Parts for your 2008 Toyota Prius-Camshaft sensor

2008 Toyota Prius Camshaft Position Sensor

Yes, the 2008 Toyota Prius (NHW20, 1NZ‑FXE) is fitted with a camshaft position sensor. Technical references that confirm this include Toyota’s Repair Manual for 2004–2009 Prius (TIS), which lists DTCs P0340/P0341 for the camshaft position sensor circuit, the Toyota Electrical Wiring Diagram for the 2008 Prius showing the G2 (camshaft) and NE (crankshaft) inputs to the ECM/ECU, and the Toyota Electronic Parts Catalogue which lists a genuine camshaft timing/position sensor for the 1NZ‑FXE cylinder head.

On this hybrid, the camshaft sensor’s main job is to tell the ECU exactly where the intake cam sits so it can fire the injectors sequentially, control VVT‑i accurately, and phase the spark correctly. Because the Prius stops and starts the petrol engine often, the ECU needs instant phase information to relight smoothly and keep fuel economy tidy. The sensor is a Hall‑effect design that reads a toothed target on the cam, translating rotation into a clean digital signal the ECU can trust even at very low cranking speeds.

There’s no scheduled replacement interval for the camshaft sensor, and it’s generally low‑maintenance. During routine servicing, it’s worth checking the connector for corrosion or damaged locking tabs, and having a quick look for oil weeping around the sensor’s O‑ring. Typical warning signs of trouble include a long crank/no start when the hybrid system tries to fire the engine, rough running once the engine is on, poor fuel consumption, or the MIL/Check Engine Light with codes like P0340 or P0341.

• Replacement tips:
  1. Make the vehicle safe: power down, then disconnect the 12‑volt negative terminal. Do not touch any orange‑sheathed high‑voltage cables under the bonnet.
  2. Remove the engine cover. The camshaft sensor sits at the timing‑chain end of the cylinder head on the intake side.
  3. Unplug the connector, remove the hold‑down bolt, and gently twist the sensor to free the O‑ring before pulling it out.
  4. Lightly oil the new O‑ring, seat the sensor, and tighten the bolt to spec (refer to the Toyota Repair Manual). Reconnect the plug and the 12‑volt battery.
  5. Clear any stored DTCs and confirm a clean restart and stable idle. A short road test over a few kilometres helps verify VVT‑i operation.
• Use quality parts, cheap copies can cause intermittent faults that are painful to chase on hybrids.

Popular questions

Where is the camshaft sensor on a 2008 Prius?
It’s mounted on the intake side of the cylinder head at the timing‑chain end, just under the engine cover. Look for a small, single‑bolt sensor with a 2‑pin or 3‑pin plug. Access is straightforward with basic hand tools.

What symptoms show a failing camshaft sensor on a Prius?
Common signs are hard starting or no start when the hybrid system tries to spin the engine, rough running once it’s on, reduced fuel economy, and the MIL with P0340/P0341. Sometimes it’s just a poor connector or oil contamination on the sensor tip.

Can it be driven with a bad camshaft sensor?
The car may still run, but it can stall, start poorly, or default VVT‑i control, which isn’t ideal. It’s best to diagnose promptly and avoid long trips until the fault is fixed.