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larryr123 · 11th February 2021, 07:33

Hi David, It's a good point, it definitely won't harm to clean/replace the EGR valve and I think I'll do this anyhow.
The car failed the MOT on the previous two showings due to emissions, which could point to an EGR problem, however there isn't a fault code being shown for this.
I guess a faulty or clogged EGR valve might show a P0400 code, but this has never appeared during the two times it failed. To get it through the test I applied a bottle of Clean Drive on a 1/3rd tank of fuel and in each occasion it made a massive difference with a transition from a widely failing emissions test to an very easily passing one.

Regards Larry

11th February 2021, 07:33	#10
larryr123 Avid contributor MG ZT-T Join Date: Aug 2016 Location: larryr123 - Biddenham, Bedfordshire Posts: 224 Thanks: 27 Thanked 19 Times in 17 Posts	Hi David, It's a good point, it definitely won't harm to clean/replace the EGR valve and I think I'll do this anyhow. The car failed the MOT on the previous two showings due to emissions, which could point to an EGR problem, however there isn't a fault code being shown for this. I guess a faulty or clogged EGR valve might show a P0400 code, but this has never appeared during the two times it failed. To get it through the test I applied a bottle of Clean Drive on a 1/3rd tank of fuel and in each occasion it made a massive difference with a transition from a widely failing emissions test to an very easily passing one. Regards Larry