Parts for your 2006 Mitsubishi Pajero-Knock sensor

2006 Mitsubishi Pajero knock sensor – what’s fitted and what to know

For the 2006 Mitsubishi Pajero, a knock sensor is fitted on the petrol V6 models (6G75 3.8-litre), but it isn’t used on the 3.2 Di‑D 4M41 diesel. This is per Mitsubishi workshop literature for the 6G7 engines (which details a block-mounted knock sensor and related DTCs like P0325/P0330), the Mitsubishi ASA/EPC parts catalogue listings for 2006 NS/NP petrol variants, and the 4M41 common‑rail diesel engine manual (which controls combustion via pilot injection and does not list a knock sensor).

On petrol V6 Pajeros, the knock sensor listens for detonation (that metallic “ping” under load) and signals the ECU to trim ignition timing before things get nasty. It’s a quiet hero that keeps the 6G75 running smoothly on Aussie and Kiwi fuels, protecting the engine under the bonnet when towing, climbing hills, or cruising long kilometres. With a healthy sensor, timing stays as advanced as safely possible, giving decent torque and fuel economy without risking piston or bearing damage.

There’s no scheduled service interval for the knock sensor, it’s a fit-and-forget item until it fails or wiring plays up. If the check engine light pops up with a knock sensor code, or the Paj feels flat, uses more petrol than usual, or starts to ping under load, it’s time to check it. On the 6G75, the sensor is bolted to the engine block and relies on correct torque and a clean mounting face to “hear” properly. Replacement is straightforward for a pro, but may involve intake components coming off for access, so many owners do it alongside other jobs (plugs, manifold gaskets) to save time.

• Common signs of trouble: CEL with P0325/P0330, audible pinging, sluggish performance, poor economy.
• Good practice: keep connectors clean and looms secure, fix oil/coolant leaks that can contaminate the sensor, and use the recommended octane for your local market.
• When replacing: use a quality OE-equivalent sensor, ensure the mating surface is clean, route the harness away from heat, and tighten to the specified torque from the workshop manual.

Diesel 3.2 Di‑D owners won’t find a knock sensor to replace. That engine manages combustion noise and timing via pilot injection and its suite of sensors (crank, cam, rail pressure), so a knock sensor simply isn’t part of the design, as confirmed in the 4M41 diesel engine manual and EPC listings.

Technical sources referenced: Mitsubishi Pajero/Montero 2006 Service Manual (Engine/Engine Electrical – 6G7 series), Mitsubishi ASA/EPC for 2006 NS/NP, 4M41 Common-Rail Diesel Engine Workshop Manual, and major service data providers used in AU/NZ workshops.

Does the 3.2 Di‑D 2006 Pajero have a knock sensor?

No. The 4M41 common‑rail diesel controls combustion via pilot injection and ECU mapping using crank/cam position and fuel pressure data, so it doesn’t use a knock sensor. That’s why you won’t see one in the diesel engine diagrams or parts listings.

Where is the knock sensor on the 3.8 V6, and how tricky is replacement?

It’s mounted to the engine block on the V6, beneath the intake area. Access can be tight, many techs remove intake components for room. With the right torque and a clean mounting point, it’s a tidy job for a workshop and often paired with spark plug or manifold gasket work to save labour.

Is it safe to drive with a faulty knock sensor?

The ECU usually dials back timing as a safety net, so the engine will run but may feel down on power and burn more fuel. Continued driving isn’t ideal—get it diagnosed and sorted to protect the engine and restore proper performance.