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99.5 TDI Jetta

My engine light had come on and off for about a week with code P1550.

No acceleration at freeway speeds
Intermittently sluggish acceleration in the city
From stop, no boost for a few seconds and then it takes off, and then no boost at each upshift for a few seconds, and then it takes off again.

I did a bit of reading about the problem and thought it might be a turbo, N75 solenoid or vac line issue. I noticed my vacuum lines were all old and frayed-looking. So, I replaced all of them yesterday because that was the easiest place to start, reset the code, drove around town with a noticeable improvement and no CEL. I also ohm-ed out the N75 and it is within range (from what I read) at 17 ohms, and it is getting voltage with the key turned on.

I drove 300 miles today, the light came back on about 100 miles in with intermittent acceleration issues in the 50-60 mph range. It is also very sluggish up hill and won't hold cruise control up a hill.

I usually get right about 50 mpg. Over the last week I got 40, but today's trip was a little better at 45.

The new codes are P1161 and 1156 (IAT sensor) with 1550 reoccurring. Maybe a MAP issue? Where do I start? I am not too terribly experienced with this car. Any advice is greatly appreciated. Thanks.

Premium Member
9,738 Posts
Welcome to the forum. welcometomyturbodies

Sorry this an old thread but I was just checking on what micah68 had posted before, now he has an AC fault.

VAG Error Code: 17958
EOBD II Error Code: P1550

Fault Location:
Boost Pressure Control Valve (N75) - Control Difference

Possible Cause:
Irregular behaviour.
Reduced power output.
Limp mode.

Hoses/Pipes incorrectly connected, disconnected, blocked or leaking.
Charger Pressure Control defective.
Solenoid Valve for Boost Pressure Control (N75) defective.Turbocharger (TC) defective.

Possible Solutions:
Check Hoses/Pipes to/between Components.
Check Charge Pressure Control.
Check Solenoid Valve for Boost Pressure Control (N75).
Check Turbocharger (TC).

VAG Error Code: 17569
EOBD II Error Code: P1161

Fault Location:
Intake Air Temperature (IAT) Sensor (G42) - Open Circuit/Short to Positive

Possible Cause:
Wiring open circuit/short to positive.
Manifold Temp Sensor (G72) is defective.
Possible Solutions:
Check wiring and connections.
Replace Manifold Temp Sensor (G72).

VAG Error Code: 17564
EOBD II Error Code: P1156

Fault Location:
Manifold Absolute Pressure (MAP) Sensor (G71) - Open Circuit/Short to Earth

Possible Cause:
Wiring open circuit/short to earth.
Manifold absolute pressure (MAP) sensor (G71).

As taken from my http://www.myturbodiesel.com/forum/f9/free-eobd-ii-error-codes-software-2919/
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