Parts for your 1998 Mitsubishi Pajero-Maf sensor

1998 Mitsubishi Pajero MAF sensor — what’s fitted and how to look after it

Drawing on technical sources — Mitsubishi Pajero NL Factory Service Manual (1997–1999) for the 6G74 V6 MPI, which specifies an air flow sensor (Karman vortex type) in the intake, the Mitsubishi 4M40 Diesel Engine Workshop Manual, which details a manifold absolute pressure (MAP) sensor with no mass air flow meter, plus Gregory’s and Haynes Pajero/Montero manuals and MMC parts catalogues — the 1998 Pajero uses a MAF sensor on petrol V6 models and does not use one on the 2.8L 4M40 turbo‑diesel. So the MAF is relevant to the 3.5 V6, diesel owners won’t have a MAF to service.

On the 1998 Pajero 3.5 V6 (6G74), the MAF sensor’s job is to measure how much air is actually entering the engine so the ECU can deliver the right amount of fuel and keep the big V6 running sweet as. Mitsubishi used a Karman vortex air flow meter here, mounted just after the airbox and before the throttle body. When it’s reading properly, you’ll get crisp throttle response, decent fuel economy, and fewer hassles under the bonnet.

As part of regular servicing, it’s smart to keep the MAF clean and protected. In Aussie and Kiwi conditions — think dusty unsealed roads and beach trips — give it a clean every 40,000–60,000 km, or sooner if you’re doing a lot of off‑road work. Use a dedicated MAF‑safe cleaner spray only, ignition off, unplug the connector, remove the two fasteners, spray the sensing path, and let it air‑dry completely. Don’t touch the sensing elements and don’t blow them with compressed air. While you’re there, fit a quality paper air filter and avoid heavily oiled filters that can contaminate the sensor film.

A quick driveway checklist that pays off:

• Inspect the intake hose between the MAF and throttle for splits — any unmetered air here will cause lean running and flat spots.
• Check the MAF connector pins for corrosion or loose fit, secure the harness so it doesn’t vibrate.
• If a Check Engine light pops up with airflow codes (commonly P0100–P0104), rule out intake leaks and filter issues before condemning the sensor.

When replacement’s needed, choose a genuine or quality OEM‑equivalent Karman vortex unit matched to the 6G74 calibration. Cheapies can cause rough idle or hunting. After fitting, the ECU may need a short relearn drive — a mix of suburban and highway kilometres usually does the trick. For owners of the 2.8 diesel, relax — your engine uses MAP and boost control, not a MAF, so none of the above applies.

Popular questions

Where is the MAF sensor on a 1998 Pajero V6 and how do you get to it?

On the 3.5 V6 it sits on the outlet side of the airbox, inline with the intake tube before the throttle body. Pop the bonnet, unplug the electrical connector, and remove the two screws or clamps to lift it out. Always handle it gently and keep dust out of the open intake while it’s removed.

Does the 1998 2.8 turbo‑diesel Pajero have a MAF sensor?

No. The 4M40 diesel uses a MAP sensor and intake air temperature with fuel delivery managed by the pump/ECU, so there’s no mass air flow meter fitted. If you’re chasing driveability issues on the diesel, look at boost leaks, MAP signal, and pump calibration instead.

Can a MAF sensor be cleaned or is replacement the only fix?

Light contamination from dust or oil film can often be sorted with a proper MAF cleaner spray. If cleaning and intake leak checks don’t restore smooth running or clear airflow fault codes, the sensor may be out of spec and replacement is the reliable fix.