Ask Honest John

Most recently answered diesel engines questions
I own a 2017 Vauxhall Astra 1.6 CDTI SRI NAV. The engine light is on and going in limp mode. It shows codes: P2453, P2452, P244A, P226D. Can you tell me what is wrong with my car?
My 2015 Volkswagen Caddy 1.6-litre TDI is losing power. It starts fine and ticks over. Can you tell me what the problem may be?
I have a 2003 Honda CR-V petrol auto, which has covered 170,000 miles. For the past two years the engine management light has been lit an increasing amount, and for some months is permanently on whilst...
I bought a Mazda3 2.2 diesel 2010-plate through a finance company from a forecourt in September with a three-month limited parts and labour warranty. Last week the engine seized and the car will no longer...
I need to replace the EGR valve on my seven-year-old Volkswagen Tiguan diesel, at a cost of £1200 because it is coked-up. My car was subject to the emissions scandal and was modified by Volkswagen to comply...
Would changing the engine in my Citroen Relay to a 2.2-litre BlueHDi be possible and make it compliant with the London ULEZ?
How much would it cost to modify a 2012 Ford Transit Van to avoid ULEZ charge?
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,...
What sort of speed and for how long do I need to be driving for the DPF on my diesel to be working?
I read a lot about diesel DPFs but how do I know when the fuel system is regenerating? I drive a Toyota RAV4 2.2-litre diesel. Nothing comes alight on the dash board and only once did I smell hot oil?
 

Value my car