Limp home mode

[samcaravelle]

Hi would appreciate some help!

Have been having problems with my Audi A4 115 bhb going into limp home mode. Has recently had a replacement MAF sensor and Turbo but still doing it and starting to drive me mad, any suggestions, help would be grealy appreciated.

Thanks

[megger]

Have you had it diagnosed? Do you have a fault code?

[samcaravelle]

Hi, the garage did a diagnosis that indicated the turbo had failed but I don't have the codes.

[megger]

Unfortunately without a fault code there is probably little point in anyone trying to give advice.

I take it that your car is a 1.9 turbo diesel? If so there are a lot of niggly little problems that can occur that will put your car into limp mode. A lot of garages will incorrectly diagnose turbo failure and replace at great cost when the problem can be as simple as a leaking vacuum hose.

You really need to get a fault code diagnosis. Personally as the garage has replaced the turbo then I would be going back there and telling them to sort the problem Free Of Charge.

[samcaravelle]

Hi

Will have to get those codes, Garage have agreed to re look at the car, they are a trustworthy garage.

Thanks

[megger]

Once you have the codes then post them up and someone will be able to tell you what fault they indicate.
I am guessing that you will have had codes either 17964 or 17965, which indicate an underboost or overboost condition, and lead some garages to diagnose a blown turbo.
These faults are common on the 1.9 tdi, but it is normally a simple fix when you have found the fault.

I am not disputing that your garage is trustworthy, however I would imagine that a turbo replacement has cost you several hundred pounds and you still have a faulty car. My A4 was in permanent limp mode for 6 months. A good local independant diagnosed a blown turbo and quoted £850 for replacement. I knew that the turbo was ok, and after going through every part of the car I found that the cat had fell apart and was blocking the downpipe. I decatted it and it goes like a rocket, and I am £850 richer.