CriticalCommonEngine

Mazda Mazda3: L3-VET MPS Turbo Oil Feed Banjo Bolt Blockage

L3-VET MPS Turbo Oil Feed Banjo Bolt Blockage is a common engine fault on the Mazda Mazda3 on the 2006–2013 cars, and we rate it critical. Putting it right costs $300 to $4,500 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 37 documented faults on the Mazda Mazda3.

Vehicle: Mazda Mazda3
Engine: L3-VET
Years: 2006–2013
Fuel: petrol
Gearbox: manual
System: Engine

This page covers the Mazda Mazda3 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Mazda Mazda3 faults37 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 banjo bolt orifice restricting oil flow to the turbocharger bearing journal is prone to partial or complete blockage from carbonised engine oil sludge, particularly in engines that have not received regular short-interval oil changes. Restricted oil flow starves the turbo centre bearing of lubrication, generating rapid heat buildup in the bearing journal that progresses to shaft seizure and catastrophic turbine wheel failure if oil pressure loss is not detected promptly.

What you would notice

Blue or white smoke from exhaust under boost conditions
Turbocharger whine or grinding noise under load
Oil pressure warning light illuminating at idle
Oil staining or weeping around turbo oil feed line banjo fitting

How to check it

Where to look. Turbocharger oil feed banjo connection on top of the engine, driver's side exhaust manifold area

Check oil service history for extended change intervals.
Inspect turbo shaft for axial and radial play with inlet removed.
Review oil condition for evidence of prolonged degradation.
If a workshop inspection is possible: Remove the banjo bolt from the turbocharger oil feed inlet and inspect the internal orifice restrictor for carbon deposits and blockage.

Parts involved: Turbocharger.

What it costs to put right

$300 to $4,500 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 turbocharger ever been replaced or rebuilt?”
“Can you show full oil service history with intervals under 7,500 km?”
“Has the vehicle ever shown an oil pressure warning light?”
“Has the car ever produced blue or grey smoke under acceleration?”

Now check the Mazda Mazda3 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.

Mazda Mazda3 buyer questions

Is l3-vet mps turbo oil feed banjo bolt blockage serious on a Mazda Mazda3?

We rate it critical and common on the Mazda Mazda3. The banjo bolt orifice restricting oil flow to the turbocharger bearing journal is prone to partial or complete blockage from carbonised engine oil sludge, particularly in engines that have not received regular short-interval oil changes. Restricted oil flow starves the turbo centre bearing of lubrication, generating rapid heat buildup in the bearing journal that progresses to shaft seizure and catastrophic turbine wheel failure if oil pressure loss is not detected promptly.

How much does it cost to fix on a Mazda Mazda3?

$300 to $4,500 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 Mazda Mazda3 years are affected?

Our research records this fault on the 2006–2013 Mazda Mazda3. 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?

Check oil service history for extended change intervals. Inspect turbo shaft for axial and radial play with inlet removed. Review oil condition for evidence of prolonged degradation. If a workshop inspection is possible: Remove the banjo bolt from the turbocharger oil feed inlet and inspect the internal orifice restrictor for carbon deposits and blockage. Look here: Turbocharger oil feed banjo connection on top of the engine, driver's side exhaust manifold area