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Kia Cerato: 2.0 Nu GDI Direct Injection Carbon Buildup on Intake Valves

2.0 Nu GDI Direct Injection Carbon Buildup on Intake Valves is a common engine fault on the Kia Cerato on the 2013–2018 cars, and we rate it major. Putting it right costs $700 to $1,500 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 17 documented faults on the Kia Cerato.

Vehicle
Kia Cerato
Engine
2.0L
Years
2013–2018
Fuel
petrol
System
Engine

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

All Kia Cerato faults17 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph for this fault yet. We would rather show none than show a picture of something else.

What goes wrong

The Nu 2.0 GDI engine in the third-generation Cerato (YD chassis, 2013–2018) uses direct injection, bypassing the intake valves with fuel. Over time, blow-by oil vapour deposits carbon on the back faces of the intake valves. Heavy buildup causes rough idle, misfires, and reduced performance. The fault is consistent with other Nu-engined Kia models and is expected from around 80,000 km without prior cleaning.

What you would notice

  • Rough or lumpy idle, particularly on cold start
  • Misfires or stumbling under light acceleration
  • Reduced performance or fuel economy
  • Check engine light with P0300–P0304 misfire codes

How to check it

Where to look. Intake ports and back of intake valves, accessed from intake manifold

Ask whether walnut blasting or intake valve cleaning has been carried out. Cars over 80,000 km without a documented clean are very likely to need the service. If a workshop inspection is possible: Use a borescope via the intake manifold ports to inspect the back of the intake valves — any grey or black carbon crust confirms buildup.

What it costs to put right

$700 to $1,500 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 intake been walnut-blasted or chemically cleaned?”
  • “How many kilometres has the car done and does it idle roughly when cold?”
  • “Has any misfire or check engine light appeared?”

Now check the Kia Cerato 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.

Kia Cerato buyer questions

Is 2.0 nu gdi direct injection carbon buildup on intake valves serious on a Kia Cerato?

We rate it major and common on the Kia Cerato. The Nu 2.0 GDI engine in the third-generation Cerato (YD chassis, 2013–2018) uses direct injection, bypassing the intake valves with fuel. Over time, blow-by oil vapour deposits carbon on the back faces of the intake valves. Heavy buildup causes rough idle, misfires, and reduced performance. The fault is consistent with other Nu-engined Kia models and is expected from around 80,000 km without prior cleaning.

How much does it cost to fix on a Kia Cerato?

$700 to $1,500 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 Kia Cerato years are affected?

Our research records this fault on the 2013–2018 Kia Cerato. 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?

Ask whether walnut blasting or intake valve cleaning has been carried out. Cars over 80,000 km without a documented clean are very likely to need the service. If a workshop inspection is possible: Use a borescope via the intake manifold ports to inspect the back of the intake valves — any grey or black carbon crust confirms buildup. Look here: Intake ports and back of intake valves, accessed from intake manifold