Recurring VAG.COM errors

[toasty]

Hi,

Keep seeing DTC 17545 and 17547 when I scan for DTCs on my Audi S4 1999.

They relate to actual errors of:

Long Term Fuel Trim Add.FuelBank1 System too Rich
Long Term Fuel Trim Add.FuelBank2 System too Rich

I've cleared them before and they come back within a week.

Any ideas anyone?
-Dan

[PhilT]

I'd speak to whoever did your remap. Let us know what you find out.

[Bushy]

i dont think toasty has had a remap yet

but maybe a previous owner

or maybe a warranty job?

[PhilT]

You're right Bushy.

Modifications: None

My bad [img]images/graemlins/blush.gif[/img]

[toasty]

Hi chaps,

thanks for you interest.
No remap just yet (as far as I am aware)

I guess the rolling road day will show if it has been modified, but I doubt it as it was a company car before I owned it.

[Doug_RS2]

Could be a dirty MAF - so it's reading airflow wrong - Can you log the data for the fuel trim - Is this in the spec range? I've only played around with VAG-COM for a few days and it's for an S2 so it will be different. If you have an oiled filter it can easily cause this.

[toasty]

Hi Mate,

Just recently cleaned the MAF, and it was as clean as a whistle anyway.

Been looking on the web, figured that it might be an idea to change the TBB and Diverter valves anyway as they are a weakness on S4's and quite cheap I would imagine.

Apparently though if the TBB was badly broken I'd see DTC 17965 which I don't.

The car runs fine, and the error sometimes takes a week to register again, so I'm not too bothered, more of a project to get to the root of it than anything else!

Not sure about fuel trim logging, I'll check.

Thanks for the advice.
-Dan