check engine codes ?

My check engine light was on and I had a shop run the error codes which are as follows P1136 bank one & p1138 bank 2 sys lean. Also have P0441 and P0455. Any suggestion as to where to start checking these issue?

oops forgot to mention it's a 99 A6

look for a vaccum leak, that is what the problem normally is. By the way is it a 2.8 or 2.7T

Thanks Ted, I did check the vac lines the other day but did not see anything obvious. I will be looking againg today.

what kind of motor is it, i can tell the places they normaly wear out....

ted, its a 2.8 quattro any help would be appreciated.

Thanks

com2255

You're may not be able to "tell" if they are wearing out. You're better off just replacing them. The dealer should sell vac hose by the foot. A better alternative is to go to a porche dealer and buy theirs (3mm If i remember right). They last longer than the Audi stuff.

Thanks I will consider doing that although the hoses look like new. I have also thought about the purge valve being stuck open which may cause the lean condition (P1136 & P1138) and also the P0441 (incorrect purge flow) as well as the P0455 (large leak detectede mmission control system).

I also failed to mention that after feuling the car is difficult to start. It will crank and sputter to life only after feathering the gas pedal and getting the rev's up for about 10 to 15 seconds. I'm thinking this could also be a lean condition created by a malfunctioning purge valve.

Any comments on these thoughts?

com2255

Well without the car in my sight, i would say that you are on the right track. Let me know how it turns out. Ted

I replace the purge value ($140.00 from a local Audi dealer) took about 15 minutes. Went back to the shop and cleared the codes. I have about 25 miles on since clearing the codes and so far so good. No CEL yet, may have solve the problem. I'll post again if it comes back.

Thanks for the help it greatly appreciated.

Just registered to this forum and read this thread on com2255's question.
What I would like to find out is: did indeed the purge valve fixed those problems, like P0455 and the very diffucult starting after re-fueling?
I have an 98 A6 with identical symptoms (85K miles).
Just got the car back from the shop. They replaced the MAF and Carbon canister, plus a load of other non related parts, to clear the P1136 & P1138 codes (sofar seems to be fixed?). But last night I fueled up the car and the starting problem has remained. Plus when I got home I checked the codes with my VAG-Com to note that P0455 was back.
I already replaced the gas cap a few weeks ago. The CEL is not on (yet), but I'm sure it will be in the next few days, after the EVAP has failed twice. BTW is there a way to initiate the EVAP test (code 071) on the VAG-Com, so I can try to diagnose (or listen hopefully) the leak during the test. When going to "Basic settings" it will sometimes 'open' the reed valve and turn test "ON" but then nothing happens futher with the testing. Or is this test only performed during driving conditions? I also own the Benthley CD, but there it is suggested to test the system under a slight N2 pressure. Any other suggestions?

I realize this is a long drawn question, but then again I've been looking for a fix since months on different forums. )-;
Any help is much appreciated.
FixA6