Porsche Repair Questions? Ask a Mechanic for Answers ASAP
Hi, I am Mike, welcome. I'm reviewing your question.
That has electronic power steering, so to begin, check that fuse, the fuse #49 in the fuse box under the left side of the dash.
Are you saying that also the engine will not start?
The engine is locked up?
Do you mean it is actually locked up (seized) or that it simply will not crank over while using the starter or that it does crank over but doesn't start?
When you turn the ignition key to start, does the starter crank the engine over, yes or no?
Ok, great. Now when you turn the key to start, can you hear a click sound or clicking sound?
If your answer is no turn on your headlights and go out and tell me if they come on and if they are bright, dim or out?
Ok, leave the headlights on and also turn on the dome light so you can watch the dome light as you turn the key to start. now turn the key to start and let me know if you hear any click or clicking and also what that dome light does. It will do one of 4 things, 1 is just stay bright, 2 is dim heavy but still stay on, 3 is go out completely and 4 is dim slightly. What does it do and do you also hear a click or clicking?
Ok, great now what did that dome light do when you turned the key to start? remember I said it will do one of 4 things.
Ok, stay bright and also a click. That tells me although the starter relay is most likely what is working that 1/ of it is working so it must be the other side. One second while I look at which fuse to check.
Do you know what engine is in this?
Great, check the fuse Z1 in the main fuse block, it's a 250a (amp) fuse.
Ok, there are more to check. here is the wiring diagram just for reference.
I have to ask, do you have a voltmeter or 12 volt test light?
Also, can you put your finger tips on that starter relay and feel if it is what is clicking when the key is turned to start?
Now, for the next fuse to check, the fuse #7 in the main fuse box.
Yeah, I know that but it appears you have other problems and I am just trying to get the engine to start first.
No starter working either which was what I was trying to figure out. Why did you quit?
Ok, then where were we?
Oh yeah, how was that fuse #7 in the main fuse box.
What? I thought the starter would not crank the engine over?
A problem with the steering should not prevent the starter from working and the engine from running.
I am just going to opt out cause I am having a problem understanding the symptoms.
I guess Mike wasn't aware that Porsche uses an electronic steering lock assembly as part of the anti theft system. I know multiple manufacturers who use a similar electronic lock as well.
First thing to do would be to attempt to turn the steering wheel left or right to see if it clears. If it does clear make sure not to turn the vehicle back off until your at the garage/dealer that you use as it very well may not start again.
Second thing to consider is the battery, a bad battery will cause steering fault faults like you mention.
If the battery is not suspect then it more than likely is the electronic column assembly which can be a bit pricey depending on options (memory etc)