Parts for your 2003 Mitsubishi Pajero-Knock sensor

2003 Mitsubishi Pajero Knock Sensor — what’s fitted and how to look after it

Based on technical references including the Mitsubishi Pajero NM/NP Workshop Manual (2000–2006, Engine—MPI/ECI and 4M41 sections), the Mitsubishi ASA electronic parts catalogue, and Mitsubishi OBD-II DTC listings (which include P0325/P0330 for petrol models), the 2003 Pajero’s V6 petrol engines (6G74 3.5L and 6G75 3.8L) are fitted with a knock sensor mounted on the engine block in the valley beneath the intake. The 3.2 Di‑D (4M41) diesel does not use a knock sensor. So, the knock sensor is relevant to petrol 2003 Pajeros, but not to the diesel variant.

On the petrol 2003 Pajero, the knock sensor is the quiet achiever that keeps the V6 happy on Aussie and Kiwi fuel. It “listens” for pinging (detonation) and lets the ECU trim ignition timing so the engine runs smoothly without hurting itself. That matters on long climbs, towing, or when fuel quality varies between servo stops.

When it’s healthy, owners usually don’t notice it at all. When it’s not, they might see a check engine light and codes like P0325 or P0330, feel dull performance, hear light rattling under load, or notice higher fuel use. Because it lives under the intake manifold on the V6, replacement is a bit of a job, but it’s straightforward for a competent tech following the factory manual.

As part of regular servicing, it’s worth:

• Scanning for stored knock-sensor codes if the MIL has flashed up or the engine feels flat.
• Inspecting the harness and connector any time the upper intake is off (brittle wiring and oil contamination can cause false knock signals).
• Refitting with a quality sensor and a clean, flat mounting surface, tighten to the workshop-manual torque and don’t use thread sealant that can insulate the sensor.
• Keeping up with good-quality petrol (the system adapts, but consistent 95 RON helps on hot days or when towing).

If a replacement is needed, it’s smart to pair the new sensor with a fresh pigtail/connector if the old one looks tired. After refitting, clear codes and run a road test with live data to confirm knock activity and timing advance look normal. For diesel 3.2 Di‑D owners: there’s no knock sensor in that engine family, rough running or rattle under load points elsewhere (injectors, timing, or mounts) rather than a KS fault.

Popular questions about 2003 Mitsubishi Pajero knock sensors

Where is the knock sensor on a 2003 Pajero?
On the V6 petrol (6G74/6G75), it’s mounted on the engine block in the V between the cylinder banks, beneath the upper intake manifold. Access usually requires removing the upper plenum. The 3.2 Di‑D diesel (4M41) does not have a knock sensor.

What are the symptoms of a bad knock sensor on a Pajero?
Common clues are a check engine light with codes like P0325/P0330, lacklustre acceleration, poor fuel economy, and audible pinging under load. Sometimes the ECU plays it safe and pulls timing, so it just feels sluggish without any obvious rattle.

Can a 2003 Pajero diesel show a knock-sensor fault code?
Not normally. The 4M41 diesel isn’t equipped with a knock sensor, so a KS code on a diesel is unlikely. If a scanner shows one, double-check the vehicle/engine selection, scan tool definitions, and wiring—another circuit or sensor may be misread.