Parts for your 2018 Mitsubishi Outlander-Knock sensor

2018 Mitsubishi Outlander knock sensor — purpose, faults, and service tips

A knock sensor is fitted to 2018 Mitsubishi Outlander petrol and PHEV models. This is verified in technical sources including the Mitsubishi Motors Outlander/Outlander PHEV 2018 Service Manual (Group 13A – Engine Electrical, Knock Sensor), Mitsubishi ASA global parts catalogue for GF/GG/ZK/ZN chassis codes, and the factory diagnostic section listing OBD-II fault codes P0325–P0334 for knock sensor circuits. Many independent databases (e.g., ALLDATA/Mitchell) also document a block-mounted knock sensor for the 2.0L and 2.4L MIVEC four-cylinder engines. Diesel variants in some markets manage combustion differently and may not use a conventional knock sensor, but for petrol and PHEV Outlanders it’s very much part of the engine management.

On the 2018 Outlander, the knock sensor is a piezoelectric microphone bolted to the engine block. It listens for detonation (pinging) and lets the ECU gently trim ignition timing to protect the engine, keep it running sweet on Aussie and Kiwi fuels, and save a bit of juice. It’s one of those “fit-and-forget” parts that only gets attention when a fault light pops up.

Common clues it’s not happy include the Check Engine light with codes like P0325, dull performance, higher fuel use, or audible pinging under load. Because the ECU will usually pull timing to keep things safe, the car can feel a bit gutless when the sensor circuit has a drama.

Replacement isn’t a routine service item, but it can be checked while the bonnet’s up:

• Location: typically mid-block under the intake side on the 4B11/4B12 engines, with a single two-wire connector.
• Wiring: inspect the connector and loom for oil soak, heat hardening, or rubbed-through insulation. Many “sensor faults” are actually wiring issues.
• Mounting: if replacing, clean the block’s mating surface and tighten to the service manual torque (commonly around 20–25 N·m, always confirm spec). Over- or under-torque can skew readings.
• Avoid smearing sealant or paint under the sensor, it needs solid metal-to-metal contact to “hear” properly.
• During big services (spark plugs, intake work), keep the harness clipped and routed away from coils and hot spots.

There’s no set kilometre interval for knock sensor renewal, it’s replaced on condition. Using quality fuel, fixing vacuum and intake leaks promptly, and keeping the cooling system healthy all reduce knock events and help the sensor do its job. If a code returns after clearing, test the circuit per the factory flowchart before throwing parts at it, and stick with genuine or reputable aftermarket sensors so the ECU gets the right signal.

Popular questions

Where is the knock sensor on a 2018 Mitsubishi Outlander?
It’s bolted to the engine block on the intake side of the 2.0/2.4 petrol engines, roughly mid-way down. Access usually means removing the air box or intake ducting. On PHEV models with the 2.0L petrol, it’s in a similar spot on the block.

Can it be driven with a faulty knock sensor?
The car will usually run, but the ECU may pull timing to stay safe, so it can feel flat and use more fuel. Persistent detonation because the sensor isn’t reporting correctly can risk engine damage. Best to diagnose and sort it sooner rather than later.

Does the diesel Outlander have a knock sensor?
Many diesels, including some Outlander variants, don’t use a conventional knock sensor and rely on different combustion control strategies. If unsure, check by VIN in the Mitsubishi parts catalogue or service data for your exact engine code.