Reference: PTZ500330
Brand: Volkswagen
The camshaft position sensor works together with the crankshaft sensor to tell the engine control unit (ECU) exactly when the valves open and close. This information allows the ECU to synchronise injector firing and ignition timing accurately, which is essential for clean starting, smooth idle and efficient combustion.
When a camshaft sensor begins to fail or produce inconsistent signals, the ECU may struggle to synchronise fuel delivery correctly. This can lead to extended cranking, rough starts, misfires, unstable idle and reduced performance. Because these symptoms often overlap with airflow and ignition issues, camshaft sensor faults are frequently overlooked.
To understand how camshaft and crankshaft signals work together with airflow and throttle data during startup, read our in-depth technical guide:
Why Modern Vehicles Fail to Start or Idle Unpredictably – How Sensors Decide Whether Your Engine Lives or Dies
If your vehicle cranks for an extended time, runs roughly on startup or shows camshaft-related fault codes, replacing a failing camshaft position sensor can restore proper engine timing.
• Always confirm the correct sensor location, as many engines use multiple camshaft sensors.
• Oil contamination from leaking seals is a common cause of camshaft sensor failure.
• Inspect wiring and connectors carefully, especially near hot exhaust components.
• Clear fault codes and verify synchronisation using live diagnostic data after installation.
• Do not confuse camshaft sensor faults with timing chain or belt issues without proper diagnosis.
Poor servicing and oil leaks can accelerate camshaft sensor failure. Learn how delayed maintenance causes hidden engine damage in our servicing guide:
Most South African Drivers Are Servicing Too Late – Here’s the Hidden Engine Damage They Can’t See Yet
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Reference: PTZ500330
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