Ask Honest John

Most recently answered diesel engines questions
I recently bought a 2002 Rover 75 diesel auto. After filling the car I noticed a ratting noise and the power steering stopped working. The alternator light has also come on. Can you help?
I am considering the purchase of an Audi A4 2.0TDI (143 PS) SE Avant (2011/60). I use my car mostly for short runs of 5-10 miles with a monthly blast up the motorway. Am I likely to have problems with...
I want to buy a new Audi, but can't decide between the diesel Q3 or A3. Which of these would you recommend as the best car in terms of running costs and low cabin noise?
I am becoming increasingly concerned about potential problems with my Ford Mondeo's DPF. My 2008 car is used on weekdays on a 12 mile commute. The route involves lots of traffic lights apart a short motorway...
My Volvo XC70 D5 (2010) Auto continually refuses to start. I have had a new fuel pump fitted, but the problem persists. The car is back with the dealer after being recovered yesterday. The engine turns...
I have seen a 2008 Ford Focus estate 1.6 TDCi with 104,000 miles on the clock for £3995. Would you recommend buying this caR?
I have a budget of about £12k and am torn between buying a used Seat Leon 1.6 TDI SE and the Hyundai i30 1.6CRDI. I would use it to travel about 20,000 miles a year so must have a diesel. What do you suggest?
I own a 2005 Vauxhall Zafira with a turbodiesel engine. However, the car has only covered 52,000 miles, yet it blows loads of smoke when it is idle. Any ideas what the fault could be?
Is it okay to change one piston? My Vauxhall Astra diesel has done 36,000 miles and there is no damage to the bore, only the piston and the head.
I need to replace my 2002 Ford Focus diesel estate. My distance to work is 14 miles so I need something frugal (diesel?) that will last five years. What would you recommend with a budget of £7000?