ABS/Tpms light/ACC/Stop start/headlight assist

[roverman1]

As my title says I had all these light come on out of the blue this morning, it's a 2015 estate with technology pack and until today it's been faultless. I used car scanner pro which didn't show anything specific but I used the live data showing all 4 wheel speed sensors and the rear right wheels graph was all over the place where as the other 3 were were steady showing the same graph on all 3. So will a faulty abs sensor also affect the headlight assist. Also these faults come and go

 

[East Yorkshire Retrofits]

Yes an ABS sensor can affect all of the systems you’ve mentioned, as can a weak battery

 

[roverman1]

I've checked battery voltage and when the car is running and everything seems fine, in fact I think the battery is bigger than what is meant to be fitted it's been on the car since we had it in 2021. I'm leaning towards this spurious reading on the right rear abs sensor

 

[SuperV8]

could also be connectors, wiring or reluctor ring - for that ABS sensor.

 

[roverman1]

Well after more diagnostics I did indeed narrow it down to the rear right sensor it was registering 0 speed when the other 3 were showing the same speed that I was traveling. So I bought a new Facet sensor for £19 , removing the old one was awkward, removing the bolt was easy but pulling out the new sensor that has been there for 10 years took some time, it can't be twisted so some gentle levering and pulling is required until it's half way out then it can be twisted gently and with the help of wd40 it came out. The new one is a tight fit but eventually I fitted it and so far all is well, I've attached some pics of the old sensor and the new facet part number for reference, the

sensor needs to be the correct one depending on whether the car has adaptive cruise or not.

 

[East Yorkshire Retrofits]

Well after more diagnostics I did indeed narrow it down to the rear right sensor it was registering 0 speed when the other 3 were showing the same speed that I was traveling. So I bought a new Facet sensor for £19 , removing the old one was awkward, removing the bolt was easy but pulling out the new sensor that has been there for 10 years took some time, it can't be twisted so some gentle levering and pulling is required until it's half way out then it can be twisted gently and with the help of wd40 it came out. The new one is a tight fit but eventually I fitted it and so far all is well, I've attached some pics of the old sensor and the new facet part number for reference, the View attachment 47507 View attachment 47508 sensor needs to be the correct one depending on whether the car has adaptive cruise or not.

All of the facelift Leon's have the bidirectional sensors installed

Prefacelift is dependent on if ACC is installed or not