Locopor

2003 A6 2.7T
Ok, I got this car with 24k miles on it. I'm doing 12-14 mpg city and 18 highway. Took the car into the dealer and here is what they said on the service report:

" No vacuum leaks and fuel trims right in range. Only System fault found was for Bank 1 sensor 1 02 sensor. "

They are telling me that if the computer does not give them a code they "dont" know what the problem could be.

So to all you 2.7T drivers out there please give me some answers to these questions:


Have you experienced this problem in your car?

Have you fixed it, what caused the problem?

Any ideas on what could it be?

BonanzaMan

Could have to do with the bad O2 sensor, or perhaps a bad/failing temp sensor

quickaudi:STFA

all of your problems. Replace all of them and your worries will mostly go away.

Might want to check for boost leaks (again) and replace your air filter while you're at it. I gained 2 mpg from a new air filter.

paulroad

the don't know haow to truly diagnose. they only know how to scan and replace.

Go to the forum nearest you home and ask for an audi save indy shop.<ul><li><a href="http://their">http://their</a</li></ul>

VelocityS4

Yes, a bad primary o2 sensor will kill gas mileage. I've expierenced the problem in the past.