Parts for your 2005 Toyota Prius-Crank angle sensor

2005 Toyota Prius crank-angle sensor: what it is, why it matters, and how to look after it

Based on Toyota technical references—the Toyota Repair Manual and New Car Features (NCF) for the 2004–2009 Prius (NHW20)—the engine control module uses a crankshaft position (crank‑angle) signal “NE” and sets OBD‑II DTCs P0335/P0339 if that signal is faulty. That confirms the 2005 Toyota Prius is fitted with a crank‑angle sensor.

On the 2005 Prius, the crank‑angle sensor (often called the crankshaft position or CKP sensor) keeps the engine computer perfectly in sync with the crank’s rotation. Even though the hybrid system can spin the engine with MG1, the ECM still needs an accurate “NE” signal to know exact crank speed and position for fuel injection, ignition timing, and misfire detection. Without it, the petrol engine may refuse to fire, run roughly, or trigger the MIL.

Working together with the camshaft position sensor, the CKP lets the Prius line up spark and fuel on the right stroke. It’s mounted on the timing chain cover, reading a toothed wheel on the crank. Because hybrids start and stop the engine frequently, a crisp, noise‑free signal is essential for smooth transitions between EV and engine drive—especially noticeable around town.

There’s no periodic maintenance for the CKP itself, but it’s smart to check it during services. Look for oil contamination on the connector, damaged wiring near the timing cover, or grime on the sensor tip. If replacement is needed, use quality OEM‑spec parts. Under the bonnet, disconnect the 12‑volt negative terminal and keep the vehicle out of READY (key/fob away) so the engine can’t start unexpectedly. Access is typically from the right‑hand wheel arch/splash guard area. Unplug the connector, remove the retaining bolt, twist the sensor gently, and pull it straight out. Lightly oil the O‑ring on the new sensor, seat it carefully, and refit the bolt and connector. Clear codes and confirm a clean start and stable idle, the Prius doesn’t require a special relearn procedure—normal driving lets the ECM validate the signal.

• Common symptoms: no engine start while in READY, intermittent stalling, rough running after warm‑up, poor fuel economy, or MIL with P0335/P0339.
• Good habits: keep connectors clean and secured, repair oil leaks promptly, and avoid routing aftermarket wiring alongside the CKP harness to reduce electrical noise.

FAQs

Does a 2005 Toyota Prius actually have a crank‑angle sensor?
Yes. Toyota documentation for the NHW20 lists a crankshaft position (crank‑angle) sensor providing the “NE” signal to the ECM. Faults are logged as P0335 or P0339.

Where is the crank‑angle sensor on a 2005 Prius?
It’s mounted in the timing chain cover, reading a toothed wheel on the crank. Practical access is usually from the right‑hand wheel arch after removing the splash shield.

Will it need programming after replacement?
No special programming is required. After fitting a quality sensor, clear codes and drive, the ECM will validate the signal during normal operation.