The cheapest factory-LPG crossover in Europe. The ECO-G system is integrated on the production line, not an aftermarket conversion, and offers genuine fuel savings of around 30% over petrol. The H4Dt 3-cylinder turbo engine is shared across Dacia and Renault models and is fundamentally robust, but the LPG system adds specific maintenance items and potential failure points that the petrol-only Duster does not have. Dacia designed the engine for bi-fuel use from the outset, including adapted valve seats and ignition mapping.
Very low fuel costs on LPG
Simple, proven engine platform
LPG system adds failure points
Turbo sensitive to LPG operation
Buy if: You want the cheapest SUV running costs in Europe and have reliable LPG station access along your regular routes.
Avoid if: You only do short trips under 10 km (LPG system needs warm-up) or there are few LPG stations in your area.
Expected Annual Maintenance Costs
Common Problems
LPG combustion runs hotter, accelerating turbo wear and causing wastegate failure or oil leaks · more· less
The 1.0 TCe turbocharger is the most frequently reported failure on the ECO-G variant. LPG combustion produces higher exhaust gas temperatures than petrol, placing additional thermal stress on the turbo. Many workshops have described this as a pattern defect, with some owners experiencing turbo failure as early as 30,000 km. Symptoms include metallic whistling that increases with revs, blue exhaust smoke after acceleration, P0299 fault codes (insufficient boost), and loss of thrust between 2,000-3,500 rpm. Dacia has released ECU software updates that adjust boost mapping to reduce thermal stress. A wastegate repair or cleaning costs 120-350 euros if caught early. Full turbo replacement runs 700-1,400 euros. Regular oil changes with 5W-30 every 15,000 km (rather than the extended interval) are critical for turbo longevity on LPG.
Worn injector coils or tips cause cylinders to drop off LPG, forcing petrol switching · more· less
The factory ECO-G system uses dedicated LPG injectors with electromagnetic coils. Over time, these coils and their tip seals degrade, particularly if LPG filters are not replaced on schedule. When an injector fails, the affected cylinder stops receiving LPG and the system forces a switch back to petrol with a dashboard warning. A gas smell in the engine bay or rear is a telltale sign of a rail or seal leak. Replacing all LPG injectors (recommended to do the full set) costs 200-450 euros including calibration. Keeping LPG filters fresh (gas phase every 18,000 km, liquid phase every 36,000 km) significantly reduces this risk.
Reducer pressure becomes unstable at operating temperature, causing lean/rich mixture and rough running on LPG · more· less
The LPG reducer converts liquid LPG to gas before injection. Internal diaphragms and pressure regulators degrade over time, especially under sustained high-temperature operation. Symptoms include rough running, hesitation under acceleration, and P0171/P0172 fault codes (lean/rich mixture) only when running on LPG. The car typically switches to petrol without issue. Some owners have had the reducer replaced under warranty after it was found leaking gas into the inlet manifold. Reducer overhaul or replacement costs 150-300 euros at an LPG specialist. More common after 60,000-80,000 km and in cars driven primarily on LPG with infrequent petrol use.
Chain stretches and tensioner weakens, typically between 100,000-150,000 km · more· less
The H4Dt uses a thin timing chain designed for 100,000-150,000 km service life. The oil jet lubricating the chain can clog from soot, especially if oil changes are delayed. LPG operation may contribute slightly due to different combustion byproducts. Symptoms include a cold-start rattle lasting several seconds. If the chain skips, catastrophic valve-to-piston contact occurs. Replacement involves the chain, guides, tensioner, and sprockets. The engine has no hydraulic lifters, requiring manual valve clearance adjustment every 60,000 km. Using quality 5W-30 oil and changing it at 15,000 km intervals helps preserve chain life. Independent shop cost: 800-1,000 euros; dealer: up to 1,500 euros.
