Glow plug fault code PO671 causing issues with reductant system and catalyst efficiency?

[Morgham]

I’ve got an Engine warning light on the dash, on inspection it’s given me PO671 - bank one glow plugs, but it’s also flagging up P204F and P20EE, these relate to the reductant system performance and catalyst efficiency of bank one.

Is it possible that the faulty glow plug is causing the emissions issues? Or should I settle in and await a large repair bill?

Van is still driving fine, no change to performance or mpg and no visible smoke.

 

[roadtripper]

If you search on the codes you'll find a number of threads, be aware it's P0 (zero) not PO (letter)

First guess is they are not connected except perhaps by age.

A thread on testing glow plugs here:

Carista code p0671 help!

Morning you handsome bunch! So I’ve been away just over 1k miles started the old girl up 2017 early plate t32 high line abs the engine light stayed on just yellow! Plugged in Carista and it’s came up saying cylinder one open. So my plan is to check the relay and fuses under the battery and go...

www.t6forum.com

And welcome!

Also this thread

Glow plug circuit open / fault code

Hi, Randomly getting the orange engine dash warning on my 2020 T6 204hp. I can clear it with Carista and the engine warning lamp disappears. Not getting any limp mode or anything. The fault code is suggesting open circuit / fault on cylinder 1 glow plug, but I am not experiencing any issues...

www.t6forum.com

 

[Morgham]

Thanks for that. I’d had a look through the past threads and was hoping that a dodgy glow plug might be causing the emissions issues. It looks like that might not be the case and I’m awaiting a big bill!