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Thread: 2009 A3 2.0 TDI 170 Fault code 00665 Boost pressure regulator range not reached

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  1. 2009 A3 2.0 TDI 170 Fault code 00665 Boost pressure regulator range not reached 
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    Flashing glow plug light comes on and car goes into limp mode. This seems to happen when travelling about 80 mph and at incline, when pressing accelerator. Although even without this problem occurring the car has lost all power it had. The fault code has come up on computer. Does any have ideas?? I'm concerned it is Turbo! Having looked around lots of possible items could be the issue, does anyone know if this car would have a diverter valve with a diaphragm, if so could this be split? Any help would be appreciated
     
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  2. Re: 2009 A3 2.0 TDI 170 Fault code 00665 Boost pressure regulator range not reached 
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    Hello ibaters
    I have the same car and I've had the same problem. It ended up being the diaphragm think it cost about £100
    Mine was split


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  3. Re: 2009 A3 2.0 TDI 170 Fault code 00665 Boost pressure regulator range not reached 
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    Many thanks, I'm assuming diaphragm is within diverter valve so whole thing needs replacing? Mine has only done 72K;-( Did you replace yourself, if so is it easy to access?
     
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  4. Re: 2009 A3 2.0 TDI 170 Fault code 00665 Boost pressure regulator range not reached 
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    Garage did mine , think it comes in kit form so don't think you have to replace full part , but not 100%sure


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  5. Re: 2009 A3 2.0 TDI 170 Fault code 00665 Boost pressure regulator range not reached 
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    Mine is a 59 170 sline with 67000 on it and the diaphragm went at about 60000 so you've not done bad at 72000


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  6. Re: 2009 A3 2.0 TDI 170 Fault code 00665 Boost pressure regulator range not reached 
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    Having same symptoms here, did changing the diverter valve cure it?
     
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  7. Re: 2009 A3 2.0 TDI 170 Fault code 00665 Boost pressure regulator range not reached 
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    Hi. New here. I am having the same fault. It's a 2007 a4 advant 2.0ltr tdi 170. Used to get p0299 underboost. Garage reconditioned turbo, cleaned egr throttle body intake manifold intercooler and dpf. ££££. Then I fitted retro fit cruise control. Car started have a wobble. Took it back to the garage sorted electric out and replaced N75 to sort the boost. It is still going into limp mode and code 00665 seatbelt warning-k19 006 sporadic short to positive. The battery is flat every morning. I'm at my wits (and wallets) end. Please help guys........
     
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