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The oil cooler indeed is water cooled. I had my oil heat exchanger changed on my 2003 Cayenne turbo last December as it was cracked with oil found in the coolant system. Change it asap. Part number for the S and turbo is the same being 948 107 276 03.
That would be the fuel rail bleed screw cap.
The burnt contacts are a result of poor contact with the receptacle socket. The solution is to modify the plastic headlight plug holding bracket on the vehicle side. You cut off the ends of the retaining bracket with a Dremel allowing the electrical plug to be free from the holding bracket. You then manually insert the plug into the headlight upon installation and manually remove it when you remove the headlight. I modified mine 8 years ago and have never had a problem again with the turn signal or any other type of headlight message.
The plastic key won’t switch the battery source from front to rear. You need to use the metal blade key to enable the switchover from front to rear auxiliary battery.
If your not driving through rivers or the like and you want a long term solution, remove the plug permanently.
With a 2004 CTT, you may have aged vacuum lines that are leaking which can cause idle issues.
bigbuzuki replied to mbagge01's topic in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)I too have a 2003 CTT and have had my reservoir tank split at the seams every 90,000 km on average. If you haven’t replaced your reservoir tank yet, there is a good chance the reservoir is the source of your leak. The plastic coolant Ts were rupturing every 90,000 km as well. I’ve replaced the Ts with stainless hoping not to have them fail again. There is also the electric coolant pump for turbo oil cooling when engine is turned off that could possibly be leaking. It is situated in the wheel well. Mine has not leaked as yet.
The transmission front seal is a common source for transmission fluid leaks. The seal can be damaged if leaking coolant fluid gets to the seal. Did you repair the transmission fluid leak from the chaffed pipe that you mention in your original post?
Step 1. Repair the source of the leak. Step 2. Fill transmission to the correct fluid level. Step 3. Confirm no further fluid leaks evident post repairs. Step 4. Hope that the low fluid level condition has not damaged your transmission.
In your case with the metal dummy key substitute, ops would be the same as if your using the Porsche remote security metal key, the cranking power coming from the rear battery. You need a plastic dummy key to have crank power from the front battery. I am assuming that the sensing of metal versus plastic inserted into the ignition slot is how the system differentiates between the keys and which battery crank source to use. Have you checked the electrolyte levels and measured the specific gravity of the cell batteries?
Replace the the front battery initially as its 5 years of age. There is no battery registration feature on your Cayenne. Front and rear batteries are different capacities with the larger capacity in the front position. Do not swap battery positions. If your car is optioned with KESSY and you use the plastic dummy key to start the car, the front battery is used for cranking. If you don’t use the plastic dummy key, the cranking operation is via the rear battery.
There is a fuse that controls both the SAI relays. Check out fuse F12 (5 amp) in the engine bay fuse box.
bigbuzuki replied to thor1974's topic in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)Hold the odometer reset button on while turning on the key (you don't need to start the engine). The display will say Service Reset. Press the Reset button on the windshield wiper stalk. Reset complete!!!
The transmission switching to 1st with PSM on and holding the low gears is normal when temps are cold on initial start. This is by design In order to rev the engine higher to warm the catalytic converters for efficient operation.