A2 1.4 tdi 2001abs lights!

4lifea2

New Member
Hello guys.

I am new here and hope stay for a long time. My car suddenly when you are driving or even shem start up sometime the lights of abs and asr comes on with 3 beeps.

Sometimes the car just drives fine. Also temperature gauge stays on 60 almost all of time. Rarely goes 90 and then it drops to 60 in a couple of min.

Another thing is that ac fanner act weirdly sometime. (maybe is something related)
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Robin_Cox

Member
Temperature gauge issues with Tdi cars are very common. Thermostat and / or Coolant temperature sensor need to be replaced (my car required both). Not a difficult job.

Random warning messages can sometimes occur with a weak battery - has your battery been replaced ever? There are also a lot of minor sensor problems that can cause the ABS / ASR lights to come on intermittently so perhaps we need some more information to be able to direct you where to look.
 

4lifea2

New Member
Just checked the battery and it looks fine.

Now when I looks with VCDS on engine unit the coolant temperature seems rising when I was in idle goes 45-65° in a couple of mine.

When check from instrument (VCDS ) it shows 42° and barely moves 42 - 44.

Is there any fuse for this?
 

Robin_Cox

Member
This is a classic sensor symptom.

The coolant sensor has 4 pins corresponding to two channels that send the same data independently to the ECU (VCDS engine unit reading) and the dashboard (VCDS instrument reading). Both can fail independently - in this case it suggests that the side of the sensor that sends instrument reading has failed, so the sensor will need to be replaced if you want a temperature reading.

there is normally an error message for something like "Coolant temperature sensor, open to ground, sporadic" or similar in the instrument ECU, and maybe even in the engine ECU fault codes.

If the instrument reading is correct but the engine unit side has failed, you have poor fuel consumption because the ECU assumes the engine is cold and adjusts the fuel mixture to accelerate "heating".
 

Robin_Cox

Member
Secondly, returning to the ABS / ASR lights - my partners car (1.4i) does this sometimes when there is an air leak into the engine (oil cap loose, cracked air pipes, etc. etc. etc.) and the fuel mixture is confused, with errors such as "Intake manifold pressure sensor implausible value, sporadic". The car still drives normally, but with all of the lights on until you can stop. The ABS error reads on VCDS as "Engine ECU fault", which you can clear. Then you need to switch the engine off and on again and the error goes away. Replacing the oil cap helped.

I am not certain if you get similar faults on the Tdi - my Tdi car gave an ABS / braking fault light sequence once - I had no brake lights at all as one bulb had blown, but the car detected a brake light switch fault as a result. Replacing the bulb fixed the problem. I know the brake light switch isn't perfect but on this occasion the car became slightly confused.
 

4lifea2

New Member
Thank you for replaying.

So the coolant temperature sensor must be replaced?

And for the ABS it goes just randomly while you are driving quietly when it comes on with sudden brake and vibration at any speed.



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