Carautonomy — car parts and warning lights explained
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Drivetrain

What is a Differential?

Lets your driven wheels turn at different speeds in corners.

Power inDifferentialInner (slower)Outer (faster)Splits power so outer wheel spins faster when cornering

Simplified animation — not to scale.

In plain English

A clever set of gears in the axle (or gearbox on front-wheel-drive cars) that splits the power between the two driven wheels.

A simple analogy

"It is the wheels' negotiator — making sure each one turns at exactly the speed it needs to in a corner, instead of fighting each other."

How it works

In a straight line both wheels turn at the same speed. In a corner, the outer wheel has further to travel, so the diff lets it spin faster than the inner one without the tyres skipping.

Signs of trouble

  • ⚠Whining or howling noise that changes with speed
  • ⚠Clunk when pulling away or changing direction
  • ⚠Vibration on cornering
  • ⚠Oil leak from the axle
Rough UK cost

£400–£2,300

Parts: £200–£1,500
Labour: £200–£800

Always get a written quote. Prices vary by car, region, and parts brand.

Heads up: Carautonomy is for general guidance only. If your car is showing warning lights or behaving oddly, get it looked at by a qualified mechanic.

Keep exploring

Alternator
The on-board power station that keeps your battery topped up.
EGR Valve
A small valve that recycles exhaust gas to reduce emissions.
Starter Motor
The muscle that turns your engine over when you twist the key.

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A friendly note

Information here is general guidance, not a diagnosis. Always speak to a qualified mechanic before parting with cash.

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