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Fault code P27F500 or P27F5 on your Golf 8, Leon, Octavia or A3? Solenoid 1 of the selector lever lock is stuck open. What it means, the causes, whether you can drive on and how it is fixed.

Does your BMW X5 45e jerk, bind or whine at low speed? Learn the causes of transfer case problems, what BMW’s own bulletin says, the electric-only test and when a rebuild beats a new unit.

Stiff clutch pedal or one that drops to the floor? Learn the signs of a worn or snapped clutch cable, how to tell it from a worn clutch and what decides the cost of replacement.

Selector lever fault, you can continue driving? What the message means on VW, Audi, Škoda, SEAT and Cupra, when you should stop driving, what to do right now and when to have the car towed.

The M32 gearbox is known for worn end-casing bearings. Learn to recognise the noise, why driving on gets expensive and what a proper rebuild with uprated bearings and the later end casing involves.

DTC 174311, 174401, 189412 or DF433 on your Renault EDC? A side-by-side table of DTC numbers and DF codes, what each one means per part, and why the gearbox computer (TCU) is usually the cause.

What gearbox is in my car? Find the gearbox code via the plate, the VIN or a read-out, with an overview of the ZF 8HP, ZF 5HP19, Aisin TF-80SC and Mercedes 722 automatics.

A checklist for gearbox failure: for each symptom the likely cause, whether you can keep driving and what to do, for manual, automatic, DSG and CVT gearboxes.

What is a car differential, how does it work and which types are there? Learn to recognise a failing differential by its noise and find out what a differential rebuild involves.