Update -

Thanks for the suggestions and empathy...

Auto Zone ran a Audi scope and came up with a Code #P1136. Their print-out didn't list the Audi A-4 as a car option, but under Volkswagen included...

Definition:
Long Term Fuel Trim Add. Fuel B1 System Too Lean

Explanation:
Failed MAF

Probably Causes:
Low Fuel Pressure
Vacuum Leak on Engine
Failed HO2S

Still could use some suggestions from thoughtful forum members...

And from earlier post...

HELP!

1999 A4 1.8T 5 Spd. Quattro 120k

CEL [Snap-on Scope] #1136

Confounding problem started with CEL and engine wouldn't hold basic idle after filling tank. After manually keeping revs up and driving for a few minutes, standard 900 rpm idle settles in and runs like a clock until next tank of gas.

That was 3 Months and several thousand $'s ago. My favorite [and usually very good] mechanic is now quite stumped and I am out of dough.

Replaced thus far:

Fuel Filter
Mass Air Flow Filter
Turbo
Fuel Pump

Car runs a bit better overall [thanks to a bunch of brand new parts], but initial symptoms still in play...

Any thoughts and suggestions would be greatly appreciated...even someone with a Audi-specific scope who can help translate Snap-on Codes to Audi Codes? Is that even possible?

A good ride that is teasing me right now...

Wrecker Out

Screw the snap-on codes. Just go to AutoZone and have your ECU scanned for free. Don't necessarily trust the definition of the code that they give you though - bring the codes home and post them here and search them out on here. I had a code for a bad passenger side cam sensor, and it told me it was a driveability error - maybe not incorrect, but not really correct either. Have the car scanned there, search your code here, and you should find what you need.

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99 2.8QM

"I've always kept an open, honest relationship with my daughter. Maybe that way she won't fall for the same sh*t her mother fell for." Robert Schimmel

I bet it's a $20 part.
This is what I hate today, no one knows how to diagnose or do hands on check on things, they just read a code & throw money at it.

I would test & replace the coolant temp sensor.

Why did you replace the turbo? Tell you tech to purchase a $250 Vag-com if he wants to work on Audi's!

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2005 Lighting Yellow Lancer EVO 8
2000 Audi S4 Imola Yellow
1997 Porsche 911 C4S, Black