Renault P0299

Turbo underboost on Renault — 1.5 dCi K9K and 1.6 dCi R9M commonly suffer turbo oil starvation and actuator failure.

Renault P0299 — Turbo underboost on Renault — 1.5 dCi K9K and 1.6 dCi R9M commonly suffer turbo oil starvation and actuator failure. Typical UK independent garage cost: £250–£1800.

What actually causes P0299 on a Renault

Renault 1.5 dCi K9K is notorious for turbo failures caused by oil feed pipe blockage and short-trip use — the turbo bearings cook, then the VGT sticks. Always replace the oil feed pipe (£30–£50 part) when fitting any new or rebuilt turbo on these engines or it will fail again within 12 months.

Renault engines that log P0299

• 1.5 dCi K9K (Clio, Megane, Captur, Kadjar)
• 1.6 dCi R9M (Megane, Scenic, Kadjar)
• 1.2 TCe (Clio, Captur)

How we diagnose P0299 on a Renault

1. Inspect oil feed pipe for restriction (cut it open if removed — common to find solid carbon)
2. Smoke-test boost system
3. Test VGT actuator sweep
4. Reduce oil change interval to 7,500 miles for UK short-trip use

The common misdiagnosis to avoid

Never fit a replacement turbo on K9K / R9M without also replacing the oil feed pipe — Renault dealers and indies both make this mistake regularly.

Renault P0299 repair cost in the UK

Expect £250–£1800 including parts and labour at an independent garage. Main-dealer quotes on Renault are usually higher for the same job, and the spread exists because the cheap cause and the expensive cause throw the same code — pay for the diagnosis before you pay for parts.

Bob's workshop tip

On any Renault 1.5 dCi with P0299 plus more than 100,000 miles, plan for the full turbo + oil feed pipe + oil change package — about £900–£1,400 at a Renault specialist. Half-measures fail.

Codes usually seen alongside P0299 on Renault

• P132B
• P0234

Symptoms drivers report with P0299

• Loss of power above 2,000–2,500 RPM — car feels flat overtaking on the motorway
• Limp mode kicks in at 3,000 RPM, resets after a key cycle, then returns within 10 miles
• Whistling from engine bay under load — split intercooler pipe or Y-piece
• Black smoke or fuel smell from the exhaust on diesels — VNT stuck open, over-fuelling
• Paired codes: P0234 (overboost, VNT stuck closed), P0299 with P0401 (EGR + boost overlap), P0299 with P132B (turbo boost control)

Repairs that clear P0299

• Smoke-test the boost system first (cheap and finds most causes)
• Clean VNT vanes with rocker-arm actuation
• Replace boost sensor
• Replace turbo as last resort

For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0299 guide.

Reading P0299 on a Renault properly

A generic reader will show P0299 and nothing else. What matters is the freeze-frame data stored with it — engine speed, load, coolant temperature and fuel trims at the moment the fault was logged — plus whether any other module on the Renault has logged something at the same time. Codes rarely arrive alone, and the order they were stored in usually points at which one is the cause and which are the consequences.

Clearing P0299 without fixing it

Erasing the code resets the Renault's readiness monitors as well as the light. The fault returns on the next drive cycle if the cause is still there, and in the meantime the incomplete monitors can stop the car passing an emissions check. After a genuine repair, the car is driven until the relevant monitor completes before it is handed back.

Bob's Mechanical Repairs is an independent garage in Birnam, Dunkeld, Perthshire, with 32 years of Bob's experience on the tools. If P0299 is showing on your Renault, bring any scan results with you — we will read the live data ourselves, confirm which cause it actually is, and price the repair before any work starts.