I read your solution about the A6 AR pump and I like it. I have a 2001 model too and have just replaced the left hand front bellow because it had a split in it and once fixed discovered that the pump is also not working at 100% efficiency.
I live in South Africa and the dealers pump price is R14000 which equates to about $1400 so I'm desperate for an alternative.
You mentioned in your write up that you used a merc pump with a few modifications. Can you tell me exactly what the pump is called so I can search for it on ebay or the net.
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secondary air pump for emissions is gone you can replace it or get it rebuild bearings inside get water into them and make the bearings go i had a guy rebuild mine it works perfectly. this is the guy i had rebuild mine he is leit and is more than willing to go above and beyond to help you if it has problems after it is fixed http://www.ebay.com/itm/Audi-2-7T-A6-S4-Allroad-secondary-air-pump-repair-/261545230113?pt=Motors_Car_Truck_Parts_Accessories&hash=item3ce54f7f21&vxp=mtr
this can either be a bad cat or o2 sensor its the after cat downstream driver side you can either replace the o2 sensor or buy a spacer from 034 Motorsports to get rid of this problem or get a tune alls it does is checking if the cat is there for emissions will not effect gas mileage. Owner of Audi A6 2.7T 2001.B2 S1 is drivers side pre cat
B1 = Passenger side
B2 = Drivers side
S1 = Pre cat
S2 = Post Cat Example s1:b1
For 2003 Audi Allroad the fuse box is located on the left side of dashboard behind a plastic cover (for left hand steering wheel vehicle). On inner face of the plastic cover you will find the fuse diagram. Fuse no.# 33 (15A) = Cigarette lighter (for front & rear sockets).
Typcally caused by one of the front oxygen sensors or a bad ground associated with these sensors.Replace both front sensors with direct fit type NOT universal, because there may be a cracked wire and the universal sensor does not contain the complete wire harness. Direct fits, are about $20 more than universal fit type.
The O2 sensors have integrated heating elements that bring them up to the proper operating temperature. Code P0431 indicates that the O2 sensor on your driver side catalytic converter is not reaching the proper operating range. The O2 sensors are usually in the $150 range online.
jack the car up saftely then take the wheels off .. then you will see the brake calipier turn the wheel towards you so the calipier is facing you . at the bottom of the calp you will see a small bolt at bottom undo this and lift prize the calp up then remove 1 pad the inside on where the piston is then put calp back down and put the bolt back in just to hold it in place then when you have done this put a large stronge screw driver in via hole in front to push the piston all the way back but make sure you do the evenly and piston goes in straight or it will get stuck same with all types of brakes. once you have done this reopen calp and take the other pad out clean all area with a wire brush and replace the new pads in place,, and retighten bolt etc , before you start the other side please make sure you pump brake peddle until it goes hard again. then do same to over side ,
Not 100% sure on yours but normally you'll either have a couple of bolts way down under seat cushion at front, near floor, or in some cases, you have to push seat cushion back toward rear window, hard & lift, to pop it out of notched catch under it.
I have a 2001 Allroad that had the suspension pump that continued to run, become quite loud and then it failed to keep the car at level one. This all started while under warranty but it finally failed outside of warranty and we all know that Audi denied any coverage but they offered to do the work for $1500 for a new pump and installation. I am quite handy and looked into this pump and any type of replacement parts and I found a way to replace the pump for about $350 new if you have a bit of time and are a little handy. The pumps are not made by Audi, nor Continental as the label on the pump states. They are made by a company that makes the same pumps for Range Rover, BMW, Audi and Mercedes as well as others. The pumps are the same except for the exterior mounting plates and air hookups and wire plugs. These are minor. You can find the pump for a Mercedes for $300 on eBay or approx $425 in the internet. The mounting plates on either end of the pump are swapped out in about 30min (2 strange screws on one end, drilling out 4 small rivets on the other and replacing with 4 small screw/washer/nuts). The air hose inlet/overflow and output may be different depending on the model but metric nylon quick connect fittings are available at McMaster for about $3-$8 depending on how many you need. You also may need to swap out the Audi Wire plug connector, wire crimps and heat shrink tubing. I found out a good deal about these pumps and their specs. The pumps are all similar except for their brackets and connectors to your vechile. Oh, you also have to screw in your temp sensor to the new pump and plug it in. I spent a week learning about these pumps and taking it apart. I would be happy to answer any questions you may have.