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  1. limp mode problem 
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    Hi, have problem with my vw golf 2ltr tdi mk5 golf BKD engine.
    started going into limp mode while overtaking, have read codes on my hand held scanner and come up with,
    P0401- exhaust gas recirculation flow insufficient.
    P0234 - turbocharger overboost condition.
    can anyone help me sort this problem??
     
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  2. Re: limp mode problem 
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    It needs a full scan and more diagnostics, could be the turbo vnt sticking. Try Kennys vw & audi specialists in Inverness.
     
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  3. Re: limp mode problem 
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    Try changing the engine oil to a top grade oil. this did happen to me on an A6 2.7 with the overboost message, turned out I had the wrong grade oil in the engine. Always use Shell Helix professional or Castrol nowadays
     
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  4. Re: limp mode problem 
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    You could have a vacuum control system problem there caused by a split hose or valve leaking or a faulty EGR valve and a dirty turbo, P codes alone can't tell you the full story, the outputs and measured blocks for the components need to be checked. You could go and fit a new EGR valve and turbo only to find out it is a simply vacuum leak.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
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  5. Re: limp mode problem 
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    thanks for info Rob will check them out
     
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  6. Re: limp mode problem 
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    Hi Crasher, thanks for your comments.
    Have had the over boost code coming up since had car (8years), just turn ignition off then on again and goes no problem.
    Went to garage today and they think might be EGR Valve dirty or sticking, recommend new one??
    Where to look for split hose??
     
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  7. Re: limp mode problem 
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    I would wait for the fault to develop, slit hoses are cheapest option at the moment
    VW POLO 2002 1.2 12v , Audi A6 2006 2.0 TDi SE , Skoda Fabia 1.4 TDi

    All 3 cars in the current fleet
     
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  8. Re: limp mode problem 
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    removed EGR valve at weekend and cleaned it. was able to push piston up and down with no problem.
    Took car for a drive and once got over 60mph it went back into limp mode and same faults coming up.
    can anyone tell me which hoses to check for slits or cuts ??
     
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  9. Re: limp mode problem 
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    Did you check the EGR valve diaphragm to make sure it was not punctured? To check for a vacuum system leak, firstly apply a vacuum to the source feed pipe of the servo line and see if you can pull a constant stream of air. Alternativlly you can just suck on the small vacuum hose but this will not eliminate the servo and its lines as a source of any vacuum problem. Quite often we find the valve block unit is leaking internally.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

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  10. Re: limp mode problem 
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    update, fitted new EGR Valve and problem still exists. any advise on which vacuum pipes to check would be appreciated. many thanks
     
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