Hello everybody I am the owner of a 2001 A4 2.8 Quattro that is having a few problems. The car is misfiring in cylinders 1,2,3 also has a code of the cam sensor being out of alignment.

The car has about 150K on the motor and I am not sure if the timing belt has ever been changed. Any response is appreciated

 

Change the belt asap

It can possibly just be the bad cam sensor throwing the misfires. Replace the cam sensor. is on the front or back of the head depending which side is bad.

 

The misfires are coming from the passenger side 1,2,3

 

Ok replace that sensor then

 

cylinders 1,2,3 also have low compression... Do you feel it might be a timing issue as well or the sensor may fix that problem?

 

If you have low compression then something else is up. It's possible you have a stretched belt or one that jumped a tooth. How low is it? As stated, do the t-belt NOW, as in within the next several miles. You're driving a ticking bomb that's just waiting to blow. Do you know for sure that the code is new, or could it be an old one that was fixed before?

Do that, then see if you still get a code. If you do, change the cam sensor. It's on the front of the head. Pop the timing cover, unplug the sensor, remove two 8mm bolts, and it falls off in your hand.

 

A cam sensor won't cause misfires, but is a good indicator your misfires are because of a timing issue. Replace the belt ASAP and try again.

 

good job Learned

 

@Lalala the compression is right around 50 when I had to checked last. The codes originally were for the O2 sensors, I had those replaced and then the exhaust had a leak which I also had fixed. The day after the exhaust was fixed the CEL went off, the next day it came on FLASHING. Since the misfires I have no driven the car, I actually moved across the country because of my job and my B5 stayed in my parents garage but I do plan on having it towed to a stealership to be worked on I just want to know what Im in for before "grabbing my ankles"

Do you feel as though this project will be cost effective on a 2001 2.8 A4 with 150,000 miles.

Any more input is appreciated

 

its going to cost probably more than you paid for the car if you take it to the dealer. Best bet, if your not doing the work yourself, is an indy shop. Possible head gasket or blown rings if your cylinders are at 50 on your compression test. Either way its going to be expensive.