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 

Hello Ian,

Have you checked this for fault codes which should identify the offending wheel, 

Could be as simple as ( and often is) a poor connection. 
Kind regards,

Gareth. 

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!

Ok. Sounds good, except why did you renew ‘sensors’ if you had isolated the issue to the sensor on o/s front wheel? 
Is the sender on the front wheel a Reluctor ring type? 
Kind regards,

Gareth.