needle lift sensor

[4udi]

hi im getting error code 00550 issue with
needle lift sensor does this have anything to do with boost issues as my car struggles to go above 80 mph previous error was 0226 throttle sensor had it changed and the car runs smoother but still struggles with speed any suggestions as to what the problem could be thanks

[Col]

The needle lift sensor is part of the Nr.3 injector.

If it is faulty, the ECU will use a substituted value for that sensors input and as a safety feature not allow the engine to produce full power.

[ini]

The car is having problems regulating the 'start of injection'.

This is possibly due to a defective needle lift sensor (G80 / injector 3), but first make sure your static injection timing is within range, and that there is no air in the fuel lines.

[4udi]

thanks for the info lads getting the sensor tomorrow as mechanic wants it how would i check if the static injection timing is within range and if there is air in the system thanks

[ini]

The injection pump timing needs garage/dealer diagnostic equipment or vagcom connected to the car to check.

Depending on your model, there may be a transparent bit of tube in the fuel system that allows you to check for air bubbles.