Parts for your 2010 Mitsubishi Lancer-Camshaft sensor

2010 Mitsubishi Lancer camshaft sensor — what it does and how to look after it

Based on Mitsubishi Motors’ workshop documentation for the Lancer (CY/CZ series, 2007–2015) covering the 4B11/4B12 and 4B11T engines, and parts listings used by Mitsubishi dealers, the 2010 Mitsubishi Lancer is fitted with camshaft position sensor(s). These engines use MIVEC variable valve timing and sequential fuel injection, both of which rely on camshaft phase feedback. Technical sections in the factory manual (Engine Electrical/Engine Control, Camshaft Position Sensor, and MIVEC System) outline diagnostics and procedures for these sensors, confirming their presence across 2.0L, 2.4L and turbo variants, with comparable coverage for the 1.5L 4A9 where fitted in some markets.

The camshaft sensor (often there are two: one for intake, one for exhaust) tells the engine computer exactly where each cam is in its rotation. That info lets the ECU time injection and spark precisely and command the MIVEC cam phasers to shift at the right moment. When it’s healthy, starts are crisp, idle is smooth and fuel economy stays on point. When it’s not, expect hard starting, longer cranks, a bit of a stumble off the line and the odd engine light with codes like P0340–P0344 or P0365–P0369.

There’s no fixed replacement interval in the Mitsubishi service schedule, they’re generally “fit and forget”. That said, a quick check each service goes a long way:

• Inspect the sensor connectors at the back of the cylinder head for oil intrusion, brittle wiring or damaged clips.
• Keep engine oil clean and the right grade, dirty oil can upset MIVEC operation and mimic sensor faults.
• If chasing cam/crank correlation faults, rule out timing chain stretch and cam phaser issues before blaming the sensor.

Replacement is straightforward with basic tools:

1. Disconnect the battery.
2. Locate the sensor(s) on the rear of the head, release the electrical connector.
3. Remove the retaining bolt, withdraw the sensor, and swap the O-ring (lightly oil the new seal).
4. Refit, tighten to the workshop manual spec, reconnect and clear codes. A short drive allows the ECU to relearn.

Go for an OEM or reputable OE-equivalent sensor, cheapies can introduce intermittent faults. If one sensor has failed on a high‑kilometre Lancer that uses two, it’s reasonable to test the other as well, but only replace what diagnosis confirms.

Popular questions

Where is the camshaft sensor on a 2010 Lancer?
On most 4B11/4B12 engines it’s at the back of the cylinder head. Many cars have two—one on the intake side and one on the exhaust side—mounted with a single bolt and a plug-on connector.

What are the signs the camshaft sensor is failing?
Hard starting, rough idle, flat spots, poor fuel economy and an engine light are common. Scan tools often show codes P0340–P0344 or P0365–P0369, and live data may show cam angle not tracking commanded MIVEC.

Can the car be driven with a bad camshaft sensor?
It may run in a fallback mode with reduced power and won’t be happy starting from cold. It’s best to fix promptly to avoid drivability issues and to prevent misdiagnosing more expensive parts like cam phasers.