Parts for your 2015 Mitsubishi Asx-Knock sensor

2015 Mitsubishi ASX knock sensor – what it does, where it lives, and when to replace it

Based on Mitsubishi Motors workshop literature for the ASX/RVR/Outlander Sport (XA/GA series, 2010–2017) and the factory OBD-II diagnostics (which include DTCs P0325, P0327 and P0328 for the knock sensor circuit), the 2015 Mitsubishi ASX petrol engines (notably the 2.0L 4B11 common in AU/NZ, and the 1.6L 4A92 in some markets) are fitted with a knock sensor bolted to the cylinder block. The Mitsubishi ASA electronic parts catalogue also lists a knock sensor for these VIN ranges. Diesel variants don’t use a traditional knock sensor for spark control, but the petrol models do—so the knock sensor is absolutely relevant on a 2015 ASX.

On the ASX petrol, the knock sensor is a piezoelectric microphone of sorts that “listens” for pinging (detonation) through the engine block. When it hears knock, it signals the ECU to trim ignition timing and protect the engine. That keeps performance, fuel economy, and reliability in the sweet spot—even on hot days or when fuel quality isn’t ideal.

It isn’t a scheduled service item, but it pays to keep an eye on it during regular servicing under the bonnet:

• Look for damaged wiring or a loose/contaminated connector under the intake side of the block.
• If the Check Engine light appears with P0325/P0327/P0328, inspect the sensor and loom before throwing parts at it.
• Use the correct octane petrol for your ASX to reduce the ECU’s workload managing knock.

Typical signs of a crook knock sensor or circuit on an ASX include:

• Check Engine light and stored knock-sensor codes
• Sluggish performance, dull throttle response, or poor fuel economy
• Occasional pinging under load if timing can’t be pulled back correctly

Replacement is straightforward for a competent home mechanic, but access is a bit tight beneath the intake manifold on the block:

1. Let the engine cool and disconnect the battery.
2. Unplug the two‑pin connector and remove the sensor carefully.
3. Install the new OEM-quality sensor on a clean, flat mounting face—no thread tape or sealant.
4. Tighten to the manufacturer’s specified torque and route the harness exactly as per the manual to avoid false knock from vibration.
5. Clear codes, then road‑test, the ECU will relearn knock control over a few drive cycles.

Because the ECU relies on clean signals, over‑tightening, incorrect aftermarket parts, or a chafed loom can all cause dramas. Sticking with the factory torque spec and an OEM sensor keeps the ASX happy for many kilometres.

Popular questions about the 2015 Mitsubishi ASX knock sensor

Where is the knock sensor on a 2015 ASX?
It’s mounted to the cylinder block on the intake side, beneath the intake manifold area, with a single two‑pin connector. Access is tight from above, some prefer reaching it from underneath with the vehicle safely supported.

Do I need to replace the knock sensor during regular servicing?
No. It’s not a routine replacement item. Only replace it if there are fault codes, confirmed signal issues, or physical damage. During services, a quick visual of the connector and loom is enough.

Can bad fuel trigger knock‑sensor fault codes?
Low‑quality petrol can increase knock activity, which the ECU manages, but circuit fault codes (like P0325/P0327/P0328) usually point to wiring, connector, or sensor issues rather than just fuel quality. If in doubt, use the recommended octane and recheck.