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Mitsubishi Eclipse Cross: 4B40 1.5T turbo inlet hose split at boost clamp

4B40 1.5T turbo inlet hose split at boost clamp is a common engine fault on the Mitsubishi Eclipse Cross on the 2017 onward cars, and we rate it major. Putting it right costs $180 to $480 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 21 documented faults on the Mitsubishi Eclipse Cross.

Vehicle
Mitsubishi Eclipse Cross
Engine
4B40
Years
2017 onward
Fuel
petrol
Gearbox
cvt
System
Engine

This page covers the Mitsubishi Eclipse Cross 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 Eclipse Cross faults21 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Turbocharger yet. We would rather show none than show a picture of a different part.

What goes wrong

The silicone turbo charge-air inlet hose on the 4B40 1.5-litre turbocharged engine develops splits or tears at the factory crimp-clamp contact points. Under sustained boost pressure the hose delaminates internally or splits longitudinally at the clamp bead, causing a sudden loss of boost pressure, rough idle, hesitation under acceleration, and the engine entering limp-home mode. Fault codes P0299 (turbo underboost) or P0234 may appear. Failure is accelerated by repeated heat cycling and is most commonly observed between 40,000 and 100,000 km in warmer NZ and AU climates.

What you would notice

  • Sudden loss of power and boost pressure under acceleration
  • Hissing or whooshing sound from engine bay under load
  • Check engine light with P0299 turbo underboost code
  • Rough idle following a boost event
  • Engine entering limp-home mode at higher rpm

How to check it

Where to look. Engine bay — turbocharger compressor outlet to intercooler and throttle body charge-air hose assembly

With engine cold, trace the turbo charge-air hose from the compressor outlet through the intercooler to the throttle body. Squeeze the hose along its full length and at each clamp contact point feeling for soft spots, longitudinal cracks, or internal delamination blistering. Check clamp tightness and inspect for black soot streaking at clamp locations indicating boost gas leakage.

Parts involved: Turbocharger.

What it costs to put right

$180 to $480 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 turbo inlet hose or any charge-air hose been replaced?”
  • “Has the vehicle ever entered limp mode or shown a check engine light?”
  • “Are there any stored or pending fault codes related to boost pressure?”

Now check the Mitsubishi Eclipse Cross 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 Eclipse Cross buyer questions

Is 4b40 1.5t turbo inlet hose split at boost clamp serious on a Mitsubishi Eclipse Cross?

We rate it major and common on the Mitsubishi Eclipse Cross. The silicone turbo charge-air inlet hose on the 4B40 1.5-litre turbocharged engine develops splits or tears at the factory crimp-clamp contact points. Under sustained boost pressure the hose delaminates internally or splits longitudinally at the clamp bead, causing a sudden loss of boost pressure, rough idle, hesitation under acceleration, and the engine entering limp-home mode. Fault codes P0299 (turbo underboost) or P0234 may appear. Failure is accelerated by repeated heat cycling and is most commonly observed between 40,000 and 100,000 km in warmer NZ and AU climates.

How much does it cost to fix on a Mitsubishi Eclipse Cross?

$180 to $480 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 Eclipse Cross years are affected?

Our research records this fault on the 2017 onward Mitsubishi Eclipse Cross. 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?

With engine cold, trace the turbo charge-air hose from the compressor outlet through the intercooler to the throttle body. Squeeze the hose along its full length and at each clamp contact point feeling for soft spots, longitudinal cracks, or internal delamination blistering. Check clamp tightness and inspect for black soot streaking at clamp locations indicating boost gas leakage. Look here: Engine bay — turbocharger compressor outlet to intercooler and throttle body charge-air hose assembly