MajorCommonEngine

Peugeot 308: 1.2 PureTech Intake Valve Carbon Buildup

1.2 PureTech Intake Valve Carbon Buildup is a common engine fault on the Peugeot 308 on the 2013–2021 cars, and we rate it major. Putting it right costs $500 to $1,400 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 26 documented faults on the Peugeot 308.

Vehicle: Peugeot 308
Engine: 1.2L
Years: 2013–2021
Fuel: petrol
System: Engine

This page covers the Peugeot 308 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Peugeot 308 faults26 documented faults on this model

What you are looking at

No photograph available

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

What goes wrong

The 1.2 PureTech EB2DT engine uses gasoline direct injection (GDI), meaning fuel is injected directly into the combustion chamber rather than the intake port. As a result, intake valves are never wetted and cleaned by fuel spray, and carbon deposits from blow-by gases accumulate on the valve stems and back faces over time. These deposits restrict airflow, cause rough cold idle, hesitation on initial acceleration, and power loss. The condition progressively worsens and cannot be resolved by fuel additives — the carbon bonds to the valve metal and requires either walnut shell blasting through the intake ports (with intake manifold removed) or chemical decarbonisation under pressure. The condition typically becomes noticeable above 80,000 km and can be severe by 120,000 km in vehicles with no oil catch can fitted.

What you would notice

Rough idle especially when cold
Hesitation or stumble on light throttle from rest
Progressive loss of power particularly below 3000 rpm
Occasional misfires logged under light load
Fuel consumption increase as combustion efficiency drops

How to check it

Where to look. Intake valve faces and stems inside the cylinder head ports, accessible after removing the intake manifold on the 1.2 PureTech engine

Check current odometer and ask about idle quality and cold-start hesitation. For vehicles over 80,000 km with no record of intake cleaning, budget for walnut blasting as a maintenance item. If a workshop inspection is possible: An OBD scan may show lean mixture compensation or misfire codes. Use a borescope inserted through the spark plug holes or removed injector ports to inspect valve faces for carbon deposits.

Parts involved: Intake manifold.

What it costs to put right

$500 to $1,400 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 intake valve carbon been cleaned at any point — walnut blasting or chemical decarbonisation?”
“Does the car idle smoothly when cold and accelerate cleanly from low speed?”
“What is the current mileage and has the car predominantly done city or highway driving?”

Now check the Peugeot 308 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.

Peugeot 308 buyer questions

Is 1.2 puretech intake valve carbon buildup serious on a Peugeot 308?

We rate it major and common on the Peugeot 308. The 1.2 PureTech EB2DT engine uses gasoline direct injection (GDI), meaning fuel is injected directly into the combustion chamber rather than the intake port. As a result, intake valves are never wetted and cleaned by fuel spray, and carbon deposits from blow-by gases accumulate on the valve stems and back faces over time. These deposits restrict airflow, cause rough cold idle, hesitation on initial acceleration, and power loss. The condition progressively worsens and cannot be resolved by fuel additives — the carbon bonds to the valve metal and requires either walnut shell blasting through the intake ports (with intake manifold removed) or chemical decarbonisation under pressure. The condition typically becomes noticeable above 80,000 km and can be severe by 120,000 km in vehicles with no oil catch can fitted.

How much does it cost to fix on a Peugeot 308?

$500 to $1,400 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 Peugeot 308 years are affected?

Our research records this fault on the 2013–2021 Peugeot 308. 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.