Help with limp mode problem


Registered User
Oct 2, 2012
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Cars in limp mode with the fault but the garage I'm using can't find the problem.
Anyone have any suggestions?
The code is 00665
Turbo has been off for inspection. It was clean and in good order
Dpf cleaned out. Still going in limp mode

Sorry to re post. Not sure what section was best to post this in

Hope someone can help :(

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take it you have checked all your pipes for leaks? Is your "dv" okay? N75 valve and n249 valve okay?
Are they using a generic fault code reader as using something like vcds will give a description of the fault too

Nothing comes up on ross tech wiki
this might be of some use

16683/P0299/000665 - Boost Pressure Regulation: Control Range Not Reached

Possible Symptoms
Reduced Power Output
Limp Mode

Possible Causes
Hoses/Pipes incorrect connected, disconnected or leaking
Charger Pressure Control defective
Turbocharger faulty
Diverter Valve faulty

Possible Solutions
Check Hoses/Pipes to/between Components
Check / Clean / Replace Charge Pressure Control
Check Turbocharger
Check Diverter Valve

Special Notes
When found in 2.0l TFSI: Check Boost Pressure Control Valve (N249), for cracked rubber diaphragm. A new/optimized Valve is available under Part # 06H-145-710-D (or newer). RoW vehicles see: TPI 2016331 for details.
NAR vehicles see: TSB 01-07-70 or 2013392 for details.
Cheers for that, ill pass the info on to see if anything has been overlooked

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