stv

Many thanks to all who who replied.

Ok so latest update today is I have put approx 100 miles on to my cayenne since cleaning both maf sensors and clearing faults. I also fuelled up with shell v power to give peace to my mind over the last batch of inferior supermarket fuel I added and 100 miles later no cel has come on and vehicle appears to be running perfect. Now call me paranoid but I just cant help thinking this cel light is going to come on again. I'm sure the cleaning of the maf sensors has resolved this running issue though and hope it wasnt coincidence. One thing I cant figure out though is that if cleaning the maf sensors has resolved this then could these previously dirty sensors also have been the cause of the other codes p1145 & p0234 previously getting triggered?

Thanks Wizard. So far i have now cleared the fault codes and turned off the cel light. The vehicle does seem to run a bit better but i have only had it on a quick test drive for a couple of miles. I'll have it out today for a longer drive and see what happens. I have not sealed up exhaust yet but I will. The exhaust does seem to be excessive smoke and is white in colour. The oil is normal colour so nothing abnormal there. I'll update again later today after driving vehicle for a while longer and see if this cel comes back.

Ok, so today I had both MAF sensors out and cleaned them with maf cleaner. Reinstalled and engine still runs like crap. I didn't even try taking it for a test drive as when it was idling i revved it hard and it sounded very rough. As well as that the engine revs would not go above 4000rpm whilst in park and with my foot hard down on accelerator. Does this lack of engine power narrow down any of the likely places I should be looking for the problem? I still have just under half a tank of fuel of the 95 octane and have not changed this out yet. Does anyone know if it is possible that the knock sensor on my vehicle may be knackered (technical term) and if it is knackered its therefore unable to alter the timing to suit this lower octane fuel resulting in the terrible running engine? One other thing I will mention is that there appears to be a leak from both exhaust pipes about half way along the underside of vehicle. This leak is coming from the joint of the two pipes directly in line with the front doors. Strange thing is when I started the car I could clearly see exhaust gases escaping from the connection flange on both driver and passenger sides along with some water or condensation dripping from the joint but after the engine had warmed up for a while this seemed to stop, hmmm is this normal? Or should I be looking to remove the connection flange and seal properly? I really don't want to have to book this vehicle in to my local Porsche centre so some more advice from anyone would be great.

Thanks Wizard, Ill try cleaning both sensors and see what happens. Watch this space for update.

Thanks for your help. I will try adding the higher octane and report back with outcome.

Thanks for the replies to my thread so far. The octane I have in tank at moment is 95 and the vehicle handbook does state that vehicle is run at optimum performance on 98 octane however a minimum of 95 octane can be used and the vehicles knock sensor will adapt the timing to suit. Is it possible that the knock sensor is knackered? I'm considering draining what is left of the tank and refuelling with higher octane as mentioned to rule this out. one thing I did notice was excessive smoke from the exhaust.

I need some desperate help here with my 2003 Cayenne Turbo. I usually run this car on super unleaded 98 or 99 octane and the other day filled it with standard 95 octane. Around 70 miles after filling up the car started running very rough to the point that i thought i was going to break down. the vehicle had no power and the transmission was jumping around between gears not knowing which gear to remain in. there was also quite a loud kind of slapping or knocking sound coming from what I can only assume is the transmission. I came to a hill and could hardly even go up it and could only drive like 10mph. I was convinced that this lower octane fuel has upset something The vehicle has 66000 miles on her and has just had oil change, filter change, new plugs and coil packs. The cel light was on so i checked for codes and pulled up the following: P1145, P1155 and P0234. Now prior to all this happening I did have an issue with a vacuum leak somewhere that was causing the cel to come on but could not find a leak anywhere. The vehicle is now almost undrivable and I would really appreciate any advice on what to look for here. I did also add a treatment of octane booster to the remaining half tank of fuel but no noticable difference to report.

Glad you have had complete success with your product. Can I ask you, What were the problems you experienced with the Durametric? Would it connect at all? Or would it only read parts of codes? interested to find out more.

Running a smoke test for vacuum leaks requires a smoke generating machine and attachements: These devices produce a very small stream of smoke that passes through small wand attachments that can be run along vacuum lines and connections while looking for the smoke stream to suddenly disappear, indicating a vacuum leak. Unfortunately, these systems are not inexpensive, but can sometimes be rented. Thanks, does the cayenne 4.5 turbo have a test port anywhere fir connecting the smoke machine? Or is it just a case of pulling hoses one at a time and testing? Neither, running, the smoke machine generates a thin plume of smoke that passes thru one of the attachment's that is slowly moved along the vacuum lines and connections until you see the smoke get sucked in. And before you ask, yes, smoke tests are time intensive. Thats great info thanks. I was under the impression it had to be connected to a hose whilst the engine was turned off and looking to see where the smoke escaped from. Thanks renntech.

Looks like its going to be a durametric for me then.

Running a smoke test for vacuum leaks requires a smoke generating machine and attachements: These devices produce a very small stream of smoke that passes through small wand attachments that can be run along vacuum lines and connections while looking for the smoke stream to suddenly disappear, indicating a vacuum leak. Unfortunately, these systems are not inexpensive, but can sometimes be rented. Thanks, does the cayenne 4.5 turbo have a test port anywhere fir connecting the smoke machine? Or is it just a case of pulling hoses one at a time and testing?

I have a p2177 and p2179 codes keep coming up in diagnostic and therefore assume a vacuum leak. I have had a visual inspection of hoses in search for cracks or breaks but so far have been unable to find anything. I would like to do a smoke test to see if this will show up the source of the leak and therefore would like to know the procedure for testing if anyone knows?

The actual scans i do on the DME are no problem and will connect and pull the codes from this without any problems, its all the other items that the manufacturer states it reads like kessy, aircon, alarm, electric memory seats etc etc.

Ekstroemtj This is interesting, Are there any of the scans you perform unable to communicate with vehicles ECU also?

I would like to know if anyone has had any problems using the icarsoft i960 for fault diagnosis on their cayenne? I can read codes no problem whilst doing a scan on the DME but for most other things like aircon or alarm i always get a message saying "unable to communicate with vehicles ECU" My vehicle is a 2003 Cayenne turbo and according to the information on their website this diagnostic scanner should support this. After contacting their technical department about my issue they politely told me that I must have a problem with my vehicle which I find hard to believe. Anyway I was thinking of purchasing a durametric but I'm reluctant in case It will not connect to most of the items like the i960. Looking forward to hearing about others experiences using this.

Hi all. I have been using the icarsoft i960 diagnostic scanner to check fault codes on my 2003 Cayenne turbo. It will pull up codes for DME with no problems but when I try some of the other scans on areas like aircon or alarm system for example I always get a message saying unable to communicate with vehicles ECU. I would have thought that if there was a problem communicating with vehicles ECU then I would not manage to have pulled up the codes related to the DME. Has anybody else had similar problems with one of these scanners? I would be keen to hear of other opinions. When I emailed the technical department they told me that I must have some sort of problem with my car. I was thinking of buying the durametric but concerned that if I shell out the cash on this and it still does not connect with some areas of my car then its been money wasted. Let me know what others have experienced. Thanks.