This little guy basically reads where the crankshaft is in its rotation. It’s a magnetic sensor, so it picks up on teeth or notches on the crankshaft or flywheel. It sends that information – the position and speed – as an electrical signal back to the engine control unit, or ECU. It tells the computer exactly which cylinder is ready to fire, and when. It's not just about position, it's about timing everything perfectly. Think of it as a key piece in starting and running your engine. When you turn the key, the ECU uses the signal from this sensor to figure out when to fire the spark plugs and inject fuel. While the engine is running, it constantly monitors the crankshaft position, sending updates multiple times per second. It works with other sensors, like the camshaft position sensor, to give the ECU a complete picture of what’s happening inside the engine. It helps manage things like ignition timing, fuel injection, and even variable valve timing if your car has that. Without a working phase sensor, your engine won’t run reliably, or might not run at all. You’ll likely notice if it’s going bad with a rough idle, stalling, a check engine light, and sometimes a loss of power. It acts like a shield protecting the engine from running at the wrong time which can cause serious damage. A faulty sensor can even prevent the engine from starting. Luckily, it’s a fairly common part to replace, and you can find them readily available. We carry a good selection at Fixparts Online, and it’s something a decent DIY mechanic can usually tackle. Better than the rest: Phase Sensor (MPN F01R00B003) is backed by a 12-month warranty!

About Bosch

With a heritage of innovation, Bosch provides dependable and efficient automotive components that set industry standards.

Why Choose Bosch?

• Bosch parts are known for lasting a long time, so you won't have to replace them often. • They're made with high-quality materials and tested thoroughly, meaning they perform reliably. • Bosch offers a wide range of parts, so you're likely to find what you need for almost any vehicle. • Mechanics and drivers around the world trust Bosch – it’s a name you can depend on. Bosch – trusted quality, available at FixParts Online!