P0299 on Citroen: How to Diagnose & Fix
Turbo/Supercharger Underboost Condition
2 Citroen models · 2 documented issues · 2 critical · $400-$2,600 repair
P0299 on Citroen by model: symptoms, diagnosis and fix
The DS3 THP turbocharger develops oil leaks from the oil feed and return pipes, and the turbo bearing seals degrade over time. Oil consumption increases and blue smoke is visible under boost and on the overrun.
Common Symptoms
- Blue smoke under boost
- Increased oil consumption
- Oil around turbo
- Turbo whistle change
How to Fix
Replace turbo oil feed and return lines with updated gaskets. Rebuild or replace the turbocharger if shaft play is detected. Maintain strict oil change intervals.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- NTY ECD/CT/002A turbocharger oil-feed pipe with banjo hardware
replace a confirmed leaking or disturbed OE 037956 pressurized turbo oil-feed line Fitment/availability: Citroen DS3 1.6 THP 155 2010-2015, DS3 Racing 2011-2015 and listed convertible branches; OE 0379.56/037956/9824001880, includes banj…
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Sources for this issue (1)
The DV6 1.6 HDi diesel is notorious for turbocharger oil starvation: carbon sludge blocks the integral strainer in the turbo oil-feed banjo bolt and the feed pipe itself, starving the turbo bearings of oil. The recessed sump plug leaves roughly 400-500 ml of contaminated oil behind at every oil change, which accelerates sludge build-up, and failures are reported from as little as 30,000 miles where service intervals were stretched. Debris from a failed turbo recirculates through the oil system and will quickly destroy a replacement turbo unless the entire lubrication circuit is cleaned.
Common Symptoms
- Loud whining or whistling from the turbo
- Loss of power, especially under load
- Blue/grey exhaust smoke
- STOP light with low oil pressure warning
- Sudden increase in oil consumption
How to Fix
Fit a new or reconditioned turbo together with new oil feed/return pipes and banjo bolts, drop the sump to clean or replace the oil pickup strainer, flush the engine and fit a new filter. Thereafter shorten oil-change intervals (10,000 km or less with the correct low-SAPS oil) and consider the known oil-feed modification to protect the new turbo.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- TPUK DV6 110 PS GT1544V turbo fitting and lubrication kit
replace the contaminated lubrication hardware required during a correctly diagnosed turbo repair Fitment/availability: Citroen/PSA DV6 1.6 HDi 110 PS using Garrett GT1544V / 753420 branch; includes oil pump, OE oil filter, feed pipe, pic…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (5)
- 1.6 Hdi / DV4 / DV6 turbo feed modification (banjo bolt strainer blockage, Citroen C4 discussed) - French Car Forumforum
- Citroen C4 1.6HDI - STOP low oil pressure light - RMS Motoring Forumforum
- 1.6 HDI Turbocharger Fitting Guide (oil starvation, carbon sludge, banjo gauze filter) - London Turbosarticle
- Tackling Turbo Trouble - PSA 1.6 HDI Engine - Professional Motor Mechanicarticle
- PSA 1.6 HDi Turbocharger Technical Fitting Bulletin (Turbopacs/BTN aftermarket bulletin)tsb
P0299 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0299 mean on a Citroen?
P0299 stands for "Turbo/Supercharger Underboost Condition." P0299 means the engine computer detected an underboost condition — the turbocharger or supercharger is producing less boost pressure than the PCM expects for the given conditions. The computer compares the manifold/boost pressure sensor reading to a target based on engine load, and when actual boost falls short, it sets this code. The most common real-world cause is a leak somewhere in the intake/charge-air path. You'll typically feel reduced power or sluggish acceleration, and the engine may go into a reduced-power mode. On Citroen it is documented across 2 models: DS3, C4.
What are the most common causes of P0299?
The most common causes of P0299 are: Boost/intake leak (cracked or loose charge-air hose or intercooler), Faulty or sticking turbo wastegate or actuator, Stuck or clogged variable-geometry turbo vanes (VGT), Faulty boost pressure or MAP sensor, Leaking or disconnected vacuum/boost control lines, Restricted air intake or clogged air filter, Failed boost control solenoid, Worn or failing turbocharger. The specific cause varies by vehicle.
How much does it cost to fix P0299 on a Citroen?
Published repair estimates on Citroen range from $400 to $2,600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0299 on a different make?
View P0299 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.