MajorVery commonEngine

Mitsubishi Pajero: 4M41 3.2L DI-D EGR Valve Sticking and Inlet Manifold Carbon Build-Up

4M41 3.2L DI-D EGR Valve Sticking and Inlet Manifold Carbon Build-Up is a very common engine fault on the Mitsubishi Pajero on the 1999–2006 cars, and we rate it major. Putting it right costs $500 to $2,000 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 39 documented faults on the Mitsubishi Pajero.

Vehicle: Mitsubishi Pajero
Engine: 4M41
Years: 1999–2006
Fuel: diesel
System: Engine

This page covers the Mitsubishi Pajero as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Mitsubishi Pajero faults39 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Intake manifold or EGR valve yet. We would rather show none than show a picture of a different part.

What goes wrong

The 4M41 accumulates heavy carbon deposits in the EGR valve and inlet manifold over time, mirroring the pattern seen in the earlier 4M40. The EGR valve can stick open, causing excessive exhaust gas recirculation that degrades combustion quality, increases soot loading, and accelerates inlet manifold blockage. A fully restricted manifold noticeably reduces engine output. EGR delete using aftermarket blanking plates is a common owner fix; professional inlet manifold cleaning restores airflow without modifying emissions equipment.

What you would notice

Rough idle and engine surging under light throttle
Black or blue smoke on cold start or acceleration
Reduced power output and sluggish response
Increased fuel consumption
Check engine light with EGR-related fault codes

How to check it

Where to look. EGR valve on exhaust side of engine, inlet manifold on top of engine feeding all four cylinders

Inspect the EGR valve for carbon fouling — the valve butterfly should move freely.
Shine a torch into the inlet manifold to assess airflow restriction from carbon lining.
Check for diagnostic fault codes relating to EGR position or flow.
Note if an aftermarket EGR blanking plate has been fitted.

Parts involved: Intake manifold, EGR valve.

What it costs to put right

$500 to $2,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the EGR system been cleaned, serviced, or blanked off?”
“Are there any active or stored fault codes?”
“What is the service history for the air filtration and fuel systems?”

Now check the Mitsubishi Pajero you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Mitsubishi Pajero buyer questions

Is 4m41 3.2l di-d egr valve sticking and inlet manifold carbon build-up serious on a Mitsubishi Pajero?

We rate it major and very common on the Mitsubishi Pajero. The 4M41 accumulates heavy carbon deposits in the EGR valve and inlet manifold over time, mirroring the pattern seen in the earlier 4M40. The EGR valve can stick open, causing excessive exhaust gas recirculation that degrades combustion quality, increases soot loading, and accelerates inlet manifold blockage. A fully restricted manifold noticeably reduces engine output. EGR delete using aftermarket blanking plates is a common owner fix; professional inlet manifold cleaning restores airflow without modifying emissions equipment.

How much does it cost to fix on a Mitsubishi Pajero?

$500 to $2,000 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Mitsubishi Pajero years are affected?

Our research records this fault on the 1999–2006 Mitsubishi Pajero. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Inspect the EGR valve for carbon fouling — the valve butterfly should move freely. Shine a torch into the inlet manifold to assess airflow restriction from carbon lining. Check for diagnostic fault codes relating to EGR position or flow. Note if an aftermarket EGR blanking plate has been fitted. Look here: EGR valve on exhaust side of engine, inlet manifold on top of engine feeding all four cylinders