Check Engine warning light showing on dashboard

You've noticed that...

The dashboard warning light showing on this page (or one very similar, sometimes a slightly different shape or colour) has appeared on the dashboard and doesn't go off when the car is running.
These 26 parts can be connected to or cause the problem
Throttle Body
Exhaust Gas Recirculation Valve (EGR)
Exhaust Manifold Gasket
Thermostat
Blower Motor Relay
Fuel Pump Relay
In-tank Fuel Pump
Camshaft Position Sensor (CMP)
Mass Air Flow Sensor (MAF)
Speedometer Drive Sensor
Radiator Cooling Fan
Intercooler
Radiator
Crankshaft Position Sensor (CKP)
Knock Sensor
Idle Air Control Valve
Ignition Coil
Ignition Leads
Exhaust Manifold
Fuel Air Filter
Intake Manifold
Intake Manifold Gasket
Spark Plugs
Timing Belt
Timing Chain
Timing Chain Tensioner
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