Ask Honest John

Most recently answered ecu questions
Is it worth the cost of a remapping of the cars ECU on my BMW X1 2.0d?
I've just purchased a 72-plate Kia Picanto GT Line S. Do modern cars still have automatic chokes? My immediate area has 30mph camera controlled restrictions and I can poodle along in 5th but on the level...
Is it unusual to have to wait over six weeks for a replacement ECU ordered via a main dealer? They don't seem to be able to give me a delivery date so I don't know if this is a common issue with electrical...
I bought a Mercedes Citan 109 CDI long wheelbase panel van, registered 2018, in Feb 2019. It had approximately 8,000 miles on the clock. It now has approx. 13,000 miles on the clock. Recently the van...
The 2008 Mercedes A150 I was about to buy from a garage has had to have the ECU sent off for reconditioning in order to pass the MoT. The garage agreed to do this before I bought it. In light of this do...
Do you have any advice as to why my Citroen Xsara 1.4 petrol won’t rev properly? I’ve changed the throttle body and added fuel treatment. It runs and drives but it just won’t give a full rev as if it’s...
Do you have to reset the ECU after cleaning the Mass Air Flow sensor?
Is my Polo GTI clever enough to recognise that most of my driving is around town and remap its engine management accordingly? If so, how can I get out of this mode when I want to return to using maximum...
My mate's Rover 75 won't start. It keeps making a clicking sound when he turns the key and his battery has gone completely flat. It wont start and you can't bump start it because it's an automatic. Do...
My 981 Porsche Boxster was stolen and recovered the same day (15 August 2017). I'm still waiting to get it back from the insurance company. The ECU was cut out and the car was generally thrashed. Talking...