Better Mileage Audi A6

[Tony Hoffman]

A failing CTS will not always throw a CEL on a VAG product. BTDT plenty of
times, in fact I have one in the shop right now. No CEL, but CTS code
present (Original black one) in ECU. '01 NB 1.8T, BTW. Wish I knew why they
are programmed that way, they should definately trigger the CEL for a
failing CTS, IMO.

However, John is definately dead on in regards to both use of the throttle
pedal and O2 sensors. Iv'e never seen one bad on an OBD2 without a code and
CEL.

For the answer to the question posted about what they should get, most of my
customers (that check) get 18-19 in town, 25-26 on the highway with the A6
2.8 30V (C5). Which is also what I got with the automatic V8Q.

 Tony
On Thu, Aug 25, 2011 at 11:13 PM, John Larson <john at westcoastgarage.net>wrote:


> If the CEL isn't on, the sensors are performing within their established
> (mandated?) parameters.  While you 'might' see some small mileage
> improvement with new ones, it's unlikely it will be much.  Gutting the cats
> serves no purpose, and will add noise and CEL related issues, besides being
> illegal.  IMO, as a professional tech dealing day in and day out with
> driveability issues, you have an operator related problem.  My '95 A6 (close
> to 300K!) gets 20-24 in mixed and highway driving, but we are somewhat
> mindful of the way we drive, and it goes away when it's used strictly around
> town.  WAY away.  If you take a longish highway trip, what kind of mileage
> to you get?
>
> John