System fails to switch from petrol to LPG in cold weather, staying on petrol indefinitely · more· less
The ECO-G system requires the engine to reach operating temperature before switching from petrol to LPG. In cold weather (below 10 degrees Celsius), some owners report the system failing to switch at all, remaining on petrol for the entire journey. After several unsuccessful switching attempts, the system locks to petrol mode until the engine is fully stopped and restarted. A faulty MAP sensor has been identified as one cause, with replacement costing around 100-200 euros. In other cases, a software recalibration at the dealer resolves the issue. This is more of an annoyance than a safety concern, as the car drives normally on petrol.
Shock mounts, drop links, and anti-roll bar bushes wear quickly due to budget suspension tuning · more· less
The Duster's suspension is tuned for off-road capability with generous wheel travel, but this accelerates wear of upper shock absorber mounts, anti-roll bar drop links, and silent blocks. Knocking over potholes and creaking at low-speed turns can appear as early as 15,000-20,000 km. Parts are inexpensive (drop links 15-30 euros per pair, top mounts 30-50 euros each, bushes 5-15 euros), keeping repair costs at 200-450 euros including labor. Budget for replacement every 40,000-60,000 km on rough roads.
Water enters the boot through tailgate wiring grommet, keyhole area, or boot seal · more· less
A well-documented Duster Mk2 issue where water enters the boot area through the wiring loom grommet, rear keyhole area, or a poorly fitted boot seal. Water pools under the boot floor, potentially damaging the LPG components and wiring located there. The LPG tank sits under the boot floor in place of the spare wheel, making water ingress particularly problematic on the ECO-G variant. Dacia has addressed this under warranty on many cars. Resealing costs 50-100 euros; if corrosion has started, up to 200 euros.
Media Nav unit freezes, goes blank, or reboots randomly during use · more· less
The Media Nav infotainment system in the Duster can freeze on the boot logo, experience random reboots, or have an unresponsive touchscreen. Early Mk2 models (2020) are more affected than 2022+ facelift cars with the updated 8-inch unit. A factory data reset may resolve the issue. If the internal NAND memory fails, specialist repair costs 150-250 euros or replacement 300-400 euros. This does not affect driveability but is a persistent annoyance on affected models.
Budget-friendly but the LPG system demands attention
The Duster ECO-G is mechanically the same proven Dacia underneath, but the LPG system introduces failure points that the petrol-only version does not have. The turbocharger is the most concerning component, running hotter on LPG and failing earlier than on petrol models. LPG filter services must not be skipped. Suspension wears fast but is cheap to fix. Most issues are well-documented and can be caught during a thorough pre-purchase inspection. Regular oil changes at 15,000 km intervals with quality 5W-30 oil and keeping LPG filters fresh are the best preventive measures.
Recalls and Technical Service Bulletins
LPG tank welding defect - risk of gas release into passenger compartment (July 2022 production)
Critical - verify completed
Ignition switch may jam in start position (Sep 2017 - Oct 2018 production)
Verify completed
Left curtain airbag deployment issue (Jul 2022 production)
Verify completed
Fuse box terminal connection arcing risk (Feb 2017 - May 2017 production)
Verify completed
Electronic connector R107 not properly secured (2023-2024 production)
Verify completed
ABS/ESP cable chafing risk (2024 production)
Verify completed
Contact a Dacia dealer with the VIN to verify all recalls have been completed. The LPG tank welding recall is critical for ECO-G models as it involves a fire risk. The ignition switch recall applies to early Mk2 production cars.
Warranty Status
Factory warranty (3 years / 100,000 km)
Expired on 2020-2022 models
LPG system warranty
Same as factory warranty (3 years / 100,000 km)
Rust perforation warranty (6 years)
May still apply on 2020+ cars
LPG tank certification
Valid for 10 years from manufacture date
Dacia offers 3 years / 100,000 km factory warranty in Europe, covering the LPG system equally. Cars from 2020-2022 are now outside warranty. The LPG tank has a separate 10-year certification period, after which it must be re-inspected or replaced. Verify remaining warranty status with a Dacia dealer using the VIN.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.