Hi Everyone. I am posting this on behalf of my brother who has an Octavia 1.6 TDI CR

 

The car appears to have had the emissions fix done back in 2018, and it would appear that now the car is suffering EGR sticking problems.

 

On previous cars I have had the EGR blanked and turned off, and it hasn't affected the DPF or regens, but will it cause a problem on his car?

 

There seems to be mixed information on this. Personally due to my experirnce with other marques I would say no but I would like to get a few more opinions before he gets it done.

 

Many thanks

When had mine done I was told that the EGR does have something to do with the DPF and I had to have both done.

Blanking it off will generate a fault code and force the engine into limited operating strategy.

 

You need to fit an EGR emulator/simulator which will also come with blanking plates but which are not needed unless there is a leak or the valve is stuck open.

 

plenty available on ebya for around £99

39 minutes ago, J.R. said:

Blanking it off will generate a fault code and force the engine into limited operating strategy.

 

You need to fit an EGR emulator/simulator which will also come with blanking plates but which are not needed unless there is a leak or the valve is stuck open.

 

plenty available on ebya for around £99

  Wish I had known that about the emulator/simulator I had mine done 6 years ago perhaps they was not around then. I had my EGR electronically closed only for it to open 5 years later the car was in a right state didn't know what it was, after spending pounds on air flow meters n75 valves having the turbo cleaned ending up having to take it to a specialist who found out what it was and physically blanked off the EGR at the throttle body.

The good thing about the emulator is there is no longer an electrical connection to the EGR so as long as its not stuck open it will remain closed and inoperational, if you end up with an undiagnosed problem like yours the emulator can easily be removed and the EGR connected to operate again, as long as no blanking plates were used.

Thanks for the help everyone. We were going to physically blank it and then get the EGR mapped out, but if an emulator is the way to go that would probably work out at a similar cost.

 

I know that during a regen the EGR is generally closed to increase combustion temperatures so that the regen is more effective.

 

I have experience with Alfa and BMW diesels but not so much VAG.

That would explain why my active regens are taking longer.

If the EGR is only deactivated and not blanked out it can over time accumulate soot and start to open and get stuck. Ideally you need to blank it at the same time.

How does this soot get to the valve if there's no gas flow because the valve is closed?

I think it must build on the underside of the valve (the exhaust side). I just know I've read posts etc from many people where they're suddenly having fault codes even though the valve is deactivated and it turns out the valve is partially stuck open which throws an engine light. So the sure fired way is to blank and deactivate.

I dont disagree with your comment about "the only sure fire way" but if the valve was closed then it will not open unless commanded and cannot stick open, if decativated using an emulator like my vehicle then the electrical connection to the EGR valve is removed so it is absolutely impossible for it to subsequently open.

 

Many may not have known that their valves were already stuck open, I checked mine using VCDS before disconnecting it, I have not fitted the blanking plate so that I can quickly reconnect it of required, for fault finding or if it became a problem for our CT (MOT) test.