alaska_tdi
New member
Looking for advice from the experts here. I recently purchased a 2005 Jetta TDI wagon, manual. I got lucky - It was a one owner vehicle with 92,000 original miles, completely stock, no accidents, and a full maintenance history performed on time. Timing belt was done at 90k. Love it!
I’ve owned the car for 3000 miles, and I’ve started having an issue where after the first 2-3 minutes of driving, there is a sudden reduction in available power that continues for the rest of the drive. It’s like a switch is flipped, and is especially noticeable at higher RPM’s. Normally the car will pull strong through 4000 RPM, but once the switch happens, there’s little power above 2500 RPM. It resets every time the car is turned off.
I have a long steady hill near my house that I used to confirm my suspicions. Once the engine was warm, I restarted my car to reset the problem, and then was easily able to accelerate to 50 MPH up the hill. A minute or two in, I suddenly lost power, slowed to 35 MPH (10 below the limit) on the same grade, with the pedal floored.
It seems like a sensor tripping something in the ECU. Based on information from these forums I suspected it might be a bad Mass Air Flow sensor. I brought the car to my local import mechanic and had them run the codes while changing the oil. They returned two engine codes.
16683 – Boost Pressure Regulation Control Range Not Reached P0299
18996- Turbocharger Boost Control Position Sensor Circuit Signal too Low P2564 – Intermittent
The mechanic’s note was “Possible bad valve position sensor on turbo causing boost codes, not building full amount of boost, turbo could be gunked up”
They said they could take apart the turbo and look for a possible cause of the problem. Before doing that (and committing to an expensive bill) I figured I’d check in with the experts here.
My questions are:
1) What is the most likely cause of the problem? I’m new to the forum, so feel free to link any info.
2) Is there a DIY repair? I’m not a mechanic, but am mechanically inclined.
3) What would the repair run in shop?
Thanks in advance!
I’ve owned the car for 3000 miles, and I’ve started having an issue where after the first 2-3 minutes of driving, there is a sudden reduction in available power that continues for the rest of the drive. It’s like a switch is flipped, and is especially noticeable at higher RPM’s. Normally the car will pull strong through 4000 RPM, but once the switch happens, there’s little power above 2500 RPM. It resets every time the car is turned off.
I have a long steady hill near my house that I used to confirm my suspicions. Once the engine was warm, I restarted my car to reset the problem, and then was easily able to accelerate to 50 MPH up the hill. A minute or two in, I suddenly lost power, slowed to 35 MPH (10 below the limit) on the same grade, with the pedal floored.
It seems like a sensor tripping something in the ECU. Based on information from these forums I suspected it might be a bad Mass Air Flow sensor. I brought the car to my local import mechanic and had them run the codes while changing the oil. They returned two engine codes.
16683 – Boost Pressure Regulation Control Range Not Reached P0299
18996- Turbocharger Boost Control Position Sensor Circuit Signal too Low P2564 – Intermittent
The mechanic’s note was “Possible bad valve position sensor on turbo causing boost codes, not building full amount of boost, turbo could be gunked up”
They said they could take apart the turbo and look for a possible cause of the problem. Before doing that (and committing to an expensive bill) I figured I’d check in with the experts here.
My questions are:
1) What is the most likely cause of the problem? I’m new to the forum, so feel free to link any info.
2) Is there a DIY repair? I’m not a mechanic, but am mechanically inclined.
3) What would the repair run in shop?
Thanks in advance!
