Parts for your 2017 Mitsubishi Eclipse cross-Knock sensor

2017 Mitsubishi Eclipse Cross knock sensor: what it does and when to sort it

Yes, the 2017-build Mitsubishi Eclipse Cross is fitted with a knock sensor. Technical sources that cover the launch-year Eclipse Cross (GK/GL series) with the 1.5‑litre turbo-petrol 4B40 engine specify a piezoelectric knock sensor mounted on the cylinder block. This is detailed in the Mitsubishi Motors Service Manual (Eclipse Cross GK/GL, Engine Electrical/ECU and Sensors sections) and supported by the factory DTC list covering P0325–P0328 knock-sensor faults. The Mitsubishi ASA parts catalogue for GK/GL also lists a dedicated knock sensor for the 4B40 engine.

On this model, the knock sensor is the engine’s early-warning system for detonation (pinging). It “listens” for vibration signatures that point to abnormal combustion, then the ECU trims ignition timing and, if needed, turbo boost to keep things smooth and protect the pistons, rings and bearings. That lets the Eclipse Cross deliver solid torque on our varied Aussie and Kiwi fuels while keeping emissions in check. If the sensor or wiring plays up, the ECU typically throws a check engine light and runs a safer, softer tune — you’ll notice dulled performance and higher fuel use.

• Common signs of trouble include rattling/pinging under load, hesitation, poor fuel economy and a check engine light (often P0325–P0328).

There’s no scheduled replacement for the knock sensor on the Eclipse Cross, but it deserves attention during servicing. Under the bonnet, check that the sensor’s connector is snug and the harness isn’t chafed against the block or brackets. Oil leaks or coolant weeps can contaminate connectors, so clean and fix any leaks you spot. Because the sensor relies on a solid, metal-to-metal mounting, avoid paint, sealant or corrosion under it.

When replacement is needed, use an OE-quality sensor matched to the VIN. Fit it to a cool engine, ensure the mating surface on the block is clean, and tighten to the workshop manual torque spec — over- or under-tightening can skew readings. Don’t twist the body during removal/installation, hold the connector end steady. After fitting, clear fault codes with a scan tool and perform a road test so the ECU can relearn knock control. If a code returns, inspect the harness and earth points, and confirm fuel quality. Keeping the knock sensor healthy helps the 1.5T run crisp, efficient and knock-free across Aussie and Kiwi conditions.

Where is the knock sensor on a 2017 Eclipse Cross?

It’s bolted to the cylinder block, generally centered between cylinders beneath the intake side of the engine. Access varies by tools and experience — some techs reach it from above with intake components moved aside, others prefer access from underneath. Always confirm location in the Eclipse Cross GK/GL workshop manual.

What fault codes point to a bad knock sensor?

Typical Eclipse Cross codes are P0325 (circuit), P0326 (range/performance), P0327 (low input) and P0328 (high input). These can stem from a failed sensor, damaged wiring, poor mounting/torque, or even ECU earth issues. Verify wiring integrity and mounting before replacing the sensor.

Is it safe to drive with a knock sensor fault?

The ECU will usually pull timing to protect the engine, so it’s generally safe to drive gently to a workshop. Expect reduced power and higher fuel use. Avoid towing, steep climbs or hard acceleration until the fault is diagnosed and fixed.