Parts for your 2022 Mitsubishi Asx-Knock sensor

2022 Mitsubishi ASX knock sensor — what it does and how to look after it

Technical sources confirm the 2022 Mitsubishi ASX is fitted with a knock sensor. The Mitsubishi Motors workshop manual for the ASX/RVR/Outlander Sport with the 4B11/4B12 MIVEC engines details the knock sensor in the Engine Control (Engine Electrical) section and lists related OBD-II diagnostics such as P0325, P0326, P0327 and P0328 for the knock sensor circuit. Mitsubishi’s global parts catalogues for the 4B11/4B12 engines also identify a dedicated knock sensor mounted to the engine block. On this basis, the knock sensor is both relevant to and used on the 2022 ASX.

The knock sensor on a 2022 ASX listens for high-frequency vibration caused by detonation (often called pinging) and lets the engine control unit fine‑tune ignition timing and fuelling in real time. That clever feedback helps the 2.0‑litre petrol engine run happily on local 91–95 RON fuels across Aussie and Kiwi conditions, while protecting pistons and rings from long-term damage. It also smooths power delivery and can shave a bit off fuel use when everything’s humming under the bonnet.

It’s not a routine “replace at X kilometres” item. In normal service, the sensor can last the life of the vehicle. Good practice is to include a quick visual check of the wiring and connector during major services—especially if the ASX has seen a lot of gravel roads, engine bay cleaning, or recent engine work. The sensor is bolted to the cylinder block (under the intake side on the 4B11), and it must be installed clean and torqued to the factory spec to read engine vibration correctly.

If the check engine light appears with DTCs such as P0325–P0328, or if there’s pinging under load, doughy performance, or poorer economy, a workshop scan for knock activity and timing retard is the go. Techs will rule out basics first—fuel quality, vacuum leaks, or noisy accessories—because false knock can mislead the ECU. If the sensor or its loom is confirmed faulty, replacement is straightforward but may require intake ducting or the manifold to be moved for access. Always refit with the correct torque, avoid dielectric grease on the sensor face, and keep coolant and oil away from the connector. Sticking with quality OEM-equivalent parts helps the ECU’s knock control stay crisp and accurate.

• Common triggers to inspect/replace: DTC P0325–P0328, audible pinging, recent engine work, water/pressure-wash exposure, or damaged wiring.
• Post-repair: clear codes, verify live knock counts/retard, and road test under load.

FAQs

Does the 2022 Mitsubishi ASX have a knock sensor?
Yes. The ASX with the 4B11/4B12 petrol engine uses a block-mounted knock sensor, documented in Mitsubishi’s workshop manual and corresponding OBD-II fault listings (e.g., P0325). It’s part of the ignition control strategy that manages timing and protects the engine from detonation.

Where is the knock sensor on a 2022 ASX?
It’s fixed to the engine block on the intake side, roughly central to the cylinders. Access is typically from above with some intake components moved, or from underneath depending on tools and hoist access. There’s one sensor for the four-cylinder engine.

When should the knock sensor be replaced?
There’s no scheduled interval. Replacement is recommended only when diagnosed faulty—usually after DTCs like P0325–P0328, confirmed by scan data and checks for wiring or mounting issues. Many live their whole life without needing attention if kept clean, dry, and correctly torqued.