brand new user....i've owned a couple of A4s an
Audi 90 and now a 2003 allroad. Just picked this car up very cheap. 165k miles single owner dealer maintained. He gave me all the records with the car. it was a good deal. 2 grand cash. I was psyched!

I just installed the Arnotts and the Bilsteins and the pump. Suspension is fine now. Runs great and has lots of power.

The bad is that the CEL is persistent even after clearing the codes.
I'm getting the following:

2 Faults Found:
17862 - Exhaust Gas Temp Sensor 1 (G235): Short to Ground
P1454 - 35-10 - - - Intermittent
17819 - Secondary Air Injection System; Bank 2: Insufficient Flow
P1411 - 35-00 - -


Now the question lies herein: When I start the car I can hear the air pump come on. It's noisy... however, it's not like the screaming jet engine type others have experienced. It's more like a noisy exhaust. Before I researched any of this and before I knew what the SAI system was for I thought there was an exhaust leak. After learning of the pump issues I pulled it, and ran leads from the battery straight to the posts. It seemed to run fine and not only that,it didn't sound noisy.


When I tried to set readiness I fail emissions due to one of the cats not getting to temperature and when it forces the SAI to come on, I can hear the pump start but then it fails the test.

After going through the dealer invoices I found that they had just replaced the pump, the hose and the valves 8k ago. I asked if they would warranty the part but told me it was over a year ago so screw off basically.

So my question is two fold: First would the valves (or something else in the SAI system)be causing the noisy "leaky-exhaust sound" that I am experiencing rather than it being the pump? And second, if I am getting the insufficient flow code, could this also be duping the EGT sensors? or vice-versa?

Lastly, when monitoring the cylinders I continually get misfires on cylinder #6. Is it misfiring because of the EGT's? Or does it seem more like a bad coil since it's only the 6th cylinder?

Thanks in advance.

 

Your SAI pump problems sound like the ones I had last year. Turned out to be one of the hoses...on my TT, it was the one that goes from the SAI pump to the combi valve. Anyway, it had minor cracks. So, some of the air pumped up to the combi valve was escaping. The combi was getting air, but not enough to prevent P0411. We repaired the hose in several places using heat-shrink warp as a new hose if quite expensive.

Misfire sounds like coilpack as you suggest. Try moving coil packs and see if the CEL follows the pack.

cheers.

 

TTQ2K2

What did your TT sound like on cold start up? Did you have a kind of throaty exhaust leak noise coming from the back of the motor?

 

Roja.raou

What are you talking about?

 

Not that I recall. I had a leaking SAI pump too so it was very noisy. I thought that was the source of my P0411 problems. Pulled it first, removed the revits (broken as well as those about to break), and replaced them with nut/bolts. Reset the cel and went about my merry way just to have the cel come back on a few miles down the road.

Before we found the cracks in the hose, we went thru the rest of the components all to no avail. It was only by accident that we discovered the cracks in the hose. So, we pulled it (broke into a couple of pieces) and put it back together using heat-shrink wrap from LOWES. I was loosing a lot of air thru those cracks/near breaks. So, my P0411 problem was two fold: air escaping from pump and air escaping from cracked hose.

As I recall, it was about $10-15 for their pack of large heat-shrink wrap. We also reinforced the wrap with tape. Has worked well for over a year, but my pump is making more noise again....no cel yet.

cheers