Seat Leon ' forgetting' steering calibration

[OliilO]

Evening,

I've got a mk2 Leon Cupra that has been giving intermittent electrical faults. It's had the steering angle sensor replaced and is going back to the garage for some more diagnosis at the end of the week (garage have been mega helpful so far).

The steering angle sensor was definitely faulty as it provided no input when looking at VCDS and turning the wheel. It was replaced and the steering wheel calibrated providing a fault free dashboard and no errors on VCDS. If the car is driven and then left for a short time, all is good, but after leaving it overnight it seems to forget its calibration which then throws intermittent ESP and steering fault lights.

Anyone had experience of this before, or any suggestions of likely causes?

[lemonslap]

How old is the vehicles battery?

[OliilO]

That was my initial thought, as I've not changed it during the 3 years I have had the car and have heard they can be sensitive to voltage drops.

What form would calibration details be held in? Surely that would likely be held in the ecu in a format that isn't affected by disconnection of the battery etc or would have some sort of internal hold up memory to stop it forgetting settings/coding?

[Jonwm]

I go on seat cupra.net full of good info on the Leon's, loads of clued up people, I've always found out my problems and fixes, had 2 Leon's now

[helix402]

As the other post says, a weak battery on these can cause steering angle faults.