Nissan P0299

Turbo underboost on Nissan — 1.5 dCi (shared with Renault) suffers turbo oil starvation. 1.6 dCi has known turbo failures.

Nissan P0299 — Turbo underboost on Nissan — 1.5 dCi (shared with Renault) suffers turbo oil starvation. 1.6 dCi has known turbo failures. Typical UK independent garage cost: £400–£1800.

What actually causes P0299 on a Nissan

The 1.5 dCi turbo (shared with Renault) is starved of oil by a known issue with the banjo bolt strainer clogging up — turbo bearing wear follows and you get P0299 with limp mode. Always replace the turbo oil feed pipe AND fit a new banjo bolt strainer with any turbo work on these.

Nissan engines that log P0299

• 1.5 dCi (Note, Juke, Qashqai, Micra)
• 1.6 dCi (Qashqai, X-Trail)
• 1.2 DiG-T (Juke, Pulsar, Qashqai)

How we diagnose P0299 on a Nissan

1. Smoke-test boost system from turbo outlet to intake
2. Check for any oil leak around turbo (bearing seal failure indicator)
3. Inspect oil feed pipe condition — replace with new
4. Confirm engine oil change schedule has been kept (5,000 mile max on these)

The common misdiagnosis to avoid

Fitting a new turbo to a 1.5 dCi without replacing the oil feed pipe and strainer = new turbo destroyed inside 30,000 miles. The strainer is £15. Always fit it.

Nissan P0299 repair cost in the UK

Expect £400–£1800 including parts and labour at an independent garage. Main-dealer quotes on Nissan 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

Used 1.5 dCi turbos are abundant cheap but rarely worth fitting — the failure rate of secondhand units is sky-high. Pay £350–£500 for a quality remanufactured unit with new core.

Codes usually seen alongside P0299 on Nissan

• P0234
• P2263
• P132B

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 Nissan 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 Nissan 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 Nissan'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 Nissan, 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.