I wonder if anyone knows what these codes are? I think it relates to the potentiometer for the xenon headlights

recently had a lot of power issues caused by the firewall pin being corroded

 

Ever get this resolved, op? Getting this with my 997TT. Unable to clear codes. PIWIS seems to show steering angle sensor working fine (can read the realtime data and see it update as I turn the wheel). Also tried the PIWIS steering wheel calibration process and it succeeded without issue.

Considering it says front and rear, I thought this meant the angle sensors on the control arms -- replaced them, no difference.

 

hello

Porsche was unable to diagnose this problem and wanted to fit two new headlights and both potentiometers

I resolved this myself by changing the stepper motor for headlight levelling within the driver side headlight assembly

I had a red herring at the time as I was also chasing a bad positive terminal which proved unrelated

I believe this error can indicate a fault in either headlight levelling motor

The replacement part was £219 from Porsche and did not require coding

after install and clearing the fault codes the error never returned

I was unable to find this issue initially as my headlights did auto level while I was having the error, however I did notice that when the battery was disconnected and reconnected
the first time I turned to accessory and the headlights were turned on
they levelled, however the driver side was too high

as soon as I drove the car level corrected itself even with the faulty motor.

 

Thanks for the update!

Same deal here -- I ran through the procedure to make the headlights dip down on startup (turn on headlights, then turn on igition) and they do dip down, but perhaps not enough or they're just giving a bad signal. Replacing the motors was next on my list, though it is odd it said "front" and "rear" for the codes... but perhaps it should really be right/left.

Looks like part # 99763114100, which is $154 from several Porsche dealer parts places online and $175 from ECS.
Mini-rant: I've found this to be pretty common these days - looks like the big online parts retailers are taking advantage of the typical belief that they'll be cheaper than the dealer for parts, but now they almost always are not

 

Hi just to confirm

when it was my driver headlight stepper motor only

I had error codes for both front and rear potentiometers

that isn’t the correct part for all models
some have 3 and some have 4 pin motors

mine was a newer model that had a 4 pin connector

the reason I know this is because I myself ordered from ecs and it was the wrong part, earlier 3 pin

it was listed on ecs as being correct for the car

no idea what the difference is

I would run your vin with the Porsche dealership or check what you have in your headlight before you commit to buying