Parts for your 2008 Toyota Prius-Crank angle sensor

2008 Toyota Prius crank-angle sensor

Yes, the 2008 Toyota Prius is fitted with a crank-angle sensor (commonly called the crankshaft position sensor, CKP). This is documented in Toyota’s factory Repair Manual and Electrical Wiring Diagram for the 2004–2009 Prius (NHW20), where the ECM receives the “NE” crank signal and the “G2” cam signal for engine control. The Toyota TIS DTC list also includes P0335/P0339 for the CKP circuit on this model, further confirming its presence.

On the 1NZ-FXE engine, the crank-angle sensor monitors the exact position and rotational speed of the crankshaft. The ECM uses this data to fire the spark at the right moment, time fuel injection, detect misfires, and—critically for hybrids—sync the engine’s start/stop with the hybrid system’s motor-generators. Without a clean CKP signal, the Prius can crank but not start, cut out unexpectedly, or log fault codes that put it into a reduced-power “limp” state.

There’s no scheduled replacement interval for the CKP on a Prius, it’s a service-on-condition item. That said, it pays to keep an eye on the basics during regular servicing:

• Check for oil weeping at the timing cover area where the sensor mounts—oil contamination on the sensor tip can distort the signal.
• Inspect the connector and wiring for brittle insulation, bent pins, or green corrosion, especially if the car has done big kilometres or seen coastal conditions.
• Scan for stored DTCs (P0335, P0339) and look at live data if a rough start or stall is reported.

Replacement on the NHW20 is straightforward for a competent DIYer or workshop. The sensor sits low on the timing chain cover at the front of the engine, generally accessed from underneath after removing the undertray. With the car safe on stands, disconnect the 12 V negative terminal, unplug the sensor, remove the retaining bolt, and gently twist the sensor out. Fit a new O-ring, lightly oil it, seat the new sensor squarely, and tighten the bolt to the factory spec. Reconnect, clear codes, and confirm a steady crank signal in live data. No special relearn is typically required on this model once the fault is addressed.

Symptoms that point to a tired CKP on a 2008 Prius include:

• Long crank or no start when hot
• Random stalling at idle or when coasting
• Erratic tachometer behaviour and stored P0335/P0339 codes

Using a quality OE-equivalent sensor and a fresh O-ring, and keeping the connector clean and dry, usually means years of no-fuss running.

Does a 2008 Prius actually have a crank-angle sensor?

It does. Toyota’s factory Repair Manual and DTC list for NHW20 explicitly reference the CKP (“NE” signal) alongside the cam sensor (“G2”). If you’re seeing P0335 or P0339, the ECM isn’t happy with that crank signal.

What are common signs the Prius crank-angle sensor is failing?

Hot no-starts, sudden stalls, and a stored P0335/P0339 are the big ones. Sometimes it’ll start after cooling down, which points to a sensor that’s breaking down with heat. Checking wiring and oil contamination at the sensor nose is worth doing before replacement.

Is any programming needed after replacing the crank-angle sensor?

No special coding is typically needed on the NHW20. Fit the new sensor with a fresh O-ring, verify good connection, clear any codes, and confirm normal starting and smooth running. If faults persist, inspect the harness and the cam sensor, and verify timing chain condition.