Parts for your 2025 Mitsubishi Eclipse cross-Knock sensor

2025 Mitsubishi Eclipse Cross Knock Sensor

Technical sources confirm the 2025 Mitsubishi Eclipse Cross is fitted with a knock sensor. Mitsubishi Motors Global Service Information (engine electrical for the 4B40 1.5L MIVEC turbo) outlines a block-mounted piezoelectric knock sensor used for ignition control, and the Mitsubishi ASA parts catalogue lists the sensor for the 4B40 engine. Factory diagnostic coverage in the Eclipse Cross workshop manual includes knock-sensor-related DTCs (P0325–P0328), which further verifies its presence.

On this turbocharged Eclipse Cross, the knock sensor is a quiet hero. It listens for the sharp vibrations that come from detonation (pinging) and lets the ECU pull timing or tweak fuelling before any real drama kicks off. That means smoother running, better efficiency, and crucially, protection for pistons and the turbo under Aussie and Kiwi conditions—whether it’s hot motorway hauls or steep climbs. The sensor effectively gives the engine a safety net when fuel quality varies or loads change suddenly, helping the 1.5T feel perky without risking knock damage.

As for servicing, the knock sensor is essentially maintenance-free. It doesn’t have a replacement interval and isn’t something that needs “tuning.” What does matter is keeping the surrounding bits in good nick. If the check engine light pops on with a knock-related code, it’s smart to rule out the basics first—old fuel, intake leaks, or carbon build-up can mimic knock. A technician will use a scan tool and live data to confirm whether the sensor signal is sensible under load. If the sensor itself is faulty, replacement is straightforward: it’s mounted to the engine block (typically beneath the intake side), and must be installed clean, on a dry, bare metal seat, and tightened to the workshop manual torque. Over-tightening or using sealant can dull the sensor’s “ear,” so following spec is key.

Going genuine or quality OEM-equivalent is the way to go, and after any replacement, clearing DTCs and performing any required idle or ECU learning steps keeps the engine happy. Using the recommended octane fuel also reduces the workload on the sensor and helps the ECU stay in its sweet spot for power and economy.

• Common signs of trouble: pinging under load, sluggish performance, worse fuel economy, and DTCs P0325–P0328.
• Tech tips: inspect wiring and connectors for heat damage, oil or coolant contamination, and make sure the sensor mounting point is spotless.

Popular questions

Where is the knock sensor on a 2025 Eclipse Cross?
It’s bolted to the engine block on the intake side, generally around the mid-block area near cylinders two and three. Access is usually from the top by moving the airbox/intake ducting, or from underneath on a hoist.

Does the knock sensor need regular replacement?
No. It’s maintenance-free and only gets replaced if testing shows a fault or there are persistent knock-sensor DTCs. If replacement’s needed, install on a clean, dry seat and tighten to the workshop manual torque.

What symptoms point to a bad knock sensor versus real engine knock?
A faulty sensor often triggers the check engine light with P0325–P0328 and can make the engine feel flat as the ECU plays it safe. Real knock tends to show up as a rattly ping under load or on hot days. A proper scan and road test under load helps tell them apart.