Ask a Question

Ask Honest John

Most recently answered dpf removal questions
I bought a used Jaguar XF from a garage a year ago and it has just failed its first MoT since I've owned it. On investigation, it turns out that the Diesel Particulate Filter has been removed at some point...
I have a 2015 Volkswagen Transporter T5. The DPF warning light has come on four times since last December. I do a lot of short journeys, but try to do a long journey once a week. Three weeks ago I travelled...
What's the best way to clean soot from a DPF?
My Mazda 6 has a particulate filter warning light flashing, despite two hours on the motorway. The car has never done this in four years of ownership. It's done 99,000 miles. Does the DPF need cleaned...
I brought a brand new Mercedes-Benz GLA 220d last September. Within three months of ownership my engine management light came on and the cars power was restricted. The earliest Mercedes-Benz could book...
A friend's 2007 Audi A6 2.0 TDI had a DPF removed and deleted, as well as an EGR shut. It also had a remap done. From test drive, the vehicle begun emitting excesses smoke when the engine was heated and...
Can you clarify the situation regarding DPFs? What would happen if a used car was bought from a dealership and subsequently (after two years) found that the DPF had been removed? Could the dealership...
I had a DPF delete done in 2013 on my Ford Focus diesel. All was well until late 2014 when the powertrain light came on. I had the ECU checked, but no codes showed up. Since then I've had my local remapping...
I keep getting a DPF warning light on my 2008 Jaguar XF. Can I have it removed and have the ECU remapped? I've found lots of websites offing this service.
My beloved C30 does 600miles a week. 120 round trip commute. I had heard about cars not running because the filter blocks up, in the city as short journeys, low revs, the engine never cleans. I do travel...
 

Value my car