2006 Cayenne TT - CEL error codes

[PKN]

Can anybody help narrow down the source of these error codes? My Check Engine Light is on and my Durametric unit shows the following error codes;

PBD48

PBB48

P9640

The first two indicate excessive idle speed and the last an Oxygen sensor. I would appreciate any help to narrow down the cause(s) - I am hoping it is just an oxygen sensor that needs replacing

Steve

[wvicary]

Any drivability issues? I would smoke test for a vacuum leak.

[PKN]

Thanks for the quick response. The strange thing is that I can see no driveability issues and my mileage is about 18 on a weekly 85 mile commute. Just before it started though, I had a wierd hesitation on acceleration from start which went away within a few miles. I sawe another post online with the same two "bank" codes that turned out to be the "T" connector under the air intake. I will take a look as soon as things cool down here a tad!

Steve

[PKN]

The plot thickens - a new error message "faulty brake booster" Maybe the source of a vacuum leak. Where do I start looking?

Steve

[RFM]

http://www.renntech.org/forums/topic/42048-brake-booster-warning-troubleshooting/?hl=%2Bfaulty+%2Bbrake+%2Bbooster#entry224479 Try this out!

[PKN]

Many thanks. I am sure this is where the problem is - I have had to repair this area one time before when I was changing out my air filters, I just didnt realize it was the brake booster pump. It also makes sense because I recently had to replace my coolant tank and probably cracked it again when I did so. There has to be a better more durable material for these pipes - maybe silicon?

Steve

[wvicary]

You need a ridged pipe so it doesn't collapse under vacuum, I think the factory bits are best.

[PKN]

In this case, and for a nice change, the problem pipe was where the upper hose attached to what looks like a plastic valve and very easy to get to. The other end went to the pump. I replaced the section with pressure hose (power steering). The light went out immediately on starting. I cancelled all error codes and took a 5 mile journey without error codes to show for it so fingers crossed!

Steve