Volkswagen Workshop Manuals > Polo Mk3 > Power unit > 4CV fuel injection and ignition system > Ignition system, glow plug system > Servicing ignition system > Checking knock sensor
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Volkswagen Workshop Manuals > Polo Mk3 > Power unit > 3-cylinder diesel engine > Fuel preparation system Diesel injection > Checking components and functions > Checking unit injector valves > Checking wiring to control unit