Question about 2003 Volkswagen Jetta TDI

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My VW is losing boost . The 1st turbo packed up so a backyard mechanic replaced it with another one . When it is cold you can feel the turbo starts boosting , but only up to 2500 rpm then it loses its boost . When the car heats up all the boost is gone .

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  • Volkswagen Master
  • 5,055 Answers

Ur bacyard mech may hav done things bacward--u need a haynes or some other repair manual/turbo book--scan car using tech II with a data stream for precise solution

Posted on Mar 20, 2011

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Posted on Jan 02, 2017

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2 Answers

Power loss at 3500rpm


check for loose hoses and splits in the intercooler

Feb 25, 2018 | 2009 Volkswagen Tiguan

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Polo Losing Turbo at random intervals


Friend, I can't help you with the computer problem, cause that's where the problem is arising from, but I will tell you it was not the turbo to begin with. The turbo operates from exhaust being forced thru it. Turbos are manual operational and have nothing to do with the computer. Except for the fact there are only sensors hooked to it for temp readings and the like. Good luck.

May 12, 2017 | Cars & Trucks

1 Answer

97 vw sharon tdi has full power to start with when driving but under load power drops of as if the turbo stoped working switch it of and on and it goes ok for a wee bit and does the same thing again


In your case the turbocharger is responsible for engine losing power.
The car goes in "limp home" mode!!!
After scan the EDC-15P engine control unit with a VAS, VAG or KTS -BOSCH diagnosis tool you will find this: Fault code: P1557-Turbo Boost pressure control exceeded
1. Engine stopped and ignition switch off. Check all pneumatic connections and hoses between turbocharger actuator = pressure unit for boost-pressure control, boost-pressure control solenoid valve, vacuum reservoir, EGR control solenoid valve, intake-manifold flap solenoid valve, EGR valve with throttle - part of intake manifold. Also the vacuum connection between tandem pump and brake booster. If you find something wrong replace parts. If not go to step 2.
2. Extract the hose of the turbocharger actuator = pressure unit for boost-pressure control part of turbocharger. Instead of the original hose you must place another 1 meter long hose with the same inside diameter, and then you check to inspire yourself the air from the other one extremity of this hose. The mechanical connecting rod of the turbocharger actuator must have a smooth and whole motion. If you can do that with your mouth, then you must replace the boost-pressure control solenoid valve. If you can not reach this with your mouth, then you go to step 3.
3. This is the most difficult work. The problem is that the soot particles deposits inside the turbocharger plugging the variable nozzle geometry mechanism = adjustable vanes of the turbine. If the turbocharger actuator is not able to adjust the turbine vanes the charge air pressure increase too much and ECU (engine control unit) go in "limp mode" = engine protection software. As a result the "limp home" mode engine still running until you turn the engine off (ignition switch off) and back on when the "limp mode" is deactivated, but the fault still remain in ECU memory!
4. You must be able to extract the turbo out from the engine. Then disassemble the turbocharger, clean inside adjustable vanes mechanism, and refit all in reverse order.


Good Luck!

Sep 22, 2011 | Volkswagen Passat Cars & Trucks

1 Answer

Hi, I have a 2006 5speed TDI Jetta, the car will start to **** and feel like its about to stall in 3rd or 4th gear. When the car comes to a complete stop, I notice that it eats up a lot more gas, moves...


In the most cases for VW TDI engines the turbocharger is responsible for engine losing power.
The car goes in "limp home" mode!!!
After scan the EDC-15P engine control unit with a VAG or KTS -BOSCH diagnosis tool you will find this: Fault code: P1557-Turbo Boost pressure control exceeded
1. Engine stopped and ignition switch off. Check all pneumatic connections and hoses between turbocharger actuator = pressure unit for boost-pressure control, boost-pressure control solenoid valve, vacuum reservoir, EGR control solenoid valve, intake-manifold flap solenoid valve, EGR valve with throttle - part of intake manifold. Also the vacuum connection between tandem pump and brake booster. If you find something wrong replace parts. If not go to step 2.
2. Extract the hose of the turbocharger actuator = pressure unit for boost-pressure control part of turbocharger. Instead of the original hose you must place another 1 meter long hose with the same inside diameter, and then you check to inspire yourself the air from the other one extremity of this hose. The mechanical connecting rod of the turbocharger actuator must have a smooth and whole motion. If you can do that with your mouth, then you must replace the boost-pressure control solenoid valve. If you can not reach this with your mouth, then you go to step 3.
3. This is the most difficult work. The problem is that the soot particles deposits inside the turbocharger plugging the variable nozzle geometry mechanism = adjustable vanes of the turbine. If the turbocharger actuator is not able to adjust the turbine vanes the charge air pressure increase too much and ECU (engine control unit) go in "limp mode" = engine protection software. As a result the "limp home" mode engine still running until you turn the engine off (ignition switch off) and back on when the "limp mode" is deactivated, but the fault still remain in ECU memory!
4. You must be able to extract the turbo from the engine and then to disassemble the turbocharger, clean inside adjustable vanes mechanism and refit all.

Dec 09, 2010 | Volkswagen New Jetta Cars & Trucks

2 Answers

I got a 1995 eagle talon.it has a coil pack.how


Does it have a turbo? Sounds like it does. Might need replacing.

Feb 04, 2010 | 1995 Eagle Talon

1 Answer

Vw tdi turbo dying


check the rubber pipes are not collapsing ,they run from the air filter to the turbo if they appear ok then replace the turbo

Jun 16, 2009 | 1999 Volkswagen Golf

2 Answers

At 2500 - 3000 revs in top gear my golf turbo loses power


Sounds like the car is going into limp mode, and then resuming normal operation the next time you start it. This is probably due to an overboost or under boost situation. If this is the case, the car's computer can't effectively control the boost the turbo is producing, so it just "turns" the boost off. Ask the shop what the engine code was specifically, and then compare it to VW specific codes. ( google "VW OBD codes"). I'm betting the code is either P1556 (boost control negative deviation, underboost), or P1557 (boost control positive deviation, overboost). Proper diagnosis with VW specific software is half the battle. The rest is methodical troubleshooting by you or your shop so you don't replace parts that don't fix the problem. No offense intended, but it sounds like you need to bring your car to a shop that knows VW's. Sorry I'm not more helpful, but without more info, I'm just taking a guess. I've actually had this problem with my Tdi, and the fix was cleaning the intake manifold and a slight turbo actuator adjustment. But, in your case, several things could cause this which is why proper troubleshooting is important. Hope this helps.

Oct 31, 2017 | 1998 Volkswagen Golf

1 Answer

Vehicle has loss of power when accelerating


The 100 series td is boost limited for 1st gear , this was a factory design to stop consumers getting overexcited at the traffic lights etc! If you think you are getting no power or boost in first (which would be odd) then connect a boost gauge to the turbo pressure vsv (vacum switching valve) on the intake manifold to see what sort of pressure you are getting.
All this can get a little bit involved ie type of motor 1hdt,1hd-fte etc etc, repost if you need further.

Mar 12, 2009 | 2004 Toyota Land Cruiser

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