Parts for your 2012 Toyota Vitz|yaris-Camshaft sensor

2012 Toyota Vitz/Yaris Camshaft-Sensor: What it does and when to replace it

Yep, the 2012 Toyota Vitz/Yaris uses a camshaft-sensor. Toyota’s factory repair manuals for the XP130 series, the Electrical Wiring Diagram (EWD), and the Toyota Electronic Parts Catalogue describe a camshaft position sensor fitted to the engines used in this model year — notably the 1KR-FE (1.0L), 1NR-FE (1.3L Dual VVT-i), and 1NZ-FE (1.5L VVT-i). Dual VVT-i variants may run a sensor per cam, while single VVT-i engines typically have one on the intake side. OE supplier catalogues (e.g., Denso/Aisin) also list these sensors for 2012 Vitz/Yaris applications.

The camshaft-sensor feeds the ECU precise cam position data so it can sync injection and spark with the crankshaft, control variable valve timing, and keep cold starts crisp. When it’s healthy, timing is spot on, fuel use stays tidy, and the engine feels smooth across town and on the motorway.

When the camshaft-sensor starts playing up, the ECU loses that accurate phase reference. Common signs include hard starting or stalling after start, rough idle, flat spots under load, poor fuel economy, and the check engine light with codes like P0340/P0341. On some trims, the car may drop into a reduced-power mode to protect the engine.

It’s not a scheduled service item in Australia or New Zealand, but it’s smart to give it a quick once-over during servicing. Oil contamination from rocker cover leaks, damaged wiring looms, or brittle connectors are far more common than the sensor itself failing. Keeping engine oil fresh and to spec helps the VVT system behave, which also protects the sensor signals.

• If replacing: confirm the engine code (1KR-FE, 1NR-FE, or 1NZ-FE) and whether your car has one or two sensors.
• Disconnect the battery, release the connector tab carefully, and keep the area clean so debris doesn’t fall into the timing area.
• Install an OE or high-quality equivalent and torque to Toyota specifications from the service manual.
• Clear fault codes and road test, most ECUs relearn automatically within a few kilometres.

On the 2012 Vitz/Yaris the camshaft-sensor is usually mounted at the end of the cylinder head near the timing chain. Labour time is typically short, but diagnosis first is key — many “sensor faults” are actually wiring or oil leak issues. A quick scan, a visual inspection, and verifying live data will save guesswork and parts.

Popular questions

Where is the camshaft-sensor on a 2012 Vitz/Yaris?
It’s mounted on the cylinder head by the timing chain end. On single VVT-i engines you’ll usually find one sensor on the intake side, Dual VVT-i variants can have a sensor for both intake and exhaust cams. Access is straightforward once the engine cover is off.

A torch helps spot the small, two- or three-pin connector. If in doubt, check the Toyota EWD or the engine section of the factory manual for your exact engine code.

Can they keep driving with a dodgy camshaft-sensor?
If the sensor is flaky, the car might still run using fallback strategies, but starting, performance, and fuel economy can suffer. It may also trigger limp mode or stall at idle, which isn’t ideal for safety.

Best bet is to scan it, confirm the fault, and fix it promptly. Often the culprit is a leaking rocker cover dripping on the connector or a damaged loom rather than the sensor itself.

Does the 2012 Vitz/Yaris have one or two camshaft-sensors?
It depends on the engine. The 1KR-FE and 1NZ-FE commonly use a single sensor on the intake cam. The 1NR-FE with Dual VVT-i can use two — one for intake and one for exhaust — so the ECU can control both cams accurately.

Check your VIN and engine code, or compare with the Toyota parts catalogue to be sure before ordering.