Parts for your 2021 Mitsubishi Eclipse cross-Crank angle sensor

2021 Mitsubishi Eclipse Cross crank angle sensor: what it does and when to service it

Based on Mitsubishi’s workshop literature and parts listings, the 2021 Eclipse Cross is fitted with a crankshaft position sensor (often called a crank angle sensor). Technical sources that document its presence include: Mitsubishi Eclipse Cross (GK/GL) Workshop Manual – Engine Electrical (MFI) section detailing the Crankshaft Position Sensor (CKP) and DTCs P0335–P0339, the Eclipse Cross Electrical Wiring Manual showing the CKP circuit to the ECM, and Mitsubishi’s ASA electronic parts catalogue listing a CKP for the 4B40 1.5L turbo petrol engine used in 2021 models.

On the 2021 Eclipse Cross, the crank angle sensor tracks the exact position and speed of the crankshaft so the engine computer can fire the spark plugs and inject fuel at the right time. It also works with the cam sensor to confirm engine phase for smooth starts, clean emissions, and good fuel economy. If the signal goes missing or erratic, the ute or SUV can crank but not start, stall at idle, or fall into limp mode while lighting the check engine lamp.

The sensor isn’t a regular replacement item in the service schedule, but it benefits from a quick look whenever the vehicle is under the bonnet for major work. Owners and techs should check the wiring loom for rub-through near brackets, make sure the connector is clean and latched, and keep oil leaks from soaking the plug. Avoid blasting the area with a pressure washer. On the 1.5T, the CKP is mounted low on the engine block, reading a toothed wheel on the crank, access is typically from underneath after removing the engine under-cover.

Common clues it’s on the way out include:

• Cranks but won’t start, or intermittent stalling when hot
• Rough running, misfire feel, poor fuel economy
• Check engine light with codes such as P0335/P0336

When replacement is needed, stick with an OE-quality sensor and a fresh O-ring. Disconnect the battery, unplug the connector, remove the retaining bolt, and ease the sensor straight out. Lightly oil the new O-ring, seat the sensor square to avoid damage, and tighten the bolt to the factory spec from the workshop manual. Clear any fault codes, start the engine, and let it idle to stabilise, most cars won’t need a special relearn, but an idle learn and short road test is good practice. If a fault code returns, inspect the harness and tone wheel before condemning the new part.

Technical sources referenced: Mitsubishi Eclipse Cross (GK/GL) Workshop Manual – Engine Electrical (MFI), sections covering Crankshaft Position Sensor operation, testing and DTCs, Eclipse Cross Electrical Wiring Manual 2018–2021 showing CKP–ECM circuits, Mitsubishi ASA parts catalogue entries for the 4B40 engine’s crankshaft position sensor.

Popular questions about the 2021 Mitsubishi Eclipse Cross crank angle sensor

Where is the crank angle sensor on a 2021 Eclipse Cross?
It’s mounted low on the engine, positioned to read a toothed wheel on the crankshaft. On the 1.5L turbo petrol, access is usually from underneath after removing the undertray/splash shield. Look for a small two-wire or three-wire sensor held in with a single bolt and a sealed O-ring.

What symptoms point to a failing crank angle sensor?
Typical signs include a crank–no-start, sudden stalling once hot, erratic tachometer behaviour, and the check engine light. Scan tools commonly show P0335 or related codes. Because these symptoms overlap with fuel and ignition faults, proper diagnosis with live data is recommended before parts are swapped.

Does the crank angle sensor need routine replacement?
No. It’s not a scheduled-service item. Replace it only if it’s faulty or physically damaged. As preventative care, keep the connector clean and dry, repair any chafed wiring, and fix nearby oil leaks that could contaminate the plug. After replacement, clear codes and perform an idle stabilisation drive.