Audi A4 B6 Back Lights

Having a strange problem with my Avant, and I’m hoping you guys can offer some advice!It’s a 2004 A4 TDCi Sport Avant, (non Quattro) and I recently bought a genuine set of RS6 18” alloys for her.Put the rears on, and went to put fronts on to find they were nearly flat. Drove to garage to pump them up, and the ABS warning came on along with ESP saying there was a fault in the system.

• Audi A4 B6 Backlights

This has never happened before, and only after I put the 18” alloys on the rear and had the standard 17” alloys on the front. Will this short drive with different size wheel on each axle confuse the system?The only other thing I can think of, is I had to use a bit of force to get old wheels off as they were tight on and wonder if I’ve damaged something?Any ideas?Cheers. Hi All, I have recently bought a A4 Cabriolet 2.5TDI V6 (100,000 mileage, 2004, 2 cambelt changes) and within a day the car fails to start intermittently with the flashing PRNDS! The dash illuminates the ESP and ABS lights and the engine will crank over but the car fails to start. I have to either keep taking the key in and out until the flashing PRNDS goes back to normal (which can take between 1-30mins) or I have to wait about 10-15mins after which the car will usually start. It is definitely a sensor issue as when the car starts, it drives perfectly and there are no mechanical issues or noises.

Audi A4 1.8T (B6) 2002-2008 Technical Articles Audi A4 Third Brake Light Replacement Pelican Technical Article: Audi A4 Third Brake Light Replacement. The third brake light on the Audi A4 sedan is located in the lower rear window and is only accessible through the trunk.

The worst thing is the car cuts out suddenly whilst driving and this locks the steering and ESP and ABS lights come on and the flashing PRNDS comes up on the dash after which I could be stuck for upto 20-30mins!I have taken it to an Audi technician who found a major fault which was the Crank Position sensor (g28 sensor) which I replaced immediately and also carried out full service as this was due. Problem still persists and technician is baffled as to what it can be! He is sure the gearbox transmission is fine and doesn't think it is the fuel pump but not certain.

He has a hunch that it could be the throttle valve but there is no loss in performance, no juddering in D, no loss of reverse, idles perfectly, no excessive smoke. I'm at a loss as to what it can be and do not feel safe driving the car. Nor do I want to throw money at the car without knowing for sure what it can be.

The brake light on the gearbox doesn't illuminate when this happens and the brake lights remain on constantly whilst the flashing PRNDS lights are flashing.The car has full service history but should have had a gearbox oil change 20,000 miles ago. Mechanic does not believe this to be the fault.Any help would be appreciated. Get a diagnostic done with VCDS/Vagcom.You should have fault codes logged if the PRNDS & ESP/ABS warning lights have been on.It's important to change the ATF & filter on the autos at the correct intervals as old ATF will cause problems. Also there are known issues with the Audi multitronic auto, & if that's what you car has fitted prepare to spend £££££££££'s.Another thing worth checking.There are 2 water drain plugs in the Plenum chamber which get blocked up so check for water ingress underneath the Battery & Servo. The ECU is also located in that area & the seal is also known to fail & cause all sorts of electrical chaos if water gets in there. VCDS showed 3 intermittent faults:Hydraulic Fuel pumpThrottle valveWater Temp sensorThese were cleared by the technician but reappeared, he is not sure what the issue is and stated the gearbox ECU is fine and has trouble connecting with the engine ECU when the problem occurs because the engine ECU shuts down.

Audi A4 B6 Backlights

It doesn't allow his VCDS to connect to the engine ECU either when this happens and said that these old engines are outdated and if it was a newer engine it would have connected.There was no codes linked to ESP/ABS or transmission, which is what confused the technician.Do you think this issue can be fixed if I change the gearbox oil or is it too late for that? I wasn't aware of the intervals until I purchased the car and had this problem. I would check out the 219 relay located in the ECU box. This is the main relay that provides power to the ECU.They do go intermittent and can cause issues. Especially if you have had water leak issues.An issue with this will stop your car dead, you wouldn't be able to talk to the ECU because it would have no power. The loss of power would cause several different fault codes related to the engine.You can take the top of the relay and check for dry joints corrosion. The relay is located under the ECU.If this is your issue I would sack your Audi technician.