Parts for your 2015 Mitsubishi Lancer-Camshaft sensor

2015 Mitsubishi Lancer camshaft sensor — what it does and when to replace it

Yes, a camshaft sensor is fitted to the 2015 Mitsubishi Lancer. Factory technical sources including the Mitsubishi Motors Workshop Manual for CY/CZ Lancer (2007–2017), the Mitsubishi ASA electronic parts catalogue, and the engine management overview for 4B11/4B12 MIVEC engines confirm the use of camshaft position sensing. On these DOHC MIVEC engines, the ECU reads cam angle (intake and exhaust) together with the crank sensor to control variable valve timing and sequential fuel injection.

What does it actually do? The camshaft sensor lets the ECU know which stroke each cylinder is on. That signal is crucial for sharp cold starts, clean idle, smooth gear changes, good fuel economy, and emissions. It also allows the ECU to advance or retard the cams via MIVEC for stronger mid‑range torque without guzzling fuel. If the cam signal goes missing or drifts, the Lancer may crank longer, run rough, drop power, or default to safe timing. The check engine light will usually throw codes such as P0340 or P0341.

While the sensor itself isn’t a regular service item, a bit of preventative care goes a long way:

• Keep oil changes on time, dirty oil and sludge can affect cam control and foul the sensor.
• Inspect the connector and harness under the bonnet for heat or chafe damage.
• Watch for oil seepage at the rocker cover that can wick into the plug.

Replacement on the 2015 Lancer is straightforward for a competent DIYer. Most 2.0L (4B11) and 2.4L (4B12) cars have two cam sensors — one on the intake cam and one on the exhaust cam — mounted at the cylinder head. Disconnect the battery, unplug the sensor, remove the retaining bolt, and withdraw the sensor. Lightly oil the new O‑ring, seat the new unit, and tighten the bolt to the workshop manual spec. Use a quality OEM or reputable aftermarket part, then clear fault codes and take a short drive, no special relearn is typically needed as the ECU adapts on the fly. If codes return, check wiring, cam/crank correlation, and that MIVEC actuators are behaving. When in doubt, a scan tool and the factory manual are your best mates.

FAQs

Does a 2015 Lancer have one or two camshaft sensors?
Most 2.0L and 2.4L DOHC MIVEC engines use two — one for the intake cam and one for the exhaust cam. Check your engine code (4B11 or 4B12) and VIN data to confirm, as market trims can vary.

What fault codes point to a bad camshaft sensor on a 2015 Lancer?
Common ones are P0340 (camshaft position circuit) and P0341 (camshaft position range/performance). Similar symptoms can also come from wiring faults, timing issues on the chain, or MIVEC actuator problems, so test before you toss parts.

Do you need a relearn after replacing a camshaft sensor?
Generally no. Clear codes, start the car, and let it idle and warm up. The ECU will synchronise cam/crank signals automatically. If problems persist, check live data and perform MIVEC function tests with a scan tool.