Ask Honest John

Most recently answered electrical faults questions
I have a 2008 Mercedes-Benz ML 420CDI, which has had an intermittent satnav function for several months. After prolonged diagnostic testing at the local MB dealer they replaced the antenna at considerable...
I’m having a number of electrical problems with my 2001 Ford Focus. First the speedo sensor went - causing the car to have a slight drop in power and the speedo to stop working – then the heater packed...
We have a 2007 Peugeot 407 with 73,000 miles and just after the MoT about three weeks ago a light appeared on the instrument panel indicating the ASC was off. We have taken it to the local Peugeot dealer...
I bought a 2009 Mercedes-Benz E-Class CDI Blue Efficiency two days ago and the engine management light has come on. I took it back to the dealer and they replaced the sensors for free, but the light has...
The lights on my Ford Mondeo’s dashboard have gone out. The car's stereo system has also gone very quiet. I have checked the fuses and they are ok, I have also changed the speakers and stereo, but no joy....
My hazard lights aren't working. I want to check the fuse before calling the garage, but it's not clear from the manual which fuse it is though - can you help?
I have owned my 2004 Ford Mondeo since new and until last year it never gave me any issues for complaint. However, with 130,000 miles on the clock, it has started breaking down and I’ve spent £1500 over...
We’ve got an intermittent electric fault on our 2008 Vauxhall Corsa. The problem is sporadic, but results in the failure of the dashboard and lights. I’ve had a diagnostic test carried out, but it didn’t...
Having dropped a small coin into the cigarette lighter of my BMW 520d the local (non franchised) BMW dealer was unable to locate the offending fuse. The fuse diagram in the tool kit was not any help. However,...
You recently diagnosed an “antiskid service required" warning on a Volvo XC90 as being due to different sized tyres front to back, but there may be a different reason. When my 2006 Volvo S60 was about...