Ian891

Thanks ever so much Steve!

Hi all Need a little advice I have a 2004 B6 S4 cabriolet I have an intermittent ABS ESP warning light activation I have changed the wheel sensors, brake pedal switch and the reluctor rings but it still comes up The garage I have used to diagnose has said the only other thing it could be is the ABS electronic control unit - which you can no longer buy (but was £1800 when you could!) I have been told they can be repaired / refurbed does anyone know where and how much this is likely to be - I live in Surbiton Surrey I use Volkspeed for all my engine maintenance who are excellent but I would rather cut out a third part and go direct Any one with any advice or assistance it would be incredibly gratefully received as apart from this (which drives me nuts) the car is in perfect condition to note in the last year I have replaced Full front suspension Timing chain all belts and pulleys and tensioners all discs and pads valve cover gaskets and all other gaskets all fluids everywhere wheel sensors etc full service would really appreciate some advice!!

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Hi used OEM sensors from Audi just did the from ones - the fault code still states front right sensor failure so I’m having the wiring traces checked hopefully this will resolve if so will update! no worries on the questions at all really appreciate any input in trying to resolve!

Yes it was!

The one that the wheel sensor displays the fault on

Hi yes brake pedal switch changed, wheel sensor changed reluctor ring changed ABS control unit checks carried out all showing no issues but fault is being sent to dashboard so am guessing its a wiring issue... Whilst doing this I have also changed all the pulleys tensioners and belts as I did not do these when I had the timing chain done. in the last year I have replaced Timing chain Valve cover gaskets Oil filter gaskets and oil and filters twice! (like the engine to have clean good oil depsite the car on doing less than 2000 miles this year!) Front suspension fully discs & pads all corners new pilot sports on al corners all rear light cluster wiring looms speed sensors reluctor rings all soft touch controls in !Removed! pit new headlights - bugger to find as well as the engine being completely serviced and in immaculate condition once I sort this stupid ABS ESP light issue the car will be faultless but this is a real pain to diagnose!!

Thanks I think its a wiring issue as brake pedal switch was replaced and fault remained .....

Brake pedal switch not the issue - changed this and still fault appears - I am guessing it is going to be a wiring issue

have responded to all messages

Hi Cliff I posted on both forums as essentially the B7 was a facelift for the B6 the 4.2 V8 engine is exactly the same yet there will be owners on both forums and as I am struggling with a solution I wanted to ask both owners of the B7 & the B6 - it would be good if the forum actually broke down the models so S4 owners from 2001 - 2008 would cover this off! Thanks

Hi yes fault code says front right wheel sensor which I have changed - is there a specific connection you would recommend looking at... I am struggling! Thanks for coming back to me!

Hey would love some advice I have a 2004 4.2 V8 S4 - I have an issue where my ESP & ABS light came on intermittently becoming more and more consistently on. Things I have checked and replaced Wheel sensors, reluctor ring, ABS control unit but the lights are still on - everything works but this is a real pain - anyone had this issue and does anyone have any advice I was informed brake pedal switch which I have not tried yet ... any assistance massively appreciated Thanks

Hey would love some advice I have a 2004 4.2 V8 S4 - I have an issue where my ESP & ABS light came on intermittently becoming more and more consistently on. Things I have checked and replaced Wheel sensors, reluctor ring, ABS control unit but the lights are still on - everything works but this is a real pain - anyone had this issue and does anyone have any advice I was informed brake pedal switch which I have not tried yet ... any assistance massively appreciated Thanks