Engine Camshaft Sensors - What Are They? How Do They Work?

What do they do?

Determine the exact position and speed of the camshaft(s).

How do they work?

ECM uses a digital or analog signal from the camshaft sensors to ensure proper timing of fuel injection and ignition, as well as VVT operation.

Where are they located?

In the cylinder head, valve cover or timing cover.

Symptoms of failure

• Check engine light
• No start
• Hard start/extended cranking time
• Failed emissions test
• Engine misfire

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