955/957 Cayenne DIY: PSM and ABS lights - unexpected solution
 

Hi Guys,

Recently had the PSM and ABS lights come up on the '06 CTTS with the take it to the workshop recommendation.
Expected symptoms were the ABS grabbing when coming to a stop even at low speed and sometimes having a hesitation on release when driving off from standstill.
The unexpected symptom was the behaviour of the transmission:
In drive the car would no longer change up a gear unless we were headed down hill (no load?) but the car would take every opportunity to downshift even if the revs did not warrant it.
Driving in D became impossible as I thought I might cause some damage to the transmission. Driving in manual mode was fine - even quite enjoyable for a change as I have often found the the gear changes to come at very low revs in lower gears.
I owned the '06 CS for 6 years and that used to change gears at 1500 rpm which I thought quite low - the same year CTTS changes at 2000 which is better.

Anyhow, I plugged in the durametric and interrogated the PSM and ABS - No reported faults - nothing also from the instrument cluster - even though I had multiple warning lights in the cluster.

The answer came when I interrogated the Transmission - it reported an code - 1680 - RPM signal for front right wheel.

It appears the sensor in the wheel had failed and this was being used by the transmission to set change points.

Odd that the error message on the cluster reports ABS and PSM while the onboard diagnostics report Transmission.

The Porsche part 95560640610/11 costs £114 + 20% VAT in the UK but as it is the same part on VW and Audi it can be easily bought for around £35 including VAT.

The part is held in by a 6mm Allen head machine screw which, because of its placing and exposure to salt, I had to file the edges to get a spanner/wrench on.
The body of the sensor fits into a hole drilled into the suspension - this I put penetrating oil on every night for a week to no avail.

I had to drill it out and pull out the pieces with tweezers.

New part went in super easy and corrected the faults with ABS/PSM and Transmission within 50 yards of driving.

https://cimg0.ibsrv.net/gimg/rennlis...dc178f2a3c.jpg

Old wheel sensor in place
https://cimg1.ibsrv.net/gimg/rennlis...9d17260f0e.jpg

Transmission code
https://cimg2.ibsrv.net/gimg/rennlis...b7a3c61251.jpg

No Codes for ABS/PSM

What are the VW and Audi part numbers?

Phatz, The manufacturer is Ate and their part number is 24.0711-5401.3 for the left side and 24.0711-5402.3 for the right side.
The same part is listed for the Touareg.
I downloaded the Ate pdf from here: http://www.ate-brakes.com/media/1601...09_deutsch.pdf

I know it says 2009 but it is from their current website - The part actually has a VW stamp moulded into it!