🔧 Parts Guide

Engine Parts
Complete Guide

Engine components keep your car running — from air and oil filtration to ignition and fuel delivery. Select any component below to learn what it does, what symptoms indicate failure and what it costs to replace.

The air filter prevents dust, dirt and debris from entering your engine.

The oil filter removes contaminants from engine oil, protecting moving components from wear.

The fuel filter removes contaminants from fuel before it reaches the injectors and engine.

Spark plugs ignite the air-fuel mixture in petrol engines — essential for combustion.

£20-£80 (full set)

Ignition Coilpacks

Coilpacks generate the high-voltage spark needed to fire each cylinder in a petrol engine.

£30-£100 per coil

The timing belt synchronises the crankshaft and camshaft — failure causes catastrophic engine damage.

£300-£700 including water pump and tensioners

The timing chain performs the same function as a timing belt but is made from metal and theoretically lasts longer.

Engine oil lubricates, cools and protects every moving component inside your engine.

£25-£80 for oil plus filter

Fuel injectors deliver a precisely metered spray of fuel into the engine for combustion.

£150-£400 per injector

MAF Sensor (Mass Airflow Sensor)

The MAF sensor measures the volume of air entering the engine, allowing the ECU to calculate the correct fuel quantity.

Lambda Sensor (Oxygen Sensor)

The lambda sensor monitors exhaust gases to help the ECU maintain the correct air-fuel mixture.

The turbocharger compresses intake air to increase engine power and efficiency.

£700-£1,800 supply and fit

The EGR valve recirculates exhaust gases back into the intake to reduce NOx emissions.

Diesel Particulate Filter (DPF)

The DPF captures soot particles from diesel exhaust gases and periodically burns them off.

£800-£2,000 replacement / £150-£400 cleaning

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