Few weeks back, was driving car, parked at a store, then couldn't start, nothing clicked whined, silence.
Since autozone was near, got them to bring large battery and boost car. Success.
Note that I remember playing music loud around that time, voltage on cluster showing in 11 volt range.
After boost, no issues.

Yesterday drove car home from work, mo problems. Parked. 30 mins later car wont start. Same scenario. Co clicking or noises. Jus thg wont crank.
Note again, I was playing music loud on way home.
Tried to boost with minivan batt. No go. Wont crank either.
Been told if batt is dead, boosting from other car may not help.
Advice appreciated. Need this fixed asap.


I got to testing it all after car would not start. Some weeks ago, tested battery and while running it was showing about 14.xx Volts. so thought it is all ok.
Yesterday, all I could do was volt meter across terminals of batt. Reading 12.75V or so with car not running at all.

I brought home brand new battery. Connected, still not starting. How do I know if this is starter or alternator? I get no sounds trying to crank engine even with new battery. Instrument cluster reading new batt voltage at 12.4V. DMM across terminals reads 12.75V with nothing connected.
Need help. Calling tower to take to shop for fixing would be capitulation. I do not like that.

 

I know this sounds crazy, but try this.... Pop open your hood, pop open the oil cap... wait 30 seconds...... add in a smidge of oil, put oil cap back on, close hood and try to start car again..

 

you may have a bad oil level sensor which would cause this same exact symptom i had.... If the car starts up again after adding a little oil, then you know its a oil level sensor.... this has happened to me before.

 

ouch, that is a bizarre one! but good info!

 

Hmm.
Day before, I was down one square from full (250cc), added little less than 500cc, since it was at one square less for a while already. The level would be full after the add.
Do you think adding to top up may have something to do with this? How do i check? Drain some?
Never heard of such behavior with oil but would love to fix.

 

As stated, latest update is got brand new batt, 1000cca, replaced old batt. Still no start.
At this time I get no noises with new batt when trying to start, no cranking, etc.
Put old batt back in as not batt issue. Next thing I can think of is only starter.
Can anyone comment? How hard is it to remove intake to get to the starter?
Genuine starter about 200 bucks new, I did coolant pipes on 06 cayenne turbo, but panamera engine is closer to the 2012 cayenne engine.

 

The reason I bring this up is because when the sensor starts to act up, it'll still "show" an oil level, however, it may be reading incorrectly. When it hits a certain threshold, it will do this weird thing where it seems like the car has some kind of issue wit the starter or battery... and I promise you, it wont be either. When i mentioned about adding a smidge of oil, i meant as in add in about 2 ounces of oil to see if that will trigger the oil level sensor and completes the circuit to start the car up again... For now, just see if adding the oil will trigger the sensor to allow your car to start. That amount you put in wont be damagiing at all. If the car starts right up, then I can safely say that its the oil level sensor.. I know, its weird and I had the exact symtoms as you did with a brand new battery before that as well,

 

the adding of oil will touch the sensor head tip and will detect a complete circuit... then you'll be able to start the car.. I think there is a safety mechanism with the sensor where if it detects Zero oil, it will shut down your engine and/or not let you start it up.

 

The thing is oil was showing full day before on cluster except one square (250cc less). So was not empty. Oil is not leaking on my car so it is in engine. I could lift back of car to cause oil move forward and appear over filled but doubt this is reason. If I saw empty oil reading maybe, but I saw almost full oil, and added to top up. That would not explain car not starting due to no oil.

 

Thats the thing, for me, it all started when the car wouldnt start... Then it started again, checked the batteries, and everything and its all good. Checked the oil level and it showed only one bar down, so i did exactly what you did and put in about 1/4 of a quart of oil.... Drove around for another 10 miles and the car stalls in the middle of driving... Popped the hood, opened up the oil cap, and the car was able to start up again. Drove another mile before it stalled again.... Looked on the cluster and oil shows full... but decided to add in a another 1/4 bottle of oil, and the car started up again... engine idles a lot smoother..... when the car wont start, you wont even get a buzz or click or any crank over sound at all... TRUST ME on this.. its the weirdest thing

 

I just went into the garage, did just as you said - added 250cc oil into engine. Tried to start. Nothing.
I do hear one or two slight clicks from under engine (I assume possibly from area of starter), but nothing, not even attempt to crank.
Used a jack to lift the front up (front driver - where oil level sensor is), and still nothing. Same behavior.
So oil level does not do it for me.
Ideas what it could be? Am I correct its a starter? What if alternator (it charges bett, so has not bearing on starting and I already had new batt in, which did not start car, so I assume alternator out of picture here).
Hope my logic is correct - starter. Let me know what you think.

 

Awesome! So then you are down to Starter or starter circuit!

 

Already checked all the relays and fuses. Nothing blown. All in working order. Could not actually pin down which one is for starter but checked them all, left, right and in trunk.
So that is why I assume starter. Hoping my logic ok.
Trying to find places that show taking off the intake manifold on turbo panamera.

 

Which includes checking the entire power and grounding wires to the chassis. Check the starter relay, fuse, and whatever else is connected to the starting system such as the PCM