P0299 on Renault: causes, affected engines and fix

Documented faults in Renault engines that can trigger P0299

Grouped by engine or model, from most to least important. These are faults with the turbo and with the EGR valve: not all of them will necessarily set the code, and only a diagnosis confirms the cause on your car.

1.6 dCi

In Espace V, Kadjar, Mégane III, Mégane IV, Scénic III, Scénic IV and Talisman

- High severityFrequency: CommonTurboPremature turbocharger failure or breakageThe 1.6 dCi turbo fails fairly often, sometimes at low mileage: fiches-auto documents failures between 23,000 and 113,000 km in the Kadjar, Qashqai II, X-Trail III and Espace V, with loss of power and, in several cases, the manufacturer refusing to cover the cost out of warranty.Repair (garage): €3,000
- Medium severityFrequency: CommonEmissions controlBlocked or failed EGR valveThe 1.6 dCi EGR valve gets dirty and can stick or stop sealing, especially in cars used around town. Fiches-auto flags it as one of the most repeated defects in the Renault Espace V and documents a case of double replacement in a Kadjar (at 85,000 km and again at 95,000 km).Repair (garage): €250–€1,000

1.9 dCi

In Espace IV, Laguna I, Laguna II, Mégane I, Mégane II, Scénic I and Scénic II

2.0 dCi

In Espace IV, Koleos I, Laguna III, Mégane II and Mégane III

1.5 dCi

In Captur I, Clio II, Clio III, Clio IV, Fluence, Kadjar and 11 more models

1.0 TCe / SCe

In Captur II and Clio V

- Medium severityFrequency: CommonTurboMetallic noise or vibration from the turbo wastegateThe 1.0 TCe/ECO-G can develop a metallic noise or vibration from the turbo wastegate valve, especially when cold. It is the fault that recurs most across several independent sources; in a minority of cases it ends in a turbo replacement.

1.3 TCe

In Arkana, Captur II, Clio V, Kadjar, Mégane IV and Scénic IV

- High severityFrequency: OccasionalTurboTurbo actuator (wastegate) faultOn 1.3 TCe/DIG-T engines built up to 19 June 2020, the clip that holds the turbo wastegate valve rod may be missing or come loose, causing a loss of power with the injection warning light on. If the rod is left with too much play, the whole turbo has to be replaced.Repair (garage): €400–€700

2.3 dCi (M9T)

In Master III

- High severityFrequency: OccasionalEmissions controlClogged or broken EGR valve damaging the turboThe 2.3 dCi's EGR valve clogs with soot in urban use and, if it breaks, its fragments can damage the turbo. A French source cites bills of €1,200 to €2,300 for the EGR and turbo together.Repair (garage): €1,200–€2,300

0.9 TCe

In Captur I, Clio IV and Twingo III

- High severityFrequency: RareTurboTurbocharger wear or failureThe 0.9 TCe's turbo can lose performance or fail, although the available statistics put it as an infrequent fault on this specific engine.

Common causes of P0299 on any make

From most to least likely, according to the sources.

1Air leaks in the boost hoses or the intercooler, from a split hose or a loose clamp: this is the most common cause.^[1][2]
2Faulty wastegate or its actuator, or a seized turbo, which do not regulate the pressure properly.^[1][2]
3Worn or faulty turbo.^[1][2]
4Blocked intercooler or intake.^[2]

What to check first

The first diagnostic steps, from the most likely and cheapest to check to the most expensive.

1First check the boost hoses and the intercooler: cracks, oil at the joints and loose clamps. This is the most common cause and the cheapest to repair.^[1][2]
2With a diagnostic tool, compare the boost pressure requested by the control unit with the pressure measured by the sensor while you accelerate.^[2]
3Check that the wastegate actuator (or variable geometry actuator) moves and that its rod travels the full stroke, and check the solenoid valve that controls it.^[1][2]

Full guide to P0299: symptoms, diagnosis and whether you can drive

Frequently asked questions

Which Renault engines have faults that can trigger P0299?

1.6 dCi (2 faults), 1.9 dCi (2 faults), 2.0 dCi (2 faults), 1.5 dCi (2 faults), 1.0 TCe / SCe (1 fault) and 1.3 TCe (1 fault). Each fault has its own page with the affected years and versions, the symptoms and the repair cost.

What does code P0299 mean on a Renault?

Turbocharger or supercharger "A": insufficient boost pressure (underboost). The engine control unit has detected that the turbo is not delivering the expected boost pressure: the actual pressure falls below what the engine management requests. That is why, to diagnose it, the requested pressure is compared with the measured pressure using a diagnostic tool. It is a generic OBD-II code: it means the same on a Renault as on any other make.^[1][2]

Can I keep driving with P0299?

Garage soon. You can normally get to the garage by driving gently, often in degraded mode, but you should not carry on using the car as normal: the fault can end up causing more serious engine damage.^[1][2]

Sources

Every fact on this page links to its source. If you find an error, let us know.

Qué significa el código P0299Autodoc Club · Technical documentation · consulted 2 October 2026 · in Spanish
P0299: Turbocharger/Supercharger A Underboost ConditionCarista · Technical documentation · consulted 2 October 2026