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Computer that controls the engine's functions, such as fuel injection and ignition timing

The electronic control unit (ECU) is part of Volkswagen’s Digifant fuel-injection and engine-management system. Gerry’s 1986–1991 technical bulletin index distinguishes these applications from the earlier Digijet years. In a January 1999 list thread, an owner of a 1986 Westfalia reported that the engine quit after cooling-system bleeding and asked whether fuel starvation or a failed Digifant component was involved; the thread records a troubleshooting question, not a confirmed diagnosis. Check engine code and market before identifying an ECU.

A measure of a battery's ability to supply power when the engine is not running

A measure of the density of a liquid, used to determine the state of charge in a battery

A mixture in which particles are suspended in a liquid, used to stabilize PTFE in engine oils

Device used to measure exhaust gas content, including carbon dioxide, carbon monoxide, oxygen, and hydrocarbons.

A type of manifold used in some engines, with two outlets

A system used to direct cooling air to a component, such as an alternator

Measure of the fuel pump's ability to deliver fuel to the engine

a system that adjusts the vehicle's suspension and steering for optimal performance

a device that reduces nitrogen oxide emissions by converting them into nitrogen and water

A device that advances the ignition timing in response to vacuum changes in the engine

A metal plate used to cover a hole in the dashboard if a radio is not installed.

Thermoswitch for pre-heating the inlet manifold in Waterboxer engines

A switch that interrupts the main electrical circuit in case of an overload or fault

A device that measures the fuel level in a vehicle's fuel tank

A type of grease recommended for lubricating clutch disc hubs

A device or mechanism that generates a vacuum, used for various purposes such as bleeding the cooling system.

A ring that fits around a piston to seal the gap between the piston and cylinder

Systems that control the temperature and air quality inside the vehicle