diesel particulate filter | Ask Honest John

Ask Honest John

Most recently answered diesel particulate filter questions

I currently have a 2014 Mercedes-Benz C-Class diesel and I am waiting delivery of a new B-Class 180d. I prefer Mercedes diesels to Renault petrol engines. Because I only do around 8,000 miles per year...

Should I buy a petrol or diesel small van?

I want to buy a small van for our dog walking business. The Peugeot Partner/Berlingo/Cargo Life are absolutely ideal for our needs. It is lots of stop-start short journeys so we looked at the 1.2-litre...

Should diesel particulate filter (DPF) failures be covered by a manufacturer warranty?

Is the MG seven year warranty any good? The catalytic converter has failed (or the particulate filter) after only three years. Is that acceptable to be excluded from cover?

Why won't my Transit rev above 3000rpm?

I have a 2016 Ford Transit. The fuel filter light came on and a message said it’s blocked. It won't rev above 3000rpm. I changed the fuel filter this morning but it still won’t rev above 3000rpm?

All modern diesels have DPF problems if used for short journeys but are some makes worse that others?

Are engine revs raised during DPF regeneration?

Are engine revs raised during DPF regeneration on a Nissan Qashqai?

Do I need to get my DPF cleaned when I service my car?

I had a DPF clean, sensor change, timing belt and service done at 86,000 miles on my 2012 Mazda 6. It had returned to the garage with the DPF light on at 98000 and for a service. However, I was told the...

What sort of diesel regeneration does my car have?

I have a 2013 Mercedes E250. What sort of diesel regeneration does it have? I drive 50 miles or more on main roads at least weekly.

A colleague has removed the DPF on his car - is this illegal?

My work colleague has had problems with the DPF blocking up on his 2012 Mondeo. He has had the DPF removed and been told it is only illegal to remove the DPF on cars made in 2014 or later. Is this correct?

Why does the DPF light keep coming on in my car?

I have a Skoda Yeti 1.9 TDI I bought six months ago. In those six months the diesel particulate filter light has come on on three occasions - it is true that I don't do many miles and drive it like a diesel,...