technical issues | Ask Honest John

My Mercedes-Benz SLK has had various faults recently - should I extend the warranty?

I have a four year old Mercedes-Benz SLK with 19,700 miles on the clock. I've owned it for a year and it has been covered by a warranty, which has now just expired. So far, it has had a new RPM sensor,...

Are the known tyre sensor faults on my Renault Clio grounds for it to be replaced?

I have a 2015 Renault Clio with approx 18 months warranty remaining. I've had persistent trouble with the tyre sensors malfunctioning and have had three new tyres already. The dealer says it's a fault...

Why is my car having issues since I used Redex petrol cleaner?

When I first start my 2001 Ford Mondeo in the morning it is great, however when the engine warms up I start having problems. It doesn't matter what gear I'm in, whilst trying to accelerate it jumps forward....

Does a creamy substance on the oil cap indicate head gasket problems?

Any ideas on how water is getting into the boot of a fairly new Citroen C1?

What could be causing the starting problems in my 2003 Renault Clio?

I have a 2003 diesel Renault Clio 1.9. The engine turns over, but there is no ignition. There is a strange whirring noise coming from the engine bay. So far I've discovered that it isn't the battery, there...

Why are all of my dashboard lights flashing while I drive?

My Ford Focus Mk1 dashboard lights keep flashing like a Christmas tree while I'm driving.

The speedo in my car doesn't match the speed I'm actually driving at?

When driving, the speedometer in my Citroen C3 Picasso is showing a different speed to that which I'm actually driving it. How do I fix it?

What does the engine warning light on my Volvo V60 mean?

How do you depressurise fuel, prior to replacing injectors, on a Peugeot 406?