Best OBD Scanner 2025: the best fault code readers tested
What's an OBD reader and why should you buy one? We've reviewed eight OBD scanners to see which offers the best balance of features versus price...
MartynnsTips Tips and Tutorials Archive
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Does diesel have a future?
The latest SMMT sales data for 2024 gives a stark reminder of diesel's demise, but Haynes expert Martynn Randall says it's still the right fuel for some people...
Are winter tyres worth it?
Should you buy winter tyres? Are they the same as ice tyres? Can you use winter rubber in summer? Martynn Randall reveals all.
Driving through water: is it safe to do so?
What's the best way to get through floodwater and make it to the other side? Martynn shares his stories and has some tips to help you get home with dry feet...
Can you drive a hybrid car with a flat battery?
At some point, all batteries will go flat, but it's more of a problem when that battery powers your car's hybrid system. Haynes' Martynn Randall investigates...
Are wet timing belts a bad idea?
The wet cambelt is a comparatively new technical direction, but is it the right one to go in? Haynes' Martynn Randall has doubts...
Will my car battery die in cold weather?
Winter will always test a car battery's mettle, what with low temperatures and the extra demand of heated seats and screens. Martynn advises on how to keep your battery in the best of health...
6 ways to spot a clocked car
The dangers of buying a clocked car are real – not only will you be out of pocket but you could also be in danger. Hayne's Martynn Randall helps you avoid being stung...
Auxiliary belt – checking and changing
Your car's auxiliary belt is vital, so it pays to make sure it's in good nick. Haynes' resident expert Martynn Randall advises on how to keep an eye on it, and how to swap it...
10 Highway Code rules you didn’t know about
The Highway Code has so many rules that there are bound to be a few unusual ones that you don't know about. Martynn Randall of Haynes lists 10 odd rules...