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Sunday, August 27, 2017

High idling speed accompanied by oil leaks, lack of power and fault codes on VAG 2.0 TFSI vehicles (post nr 17-006)


On some models from the VAG manufacturer with 2.0 TFSI (Turbocharged Fuel Stratified Injection) engine, with BWA, BPY and BYD engine management, it is likely that the following fault will be found:

Firstly, after repeated incidents, a list of recorded fault codes became evident in the engine control unit that could occur: 

P0507 – Idle control fault.
P2279 – Leak in the air intake system.

  • In this fault, constant oil leaks are identified at the rear of the engine and in the spark plug locations. It is possible that fuel may be found in the spark plug area due to a loosening of the cylinder head bolts as a result of excessive pressure in the lubrication circuit.
  • The valve intended to retain the crankcase vapours (PCV), that is joined to the cylinder head cover does not function correctly, specifically the internal membrane of the non-return valve. This PCV internal fault allows the turbo pressure to enter the oil vapour circuit.
  • The model of the crankcase oil vapour purge valve must be checked and the metal hose doser that runs from the turbocharger to the intake manifold. There are specific spares for these two parts to solve this fault.

A- Old model 
B- Modified model
Section affected of the hose that runs from the turbo to the intake manifold.

A- Old model
B- Modified model
C- Visual differences
View of the affected PCV modules.

 To correctly repair the fault, take the following steps:

1 - First, check for the existence of oil leaks at the rear of the engine as indicated at the beginning of this newsletter.
2 - Check the existence of fuel or oil from the engine's lubrication circuit in the spark plug area.
3 - Check the condition of the cylinder head bolts and retighten them to 10 Nm if necessary.
4 - Check the PCV model.
5 - Check the doser of the hose joined to the turbo and the intake manifold.
6 - Replace the affected turbo's metal hose and the PCV valve with the modified version with the appropriate part reference for each model:

Part references of the old model of the affected PCV:
·                     For all models: 06F129101E, 06F129101F, 06F129101K, 06F129101L, 06F129101N.
·                     The reference of the modified PCV model: 06F129101P.

Part references of the old model of the affected turbo hose:
·                      For all models: 06F103215A, 06F103213N, 06D103215A, 06D103213G.
·                      The part reference of the modified turbo hose model: 06F103215B or 06D103215A.

Note: The tightening of the new crankcase vapour recirculation valve (PCV) should be 4 Nm, and the coupling of the new hose to the turbo should be 9 Nm.

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