Parts for your 2006 Toyota Prius-Crank angle sensor

2006 Toyota Prius Crank Angle Sensor (Crankshaft Position Sensor)

The 2006 Toyota Prius (NHW20, 1NZ‑FXE engine) is fitted with a crank angle sensor, more commonly called the crankshaft position (CKP) sensor. Toyota’s Repair Manual for 2004–2009 Prius (Engine Control – “Crankshaft Position Sensor” and DTC P0335/P0339 sections) and the Toyota New Car Features (NCF) manual for the NHW20 both describe the CKP sensor’s NE signal, used with the camshaft (G) signal for engine synchronisation, fuel injection, ignition timing and hybrid start/stop control. Toyota parts catalogues for the 1NZ‑FXE also list a dedicated CKP sensor for this model.

On this Prius, the CKP sensor reads a toothed reluctor on the crank to tell the ECM exactly where the pistons are and how fast the engine is spinning. That’s vital for clean starts when MG1 spins the engine, smooth transitions between EV and petrol power, accurate VVT‑i operation, and reliable misfire monitoring. If the signal drops out, the engine may fail to start, stumble when the petrol engine cuts in, or trigger a check engine light.

It’s not a scheduled service item, but it’s smart to keep an eye on it during routine maintenance. Oil leaks, road grime, or a weeping timing cover can contaminate the sensor or connector. A quick visual check for damaged wiring, loose harness clips, or oil at the sensor is well worth doing when the under‑tray is off. If you’re chasing DTCs like P0335/P0339, rough starts, or sudden stalls as the engine kicks in, the CKP and its wiring loom deserve an early look.

Replacement is straightforward for a competent home mechanic, but hybrid safety matters. Disable READY, disconnect the 12‑volt negative terminal, and let the engine cool. The sensor lives low on the front of the engine block near the crank pulley/oil pump area and is held by a single small bolt. Unplug the connector, remove the bolt, and gently twist the sensor free. Fit a new O‑ring if supplied, lightly oil it, seat the sensor squarely, and tighten the bolt to the torque specified in the Toyota repair manual. Reconnect the harness, restore the 12‑volt, and verify no DTCs return. If in doubt, or if there’s any suspicion of harness damage, a pro auto‑sparky or Toyota‑experienced technician is a good shout.

• Common symptoms of CKP issues: check engine light (P0335/P0339), no‑start, harsh or delayed ICE engagement, intermittent stalling.
• Good practice: inspect connectors and grounds, check for oil contamination, and keep the lower engine area clean.

Is the crank angle sensor the same as the crankshaft position sensor on a 2006 Prius?

Yes. Toyota documentation and most workshops use “crankshaft position sensor (CKP).” It’s the same part people also call a crank angle sensor, providing the NE signal the ECM needs for timing and engine speed. On the NHW20 Prius, it works together with the camshaft sensor for cylinder identification and synchronisation.

Where is the CKP sensor located on the 2006 Prius?

It’s mounted low on the front of the 1NZ‑FXE engine block, near the crank pulley/oil pump area. Access is typically from underneath with the splash shield removed. You’ll see a small, single‑bolt sensor with a two‑pin connector routed along the engine loom.

Does the CKP sensor need regular servicing or periodic replacement?

There’s no scheduled replacement interval. It’s best treated as “inspect and replace if faulty.” During services, check for oil leaks onto the sensor, corrosion at the connector, and chafed wiring. Replace the sensor if there are fault codes (P0335/P0339), persistent start‑up issues, or confirmed signal dropouts on a scan tool or oscilloscope.