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bigbuzuki replied to Sean 78's topic in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)Put it in 3rd gear and do a full throttle sprint. You should see the boost gauge read 0.8. The boost / temp sensor located on top of the intake manifold just in front of the throttle valve is the sensor responsible for sensing boost.
Read through this link.
Control lines down to the wastegate actuators do crack / split preventing these actuators from opening resulting in overboost condition. N75 valve and boost sensor on the top of the manifold are also in the loop and are possible suspects. Below post is the troubleshooting guide for P0234.
What code are you getting for the overboost? The thing on the bumper looks like some sort of radar jammer / light assembly item.
I am not getting any ECU faults appearing with my dubious cam readings on bank 2 via Durametric. Car is running well with full boost. Any ideas? 2003 CTT - 260,000km
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.