diesel particulate filter | Ask Honest John

Ask Honest John

Most recently answered diesel particulate filter questions

I have owned a 2002 model Mazda 6 2.0 litre diesel for 96,000 miles. Never any trouble. I commute to work and use the car for business so almost every week I spend at least 2 hours on a motorway. So,...

Using the right oil to prolong DPF life

Please can you advise your readers to make sure the correct spec oil is being used in thier cars. I have a shiny 2012 Subaru Outback [Diesel]. Both the main dealer and the UK agents were unsure about...

Diesel cars - expensive problems due?

We have a 2005 Nissan X-Trail DCi Sport which has done 90,000 miles (we've had it since it was under a year old). After having a new turbo and intercooler under warranty after 2 years, it has been very...

Which three-year-old diesel auto?

We want to buy a 3-4 yr old diesel auto and have narrowed the choice down to a Ford Mondeo 2.0 TDCI Ghia or Skoda Octavia 2.0 TDI PD Elegance with 12-month manufacturer's warranty. In either case we...

Power loss at over 3000 revs in Vectra

My Vectra has been a great workhorse but now when accelerating hard the power fails at around 3000 revs. I have been advised it could be the air mass indicator that has failed. Could this be so?

Should I worry about DPF and DMF?

I have a June 2010 C Max, manual, 2.0L Duratorq-TDCi (136PS) - DW10, old model, with DMF and am pretty certain a DPF. The car has done 34k and I usually do around 16K per year including towing a caravan...

Optional DPF?

Is it true that the 1.6 HDi 90 engine on the Citroen C3 has an option for a DPF? If so would I be right in assuming you would recommend the one without one?

How long to keep my diesel i30?

I have a two-year old Hyundai i30 automatic which has behaved impeccably on a 70-mile daily commute (mainly motorway). Do I keep it for the term of the 5-year warranty or trade in before any potential...

Affect of diesel additives on DPF

I purchased my second hand Audi A3 Sportback 2.0 TDi 170 in December 2009. Have had no problems with the DPF until last week. DPF totally clogged - despite weekly long distance dual-carriageway driving....

When is a DPF fluid change due?

My Ford dealer tells me that I should have completely changed the DPF oil at the 37,500 service. My village garage - who did the service - says that AutoData (where they get their guidance on service requirements)...