A4 Cabriolet intermittent ABS Fault

[Steve C]

Hi,

I recently brought an Audi A4, Petrol, Automatic, Cabriolet, 2005. 

I have been struggling to clear an intermittent ABS fault. When the fault is active I have scanned the car and the fault was the left front wheel speed sensor. I replaced this and the fault is now less frequent but it still happens. I waited until the fault was active again and rescanned the car and the same fault the result. I can reset the fault by turning off/on the ignition

Does anyone have any idea what to do next?

Cheers 

Steve  

[Steve Q]

As you've had the sensor replaced. I'm wondering if it's the wiring that's come loose?

[Magnet]

Hello Steve C,

Not sure about the set up on the front, but the rear (ABS) is often signalled by a weak magnet built into the hub, and it is this rather than the sensor itself which can be at fault. Similar set up with speed sensor? 

Kind regards, 

Gareth. 

[audia4b5kev]

clean the  end of  strobe  bit   and the abs  ring  bit muck  gets in some times      

[Magnet]

All wheels Kev? Very often, ABS rings as such are not used. 

Kind regards,

Gareth. 

[audia4b5kev]

yip  all them     

[Magnet]

But surely, good diagnostic equipment will detect which is the offending wheel, and save you removing all (in caps) the sensors - with a high risk of breakage.