Parts for your 2011 Toyota Prius-Camshaft sensor

2011 Toyota Prius camshaft position sensor: what it is, where it is, and when to replace it

First things first: the 2011 Toyota Prius (ZVW30, 2ZR‑FXE engine) does use a camshaft position sensor. This isn’t a guess — it’s documented in Toyota’s service information. The Toyota Repair Manual (TIS) includes DTCs P0340 and P0341 specifically for the camshaft position sensor “A” on Bank 1, and the 2011 Prius Electrical Wiring Diagram labels the camshaft position sensor as “G2” on the cylinder head. Toyota’s parts catalogue for the 2ZR‑FXE also lists a dedicated camshaft position sensor and O‑ring. So yes, it’s fitted and it matters.

On this hybrid, the camshaft sensor helps the engine ECU know exactly where the intake cam is, so it can sync fuel injection and ignition, control VVT‑i on the intake side, and manage those frequent engine start/stop events smoothly. Without a clean cam signal, the Prius can struggle to start the petrol engine, run roughly under load, or default the valve timing and waste fuel.

It’s not a routine “service item” like oil or filters, but it does benefit from a quick look during scheduled servicing. Under the bonnet, check the sensor body on the timing chain end of the cylinder head for oil seepage, and make sure the connector and wiring loom aren’t brittle or chafed. Oil contamination or heat‑soaked wiring are the usual culprits when issues crop up after many kilometres.

Common clues it’s on the way out include a check engine light with P0340/P0341, rough running when the engine cuts in, hesitant starts, or poorer fuel economy. Because this is a hybrid, it may not “crank” like a conventional car, instead, it may attempt to start and then stop repeatedly. Don’t ignore it — running with incorrect cam timing feedback can make drivability ordinary and stress other components.

If replacement’s needed, it’s a straightforward job for a tech: disconnect the 12‑volt negative terminal, never touch the orange high‑voltage cables, unplug the sensor, remove the single retaining bolt, swap the sensor and O‑ring (lightly oil the O‑ring), refit, then clear codes and confirm live data with a scan tool. Use a quality OEM‑equivalent part, ultra‑cheap sensors can be false economy. If the fault returns, have the wiring and the crankshaft position sensor checked as well, as the ECU compares both signals.

• No set replacement interval — replace on fault, and renew the O‑ring if the sensor is removed.
• A quick loom and connector inspection at each service can save headaches later.
• Expect modest labour time, most workshops can organise this promptly.

Popular questions

Does a 2011 Prius actually have a camshaft sensor?
Yes. Toyota’s 2011 Prius 2ZR‑FXE engine uses a single camshaft position sensor on the intake cam. It’s referenced in the Toyota Repair Manual via DTCs P0340/P0341 and shown as “G2” in the Electrical Wiring Diagram. It’s mounted at the timing chain end of the cylinder head.

What are the signs of a failing camshaft sensor on a Prius?
Look for a check engine light, codes P0340/P0341, rough or delayed engine engagement when the hybrid system brings the engine online, and a drop in fuel economy. Because the Prius starts and stops the engine often, symptoms can feel intermittent at first.

Can it be driven with a faulty camshaft sensor?
It may still run, but it’s not ideal. The ECU can fall back to default timing, which hurts performance and economy, and the engine may stall during start/stop transitions. Best to get it diagnosed and sorted to avoid being stranded.