Technical Questions Answered

Honest John and other experts answer the technical questions about your car

Do you have to reset the ECU after cleaning the Mass Air Flow sensor?
How can I tell if the clutch in my car is failing?
I have a 1999 Jaguar S-Type. It has covered 34,000 miles and has a few problems, with faulty central locking and the rear windows stuck open. I don't think...
I go away for a couple of months around Christmas time and will be leaving my 2013 Volkswagen Golf on the driveway. Is it good practice to disconnect the...
We purchased (privately) a 2003 BMW 3-Series 1.8-litre petrol automatic in late 2016, with 49,000 recorded miles. It has a stamped BMW Service Record,...
I had the head gasket on my Peugeot Boxer changed, but on the way home (after about five miles) it decided to lose power and cut out. No lights came on...
I bought a 2004 Ford Fiesta, but the air con, radio, 12v socket and heater electrics don't work. Is there something that may be preventing them from working...
I hear a random whine coming from the rear of my 2006 Honda CR-V about once every journey. It lasts about 10 minutes and then goes away. When brakes are...
The heater in my Renault Scenic has stopping working. I've checked the fuse, but it's working fine. Any suggestions?
I was recommended to pressure wash under the bonnet of my 2003 Ford Focus prior to putting it up for sale. This was against my better judgement, but I...
My 2017 Vauxhall Astra has a large quantity of water sitting in the well under the boot floor where all the battery and fuses are located. It has stopped...
When I turn my on my right indicator, the right brake light also flickers. Once I put my foot on the brakes while indicating, the indication gets faster....
My Mazda CX-5 heating matrix has stopped working, which is quite chilly in winter. I've seen various messages that Mazda are aware of this issue, I was...
Driving down a country lane I hit a deep pothole that was covered by a puddle. I was probably going around 25-30mph. My front wheel on the passenger's...
My 2005 Ford (petrol engine) has started burning quite a lot of oil and I can't find an external oil leak. The car has done 100,000 miles and has been...
Yesterday I discovered water ingress in the front and back near side footwells of my Volkswagen Golf. Recently we have been having problems with condensation...
The heater in my 2002 Vauxhall Vectra has stopped working. Also the fan only works on the highest setting. What parts do I need and is it easy to fix it...
My Ford Mondeo's battery is discharging when it's shut down and stationery. It is a new battery, but the car is nine years old, with 53,000 miles on the...
On odd occasions my 2013 BMW X1 suffers the judders as I accelerate through the gears. As if it doesn't know whether to go on - but you can easily just...
The airbag warning light, along with an audible alarm, is constantly on in my 2007 Citroen C4 Picasso. How do I fix this?
My Peugeot Partner Tepee recently developed a knocking noise from underneath the vehicle when I go over bumps, rough road etc. I've had it looked at by...
Recently, I had the water pump changed in my 2005 SEAT Ibiza. It was always at 90 on my temp gauge, but since the pump change it keeps overheating. It's...
I saw your comments about the Volkswagen DSG gearbox in the Daily Telegraph. What is the problem with the DSG? I have had the Tiptronic in an Audi A4 quattro...
My Ford Transit Custom isn't blowing cold air. The temp gauge also shows no temperature.
I have a problem with the heater on my Triumph Spitfire. When the heater is turned to 'hot', it starts to produce nice warm air into the cabin once the...

Technical Questions: Engines

Is it possible to change this car from fuel injection to carburettors?
I have just bought a 9 month old third generation Honda Jazz SE. The manual recommends the use of 95RON super unleaded petrol. Will I damage the engine...
Is the engine on a Daewoo Kalos 1.2-litre 2003 8-valve after timing belt failure?

Technical Questions: Gearboxes

I want to change a normal gearbox into an automatic gearbox for a Wolseley 16/60 built in 1968. Is it easy to convert this and what will it cost?
Are there any reliable DSG transmissions used in Volkswagens? If so, which makes and models use them?
Do you have a list of good auto gearboxes?

Technical Questions: DPFs

I would be interested in your opinion about DPF problems and whether some mechanics and main dealers make a big deal out of problems that are otherwise...
I have a 2012 Mondeo 1.6 TDCi. I was in a traffic jam and the stop start was not working - the disable light was on and it would not turn off. I assumed...
What sort of speed and for how long do I need to be driving for the DPF on my diesel to be working?

Technical Questions: DMFs

I bought a used Volkswagen Tiguan in December 2017 and have covered 12,000 miles since. I recently took it for a service and the engineer told me that...
I had my clutch and DMF changed at Mr Clutch after the original one failed after 100,000 miles. The replacement lasted less than 10,000 miles, so Mr Clutch...
Our two year old Ford Transit Connect has just had to have a new dual mass fly wheel in it. Ford refused to change it under warranty because they said...

Technical Questions: Suspension

I have an Audi Cabriolet 1999 2.6 final edition that has a knock from the left side when turning to the right. My mechanic has checked the ball joints,...
The ride of my new Citroen Berlingo van is so hard. It doesn't absorb any bumps, it just thuds every time I go over any type slightly damaged road surface....
The front suspension on my 2014 Toyota Auris passenger side is shot. The driver's side is fine, but I obviously have to replace both. Are speed bumps causing...

Technical Questions: Bodywork

I see that an old Citroen HY Van body has been made from fibreglass. I am not talking about the latest body skin panels put onto a new model. Do you know...
My 1968 MG 1100 has cracked underneath and come away from the body. Can it be repaired? It is made of what looks like a hard cardboard. Could I buy a replacement?...
I bought a six month old Porsche 911 (991) model Carrera from a Porsche main dealer in September 2015. Mechanically the car is perfect, but there is an...
 

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