Collection: Spark plugs

Spark plugs – choosing the right plug for a petrol engine

A spark plug generates the spark that ignites the air-fuel mixture in a petrol engine. This category includes selected plugs, including Bosch products for specific engines. Matching the exact part number matters more than vehicle make alone.

How to select a spark plug

Compare OE number, engine code, thread diameter and reach, spanner size, electrode design and the heat range specified by the vehicle manufacturer. Do not select plugs solely by appearance or electrode count.

Symptoms and installation advice

Hard starting, rough running and misfires may result from worn plugs, ignition coils or other faults. Use the specified tightening torque and avoid damaging cylinder-head threads.

See also ignition coils and verify the part number.