On my 2012 1.6TDI , I have recently had the flashing glowplug warning light come on and this gives a fault code of P040300.  This has happened 3 times in the last couple of months and the last time it happen was nearly a month ago and happened twice on the same journey.

Each time on reading the fault it gave  P040300  Exhaust Gas Valve Recirculation Valve Circuit Intermittent.

Has anyone any thoughts on what might cause these faults?

It has been suggested that I can still read useful "live data" about the fault if the fault has not been cleared.  I have not cleared the fault so what useful live data might be available to indentify cause using an OBD reader?

I welcome any suggestions/comments.

Okay - assuming that the MK2 is on a Euro5 engine.  Has this been given the 'Diesel-gate modification' from Skoda or not?

 

EGR valves - they tend to get gummed up by their very-nature of gas-recirculation.  However, something that might help you here.

 

1) What is your typical journey like?  If its short, then you need to take the car on a VERY long/high RPM Italian tune-up to get all the crud out of the system

2) What fuel are you running on?  If Supermarket, when you next fill up, go and put in a tank of hi-addertive Diesel (super-diesel) and take for a good long/fast run

3) You can take out the EGR valve and clean it out.  Most local mechanics can do this or there are numerous threads about using various chemicals to clean out the EGR valve itself.

4) The Gas-recirculation valve might have gone open/circuit, but it will most likey be either stuck open or closed.

 

Have a further look at this link from Ross-tech to help you:

http://wiki.ross-tech.com/wiki/index.php/16787/P0403/001027

 

If you look elsewhere (in the VCDS section of the forum), if you find somebody close to you with a VCDS system, then maybe you can socially distance meet - and for them to read the codes from your car.

Edited 15 January, 20215 yr by varaderoguy

Hi,

Thanks for your reply.  Yes the car is Mk2 Euro5.  The EGR was replaced about 18 months ago so unfortunately outside the guarantee.  However the fault has only happened 3 times and otherwise the car runs fine.  Possibly some intermittent electrical fault?  The EGR is hidden at the back of the engine underneath the turbo.  So difficult to get at.

I have a code reader so I was wondering if I could still get useful data from the history live data, that might point towards the cause?