Parts for your 2023 Mitsubishi Asx-Knock sensor

2023 Mitsubishi ASX knock sensor — what it does and how to look after it

The 2023 Mitsubishi ASX is fitted with a knock sensor. This is documented in Mitsubishi’s ASX/Lancer/Outlander (GA2W platform) service information for the 4B11 2.0-litre MIVEC engine, where the knock sensor (KS) is listed as part of the multi‑point fuel injection and ignition control system and associated with diagnostic code P0325 (Knock Sensor Circuit). The 4B1 Engine Workshop Manual shows a block‑mounted piezoelectric sensor beneath the intake side, and Mitsubishi’s ASA electronic parts catalogue lists a knock sensor for GA2W 4B11/4B12 applications. For markets where the 2023 ASX is the Renault Captur–based model, the Renault technical data for the 1.0/1.3 TCe and hybrid engines likewise specifies a block‑mounted knock sensor. So whichever 2023 ASX someone has, a knock sensor is relevant and used.

On the ASX, the knock sensor listens for high‑frequency vibration caused by detonation (pinging). The engine control unit uses that signal to trim ignition timing and protect the engine while keeping performance and fuel economy tidy on Aussie and Kiwi petrol. It’s a quiet hero: when it’s healthy, the driver won’t notice it at all.

It’s not a routine service item, and there’s no cleaning or adjustment required. Replacement is only needed if there’s a fault or damage to the sensor or its harness. Typical warning signs include:

• Check Engine light with codes like P0325
• Audible pinging under load, sluggish performance, or higher fuel use
• Intermittent power loss, especially on hot days or hills

On the 4B11 ASX, the knock sensor sits on the engine block under the intake side. If replacement’s required, disconnect the battery, access the sensor from above (removing intake ducting) or from underneath if that’s easier, keep the mating face clean and dry, and route the loom exactly as from factory so it doesn’t pick up false noise. Tightening torque is critical for signal accuracy — expect it to be in the ~20–25 N·m range, but always follow the exact spec in Mitsubishi service data for the specific VIN.

A couple of easy care tips: stick with the recommended fuel grade, fix intake/exhaust leaks promptly, and avoid pressure‑washing electrical connectors around the block. If the ASX ever logs a knock‑sensor fault, it’s smart to check engine earths and the connector before throwing parts at it, then replace with a quality sensor and correct torque.

Does the 2023 Mitsubishi ASX have a knock sensor?

Yes. Mitsubishi’s GA2W service manual for the 4B11 engine shows a block‑mounted knock sensor and related diagnostics, and the parts catalogue lists it for the ASX. The Captur‑based 2023 ASX powertrains also use one.

Where is the knock sensor on a 2023 ASX?

It’s mounted on the engine block on the intake side, roughly mid‑block. Access is usually from above with some intake pieces moved, or from underneath on a hoist.

Should it be replaced during regular servicing?

No. It’s a fit‑and‑forget item unless there’s a fault code, wiring damage, or confirmed sensor failure. When replacing, use the correct torque and don’t apply sealant.