see if your brake pads and rotors are in good condition. Or if you have replaced the pads yourself and have not reset the wheel sensors this would cause the ABS Antilock Brake System light and the ASC Automatic Stability Control light to stay on as the ASC uses the ABS brakes with computer assistance to control the car

Jul 06, 2009 | 1999 BMW 5 Series

1 Answer

Problem with my cruise control and ABS light on 03 Explorer


Anti-Lock Control —Vehicles Built After 03/2002 The 3-channel anti-lock brake system consists of the following components:
  • front wheel speed sensors
  • front wheel speed sensor rings
  • hydraulic control unit (HCU)
  • Anti-lock brake control module (ECU)
  • rear wheel speed sensor
  • rear wheel speed sensor rings
  • yellow anti-lock brake warning indicator
The 4-channel anti-lock brake system with traction control and stability assist system consists of the following components:
  • active brake booster with integral solenoid
  • brake booster release switch
  • front wheel speed sensors
  • front wheel speed sensor rings
  • hydraulic control unit (HCU)
  • stability assist module (ECU)
  • stability assist event indicator
  • lateral accelerometer
  • longitudinal accelerometer (4x4)
  • rear wheel speed sensors
  • rear wheel speed sensor rings
  • steering wheel position sensor
  • yaw rate sensor
  • yellow anti-lock brake warning indicator
  • brake pressure transducer
  • traction control switch
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I suspect the abs issue is causing the speed control not to work if it happened at the same time the cruise control stopped working. When the yellow ABS light comes on, it means the ABS is dactivated. You may have a faulty accelerometer which senses acceleration and yaw (side to side lean). I have not seen a bad one but you said it is sensitive to acceleration.
I would unplug it and see what happens. The connector should have a small tab to depress so you can pull the connector out.
Here is where it is:

Accelerometer Removal and Installation
  1. NOTE: The accelerometer is located under the center, rear passenger seat carpet. (I think you have to remove seat for access).
    Cut the carpeting along the perforations.
  1. Disconnect the electrical connector.
  1. Remove the nuts and remove the accelerometer.
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Have dealer hook up tester and pull fault codes if you can't find an easy solution.
Some background info
  • A malfunction in the anti-lock brake system will cause the anti-lock brake control module to shut off or inhibit the system. However, normal power-assisted braking remains.
  • Malfunctions are indicated by the yellow ABS warning indicator in the instrument cluster.
  • The anti-lock brake system is self-monitoring. When the ignition switch is turned to the RUN position, the anti-lock brake control module will carry out a preliminary self-check on the anti-lock electrical system indicated by a three-second illumination of the yellow ABS warning indicator in the instrument cluster.
  • During vehicle operation, including normal and anti-lock braking, the anti-lock brake control module monitors all electrical anti-lock functions and some hydraulic operations.
  • Each time the vehicle is driven, as soon as vehicle speed reaches approximately 20 km/h (12mph), the anti-lock brake control module turns on the pump motor for approximately one-half second. At this time, a mechanical noise may be heard. This is a normal function of the self-check by the anti-lock brake control module.
  • Pedal pulsation coupled with noise while braking on loose gravel, bumps, wet or snowy roads is normal and indicates correct functioning of the anti-lock brake system.
  • Warning Lamp Indicator
    The anti-lock brake system (ABS) uses the yellow ABS warning indicator to alert the driver of a malfunctions in the ABS.
    The yellow ABS warning indicator will come on to warn the driver that the ABS has been turned off due to a symptom that exists in the ABS. Normal power assist braking remains but wheels can lock during a panic stop while the yellow ABS warning indicator is illuminated.

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    Please report back, I am curious if that is what it is. Good luck

    Mar 03, 2009 | 2003 Ford Explorer

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