Hi

I have a 2004 audi 1.8t quattro but am having problems with the engine light which keeps coming on.

Based on the VAG Com it first threw up the lambarda sensor which I changed then it gave me codes which related to Coils 1 and 2 which i also replaced.

Now I am getting the code 17705 - 'pressure drop between turbo and throttle valve p1297 upper limit reached'

I then cleaned out the throttle body but still have the same issue. The car idles a little rough and it seems to be drinking alot of fuel. I have also changed the coolant temp sensor and spark plugs.

I also checked the MAF sensor by unplugging it but it still idles rough so I dont think this is causing the problem. The previous owner had already replaced the dumpl valve and I had a local mechanis check for air leaks via a smoke test but there were no signs of a visible leak

Can anyone help? I am running out of ideas and cash