[SteveSarre]

Hi all

Reporting back.

I had recently fitted a new Clutch Pedal Position Sensor but it failed after a week or so.
I couldn't take it back to the supplier because I had had it on the shelf for a year or so.

ETS light was on.
Performance seemed to be down.

I measured the extended and compressed resistances and they were out of acceptable range (which triggered the ETS light).

I took the sensor out, measure the supply voltage (5 volts as expected), cleaned the tracks, but that didn't change the resistance.

I then drilled a small hole in the casing and soldered two thin wires to the connector pins inside the casing. Then I soldered a potentiometer as a variable resistor.
Setting the potentiometer to about 7k ohms brought the track back into range.

Plugged everything back in, cleared codes and car is running the way it should again.

I did a test run with hard acceleration and compared before and after:

With faulty CPS
Max turbo control valve duty cycle 49%
Max boost pressure 1460 hPa
Max mass air flow 520 kg/h

With fixed CPS
Max turbo control valve duty cycle 100%
Max boost pressure 2550 hPa
Max mass air flow 1020 kg/h

Much better.

Hope that helps,
Steve