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richardshayes
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I had a similar experience, in the dealer major service a day ago, now I drive 20km and get the same picture as above. Its a 2005 Cayenne S. Switched off problem went away drove another 20km and the display changed again to the D with a backlit box. Spoke to the dealer and they said to come in and they would hook it up. I have the car on charge whilst I am away (which is a lot) with the porsche trickle charger and normally weak battery the 4wd indicator on the dash shows up. Nothing like that. Shifting is a bit rough and the car surges a bit on start up idle ANSWER I took the car back to the dealer ship. They ran diagnostics. It turned out the technician had not plugged on a sensor properly. All resolved now.
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This workled well on my 2005 Cayenne S using K&N filters Low end take off has improved noticeably with the 'dead' spot when taking off as the transmission sorts itself out (all porsches start in 2nd gear) The K&N filter is half the thickness of the stock filter so I did not need to pull the hose of the left hand filter. I was missing several of the snap locks that clip on the engine bay covers - I rang the Porsche dealer and they said they 'pop off' and can often be found on the top of the cover under the car - a bit of sliding around under the car and feeling for them found none - note that the engine was not HOT - I would not recommend this if the engine is hot. Running up the engine after the filter replacement gave significant induction roar (i did not try this before I change the filters) which suggest stronger and better breathing. I would recommend taking great care in seating the air boxes around the filters, but this seems idiot proof, also check the fit of the tubes connecting the air boxes to the engine particularly behind the tube where you cannot see