Parts for your 2021 Mitsubishi Eclipse cross-Camshaft sensor

2021 Mitsubishi Eclipse Cross Camshaft Sensor

Based on Mitsubishi Motors workshop literature for the Eclipse Cross (2018–2021, engines 4B40 1.5L turbo and 4B11 2.0L) and the Mitsubishi ASA/CAPS OEM parts catalogue, the 2021 Eclipse Cross is fitted with camshaft position sensor(s). Technical databases used by trade workshops also list CMP-related DTCs (e.g., P0340/P0341) for this model, which confirms the sensor is monitored and used by the ECU. So yes—this vehicle absolutely relies on a camshaft sensor for correct running.

The camshaft sensor lets the ECU know exactly where the cam(s) are in relation to the crank. On the Eclipse Cross, that data is used for precise fuel injection timing, spark timing, and to control MIVEC variable valve timing. Without a clean signal the ECU can’t sync properly, so owners may notice hard starting, a rough idle, poor fuel economy, or the Check Engine lamp. In some cases the car can drop into a limp mode to protect the engine.

As a servicing item, the camshaft sensor isn’t something that needs routine replacement. What does help is a quick visual once-over during regular services:

• Check the sensor connector and harness near the cylinder head for oil seepage, brittle insulation, or rubbing.
• Look for signs of contamination from leaked engine oil, fix the leak first to stop it coming back.
• If a fault code appears, rule out wiring and connector issues before condemning the sensor.

Replacement is straightforward for a competent home mechanic, but most owners will prefer a workshop. Typical approach is disconnect the battery, unplug the sensor on the head, remove the retaining bolt, and ease the sensor out, refit with a fresh O-ring lightly oiled, then clear codes and perform any required ECU relearn with a scan tool. On some variants there may be two cam sensors (intake and exhaust), ensure the correct side is replaced and don’t mix the plugs. Cheap pattern parts can be false economy—an OEM-quality sensor helps keep MIVEC happy and the idle smooth.

Common symptoms pointing to a failing cam sensor include:

• Hard starting or extended cranking
• Rough idle and flat spots on acceleration
• Check Engine light with P0340/P0341

Left too long, a dodgy signal can stress the catalytic converter and bump up fuel use, so it’s worth getting sorted promptly.

FAQs

Does the 2021 Eclipse Cross have one or two camshaft sensors?
Both engines used in this model year employ camshaft sensing. Depending on market/engine, there may be a single sensor or one each for intake and exhaust cams. A quick VIN-based parts check will show the exact setup.

If there are two, they’re typically mounted on the cylinder head near the cam sprockets, with distinct connectors to avoid mix-ups.

Is it safe to drive with a camshaft sensor fault?
It’ll often start and run, but the ECU may fall back to a less precise strategy, which can mean poor performance, higher fuel burn, or limp mode.

Short trips to a workshop are usually fine, but it’s best not to put off diagnosis—ignoring it can lead to catalyst damage over time.

After replacing the sensor, does anything need programming?
It’s good practice to clear fault codes and perform any available cam/crank relearn with a scan tool so the ECU syncs cleanly.

Many cars relearn on their own after a short drive cycle, but a proper scan-tool reset speeds things up and confirms the fix.