Oil Pressure Light

[Jx3069]

Hey everyone, I'm new to this forum. Anyways I have a 2003 A4 which I purchased 2.5 years ago and it had 45k miles. After I purchased it I swap to synthetic oil and did my oil change every 5k with Mann filter from ecstuning. Recently my oil pressure light came out n flash whenever I drive on the highway for an extended period of time so I did a lot of research and concluded it might be sludge, I did the procedures here http://www.audizine.com/forum/showth...ghlight=sludge and after Step 1 I realized I had a leak somewhere on the left side of my car ( where the turbo sits) I havn't had time to jack up the car to look for the oil leak yet. But I finish up the flush with step 2 and diesel over night. I finished draining it after 12 hrs, did step 1 again n let the car idle for about 1.5 hr till the smoke show was over. Did a regular oil change and drove it this morning, had some misfires and smoke still but it was over pretty quickly. Car felt like normal again except one problem the oil pressure light came back on after 30 minute and also I think my turbo's dead I had a tough time in 3rd gear picking up speed and VERY tough time in 4th picking up speed. The engine sounds fine though. Do you guys think a bad turbo or a leak by the turbo side may cause the low oil pressure light when the oil is hot? Any input would be greatly appreciated. Thanks!!
sorry for the long post.

[AudiA4_20T]

Hey everyone, I'm new to this forum. Anyways I have a 2003 A4 which I purchased 2.5 years ago and it had 45k miles. After I purchased it I swap to synthetic oil and did my oil change every 5k with Mann filter from ecstuning. Recently my oil pressure light came out n flash whenever I drive on the highway for an extended period of time so I did a lot of research and concluded it might be sludge, I did the procedures here http://www.audizine.com/forum/showth...ghlight=sludge and after Step 1 I realized I had a leak somewhere on the left side of my car ( where the turbo sits) I havn't had time to jack up the car to look for the oil leak yet. But I finish up the flush with step 2 and diesel over night. I finished draining it after 12 hrs, did step 1 again n let the car idle for about 1.5 hr till the smoke show was over. Did a regular oil change and drove it this morning, had some misfires and smoke still but it was over pretty quickly. Car felt like normal again except one problem the oil pressure light came back on after 30 minute and also I think my turbo's dead I had a tough time in 3rd gear picking up speed and VERY tough time in 4th picking up speed. The engine sounds fine though. Do you guys think a bad turbo or a leak by the turbo side may cause the low oil pressure light when the oil is hot? Any input would be greatly appreciated. Thanks!!
sorry for the long post.

I would check your oil Pressure on VAG-COM, I would say that it could be your oil pressure sensor possibly, but I wouldnt rule that out until you have verified that the pressure is OK

[Jx3069]

I would check your oil Pressure on VAG-COM, I would say that it could be your oil pressure sensor possibly, but I wouldnt rule that out until you have verified that the pressure is OK

Sorry, forgot to mention, the pressure sensor's already been changed.