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  1. P0401 egr insufficient flow 
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    Hi all.
    I have a P0401 egr insufficient flow error code come up.

    I have cleaned the existing egr and the light came back. Bought one from a breaker and light came back.

    I have been reading this thread from 2011 as well as others. Thought I'd create new thread rather than resurrect an old one.
    2.0 TDi EGR flow - Page 2

    According to the replies and solution it seems that it could be the egr solenoid.

    Where is this located on my car. I have a 2.0tdi Bluemotion B6 passat with cbdc engine code.
    Last edited by Nasif Khan; 11-05-2016 at 07:15 PM.
     
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  2. Re: P401 egr insufficient flow 
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    I got this pic from another thread, uploadfromtaptalk1452077091966.JPG

    Sent from my SM-A300FU using Tapatalk
     
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  3. Re: P401 egr insufficient flow 
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    I got that pic from eBay but that's is the egr solenoid for the vacum pipe

    Sent from my SM-A300FU using Tapatalk
     
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  4. Re: P401 egr insufficient flow 
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    Thanks. Where is it located?
     
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  5. Re: P401 egr insufficient flow 
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    There are a few valves and potentiometers in the EGR circuit on a Common Rail engine. The EGR system that regulates the re-burning of exhaust gases has High and Low pressure circuits depending on engine load etc.

    Read this as it will be relevant to your engine and may help you understand the EGR system in more detail. It is from VW America however who have lower diesel emissions limits than Europe but had nice software installed to meet them!!

    http://www.natef.org/NATEF/media/NAT...-0-TDI-SSP.pdf
    Mad Mitch
    VW Passat 2.0 Tdi Sport 170 BMR Engine, JPQ G/Box, DSG
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  6. Re: P401 egr insufficient flow 
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    Thanks for the replies.
    I'll definitely have a look at that.

    With the whole emissions thing...VW wrote to me saying my car is affected by the dodgy software.

    I have read somewhere that if it is a EGR cooler issue then there would be coolant loss. Is this correct? Because I don't get any coolant leak.

    Any suggestions?
     
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  7. Re: P401 egr insufficient flow 
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    For the dodgy software VW will just book you in and update to remove the hidden code. For the EGR problem the coolant loss is connected to another issue and not really to the gas flow. On odd occasions the EGR cooler will corrode on the inside allowing coolant to seep into the gas flow tubes. This causes problematic running and white smoke from the exhaust. Coolant levels drop without any visual leaks. If your coolant level is fine this will not be the problem affecting your car. Sometimes the aluminium EGR pipe from the back of the engine soots up and reduces gas flow but a serious restriction because of this is very rare. Often it is because the turbo seals on the exhaust side of the turbo have failed and oil vapourises into the EGR pipe along with sooty gas - not a nice mixture. It then gums up your main EGR valve and anti shudder flap at the intake manifold end as the already contaminated sooty gas mixes with more oily gas from the intercooler (which over time condenses oil from the crankcase vent pipe that shoves oil vapour into the pre turbo intake pipe - what a great system!).
    Mad Mitch
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  8. Re: P401 egr insufficient flow 
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    Thanks mad mitch for the reply.
    Not sure if this helps....I did have a turbo underboost issue. Got the actuator repair kit fitted and it back to normal. The EML was on during this whole time. Since having the actuator repair the EML light comes on for around 100 miles and also goes off after about 100 miles.
     
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  9. Re: P401 egr insufficient flow 
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    EML light? Engine shaped one is Emissions Warning and the yellow curl is the engine fault warning light (and in normal circumstances ALSO the Glow Plug preheat light).

    If the engine shaped one keeps coming on there is an issue with the combustion and the gas flow pressure out through the exhaust / DPF which is measured by sensors.
    Mad Mitch
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  10. Re: P401 egr insufficient flow 
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    It's the engine one. For thr past 100 miles it's been off but could come on.
    When you say measured by sensors...do you think it could be a faulty sensor?

    The glow plug one would come on for the turbo underboost.

    Sorry I didn't make it clear.
     
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