Parts for your 1995 Mitsubishi Pajero-Knock sensor

1995 Mitsubishi Pajero Knock Sensor: What’s Fitted and What To Do About It

For a 1995 Mitsubishi Pajero, whether a knock sensor is relevant depends on the engine. The petrol V6 models (3.0L 6G72 and 3.5L 6G74) are fitted with a knock sensor, while the diesel variants (2.8L 4M40 and 2.5L 4D56) are not. This is backed by the Mitsubishi Pajero/Montero Factory Service Manual (Engine Control/MPI sections outlining the knock sensor’s role and ECU ignition timing control), the Mitsubishi ASA Electronic Parts Catalogue listing “sensor, knock” for 6G72/6G74 engines, and general repair manuals such as Gregory’s/Haynes which describe the knock sensor on petrol EFI Pajeros of this era.

For petrol V6 owners, the knock sensor is a quiet overachiever. Mounted on the engine block (in the V valley under the intake on the V6), it “listens” for detonation and lets the ECU trim ignition timing to protect the engine. That means smoother running on dodgy fuel, better longevity, and decent economy without pinging under load. If the sensor or its wiring goes flaky, the ECU usually drops timing into a safe zone. The vehicle still runs, but it can feel a bit gutless, chew more fuel, and may log a fault code.

Replacement is straightforward but fiddly on the V6 because the intake gear often needs to come off to reach the sensor. They’ll want a quality, OEM-spec unit and the correct torque on installation—over-tightening can kill a new sensor, and under-tightening can make it deaf. During servicing, it’s smart to inspect the harness for brittle insulation or oil contamination and confirm the connector is clean and snug. If the Pajero is used for touring or towing in Aussie or Kiwi heat, pairing a healthy knock sensor with the right octane fuel is a cheap insurance policy.

Typical signs a Pajero might need a knock sensor check include:

• Noticeable loss of power or sluggishness climbing hills
• Worse fuel economy without another clear cause
• Audible pinging under load on the wrong fuel
• Stored ECU fault related to knock detection

Why diesels don’t use one here: the 4M40/4D56 diesels of 1995 rely on mechanical injection control and inherently noisy combustion, a conventional petrol-style knock sensor isn’t part of their control strategy in this generation.

Technical sources referenced: Mitsubishi Pajero/Montero Factory Service Manual (Engine Control/MPI), Mitsubishi ASA Electronic Parts Catalogue (V20 series, 6G72/6G74 “sensor, knock”), Gregory’s/Haynes Pajero/Montero service manuals (EFI petrol engine management).

Popular questions

Where is the knock sensor on a 1995 Pajero V6?
It sits on the engine block in the V between the cylinder banks, usually beneath the intake manifold on the 6G72/6G74. Access commonly requires removing top-side intake components. When refitting, it should be tightened to the factory spec and kept free of oil and coolant to avoid false readings.

Can a dodgy knock sensor damage the engine?
The ECU generally plays it safe and retards timing if it can’t trust the sensor, so immediate damage is unlikely. That said, if wiring is damaged or the sensor is completely dead, the ECU might not catch real knock. It’s best to fix a suspect sensor promptly to keep performance, economy, and engine protection on point.

Does the 2.8 diesel 1995 Pajero have a knock sensor?
No. The 4M40 diesel in this era doesn’t run a petrol-style knock sensor. Its injection and combustion control don’t depend on knock feedback, and diesel combustion noise would make such a sensor impractical for the strategy used on these engines.