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2006 Audi A4 - I have an ECU code P0299 -002 lower limit exceeded

The car runs fine but check engine light comes on after driving for about 60 miles. Is the turbo cut off valve bad? or is it somethine else. Any suggestions.

Posted by f_fowler on

  • 2 more comments 
  • f_fowler Dec 22, 2008

    Not sure, turbo was change out at Audi dealer just before Thanksgiving. The car runs fine, maybe just a bad sensor or air leak somewhere. Just hate to take it back to the dealer.

  • f_fowler Dec 22, 2008

    The car runs ok after the light came on. If you extremely accelerate the car feels slightly sluggish. Otherwise the car runs fine, good gas mileage, no issues. The code was check by Volkswagon Tech and reset but came back on.

  • keith_little Feb 02, 2009

    i have ecu code PO299 tubo charger boost sensor A circuit control limit not reached, any ideas on the problem thanks

  • Marvin
    Marvin May 11, 2010

    what do u think is wrong?



1 Answer

Jerry Parmanand

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You have to pull the code to know what's wrong, do you have any drive ability problems?how different is the car driving after the light come on?

Posted on Dec 22, 2008

  • Jerry Parmanand Dec 22, 2008

    Why P0299 fault code is related to your turbocharger boost pressure that can cause low engine power. Shown also are OBD2 codes and their general meaning below.

    P0299 Engine Turbo-Supercharger Boost

    This code pertains to the turbo housing resonator which makes the turbo quiet. Normally, the part is broken into to 2 parts which are glued together. This is the source of the problem, the glue usually fails and this affects the turbo pressure which is usually needed in going uphill. The part can be bought from the dealer or check your after market supplier of this turbo model. On some European cars, this P0299 fault code can also mean that the waste gate solenoid actuator is defective. As such, it could cause turbo inactivity causing the engine to loose power. To check, test the wirings of the turbo waste gate solenoid and the vacuum supply to the actuator. If OK, the most common fix is to replace the waste gate solenoid.

    Turbo Boost Pressure:

    The way turbo boost pressure works, if the turbine housing has small apertures (passage ways), it will make the turbo work at lower engine speeds. However, it can cause restriction to the exhaust gasses flow at higher engine RPM. If the compressor assembly is too big in relation to the turbine, it could cause stalling, but if it is too small, it could cause turbo over-speeding and will self destruct. In this sort of set-up, the system is controlled by the engine management system. Boost is generated by increase of exhaust pressure that is NOT going into the engine. Usually, this boost pressure is detected by an air flow sensor when a signal is then sent to the ECU (engine computer) which regulates boost pressure.

    NOTE: In order to ensure that a high boost pressure is developed even at low engine speeds, the turbine and compressor sizes would have to be made smaller as much as possible.

    In order for the wastegate to work, the compressor reference port must be hooked up to the compressor side of the turbo because the vacuum line attachment limits the set spring pressure. This in essence, will build unlimited boost pressure until your engine is destroyed. For more detailed information about turbo boost pressure, please contact ATS. good luck buddy happy holiday.



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