Guides
Plain explanations of the jobs modern cars have made complicated: which EV charging adapter goes which way round, why a start-stop car cannot take an ordinary battery, why rear brake pads now need a scan tool, and how to tell a wheel bearing from a CV joint. No invented torque figures.
Every guide here is about parts we actually stock, and every one says where its own limits are — what decides the outcome, and which number has to come from the manufacturer's data for your specific vehicle.
EV and hybrid
5 guides
Charging connectors, high-voltage safety, hybrid cooling and the 48-volt systems that sit between a starter motor and a hybrid.
- Guide48-volt mild hybrids: what the belt starter generator doesIt replaced the alternator with a motor and made the accessory belt load-bearing in both directions. What a belt starter generator does, and how it fails.788 words
- GuideNACS, CCS1 and J1772: which EV adapter you actually needFour connectors, two currents, and adapters that only work one way round. Which EV charging adapter fits which car, and what no adapter can ever do.985 words
- GuideR1234yf and R134a: why an A/C service costs more than it used toDifferent refrigerant, different fittings, mildly flammable, and several times the price per pound. Plus the oil mistake that destroys an electric compressor.811 words
- GuideThe hybrid battery cooling fan, and the maintenance nobody doesMost hybrid packs are cooled by cabin air through a small intake behind the rear seat. It blocks with dust and hair, the pack runs hot, the bill is a pack.743 words
- GuideWorking around a high-voltage system: the orange cable ruleOrange means several hundred volts of DC, and DC does not let go. What the service disconnect does, why you still measure, and which tools are actually rated.760 words
Electrics and electronics
3 guides
Batteries that have to be coded, cameras that have to be aimed, and motors that fail differently from the mechanism they drive.
- GuideADAS calibration: when it is needed, and static versus dynamicA windshield, a bumper, an alignment or a mirror can put a camera or radar out of aim. No warning light is not proof: a degree of error is metres at range.901 words
- GuideWhy a start-stop car needs an AGM or EFB batteryA start-stop engine restarts dozens of times a journey. A conventional battery is not built for that, and on many cars the new one has to be registered too.914 words
- SymptomWindow will not go up: motor, regulator, switch or wiring?Silence points one way, a spinning motor points another, and glass that dropped into the door points a third. Plus the door-jamb wiring nobody checks.889 words
Steering and suspension
3 guides
Telling one noise from another, and the parts where fitting them wrong is invisible until the fault light.
- GuideAir suspension: repair it, or convert to coil springs?A leaking bag kills the compressor, so fixing the compressor first fixes nothing. What a conversion actually costs you, and when it is the right call.804 words
- SymptomHumming, clicking or grinding: bearing, CV joint or tyre?A hum that rises with speed, a click on full lock, a shudder under acceleration. Four common noises, and the free tests that tell them apart.867 words
- GuideThe ABS encoder in a wheel hub, and how to ruin one in a secondThe tone ring on a modern hub is a magnet moulded into the bearing seal. A magnetic tray or a socket is enough to corrupt it, with no visible damage.843 words
Brakes
2 guides
What changed when the parking brake became a motor, and what a rotor coating is actually protecting.
- GuideCoated brake rotors: what the coating is actually forIt is corrosion protection for the hat, vanes and edges, not a performance feature. Why it wears off the friction face on day one, and why that is correct.804 words
- GuideElectric parking brake: why rear pads now need a scan toolThe rear piston is driven by a motor and a screw. Wind it back the old way and you strip the actuator. What service mode does, and why it must be exited.820 words
Buying parts
2 guides
How to identify what you actually need, and how to tell a real part number from a listing title.
- GuideHow to read a part number, and why it beats a descriptionFour different numbers get called the part number and only two of them order anything. How to find the right one, and what a superseded number means.857 words
- GuideOEM, OE, aftermarket, remanufactured: what the tiers meanFour labels, used loosely by everyone. What each describes, which are the same part in a different box, and when a reman is the better buy.810 words
Engine and fuel
2 guides
Direct injection, forced induction, and the maintenance these engines need that the previous generation did not.
- GuideCarbon on direct-injection intake valves: why it happensPort injection washed the intake valves with fuel. Direct injection does not, so oil vapour bakes onto them instead. What actually removes it and what cannot.857 words
- GuideElectronic wastegate actuators, and why a new one needs calibratingThe rod length is set on the bench and the ECU learns the end stops. Swap the actuator without calibrating and you get boost codes on a healthy turbo.853 words
A question none of these answer? Ask us with the vehicle and a person will answer it.