PSA PureTech / HN09 — engine review
1.2 PureTech HN09 (136 hp) Hybrid: Experiences, issues, fuel consumption and used‑car buying tips
Key points (TL;DR)
- Finally a timing chain: Unlike the older 1.2 PureTech engines, this Hybrid generation (HN09) uses a timing chain instead of the problematic belt running in oil.
- Hybrid system: Paired exclusively with the e-DCS6 dual‑clutch gearbox which has an integrated electric motor (48V Mild Hybrid).
- City fuel consumption: Noticeably lower thanks to the hybrid system; the electric motor assists when setting off.
- Performance: In the Peugeot 3008 it performs quite well, while in the larger Peugeot 5008 it can feel slightly underpowered on long, steep climbs.
- Gearbox maintenance: Changing the oil in the e-DCS6 gearbox is an absolute priority for longevity.
- No AdBlue: Since it’s a petrol engine, you avoid the headaches with NOx reduction systems typical for diesels, but it does have a GPF filter.
Contents
- Introduction and basic information
- Technical specifications
- Reliability and maintenance
- Specific parts and costs
- Fuel consumption and performance
- Additional options and modifications
- Gearbox and drivetrain
- Buying used and conclusion
Introduction and basic information
When someone mentions “1.2 PureTech” in mechanic circles, the first association is often a snapped timing belt bathing in oil and a clogged oil pump strainer. However, the engine designated HN09, which produces 136 hp (100 kW) and comes in a 48V Mild Hybrid version, represents a major turning point for the Stellantis group. It is fitted mainly to heavier vehicles such as the Peugeot 3008 and 5008 (phase II, from 2020 onwards, with wider use in newer model years). This engine has been thoroughly redesigned, runs on the so‑called Miller cycle and is engineered to correct all the flaws of its predecessor, primarily by replacing the belt with a chain.
Technical specifications
| Feature | Data |
|---|---|
| Displacement | 1199 cc |
| Power | 100 kW (136 hp) at 5500 rpm |
| Torque | 230 Nm at 1750 rpm |
| Engine codes | HN09 / EB2 Gen3 |
| Injection type | Direct injection |
| Aspiration | Turbocharger (VGT) + intercooler |
Reliability and maintenance
Timing belt or chain?
This is the most important news for all potential buyers: the HN09 engine uses a timing chain, not a belt running in oil. Stellantis has finally acknowledged the problem and for this generation (the so‑called EB2 Gen3) switched to a more robust solution. This eliminates the biggest fear of French petrol‑engine owners.
Most common issues
Since this is a relatively new architecture, long‑term issues are still being mapped. However, from real‑world experience we can highlight:
- Carbon buildup on intake valves: Due to direct injection, fuel does not wash the valves. After 80,000 to 100,000 km carbon deposits can form, causing rough idle.
- Hybrid system software bugs: Occasional jerks when transitioning from electric to petrol drive are usually resolved by updating the engine control unit (ECU) software.
Major and minor service
Since it has a chain, a classic “major service” in the sense of belt replacement is not performed. Still, it is recommended to check the condition of the chain, tensioner and guides at around 150,000 km. If you hear rattling on a cold start, the chain kit should be replaced. As for minor services, the engine takes about 3.5 to 3.8 litres of oil. Only low‑viscosity fully synthetic 0W-20 oil is recommended (meeting the specific Stellantis standards for hybrids). Change the oil every 10,000 to a maximum of 15,000 km, never at the factory‑stated 30,000 km interval.
Oil consumption and spark plugs
Three‑cylinder engines of this design can consume a bit of oil. Up to 0.4–0.5 litres per 10,000 km is considered normal. If it uses more than that, the problem may lie in the piston rings or the turbocharger itself. The spark plugs are exposed to high temperatures and pressure, so they should be replaced every 40,000 to 60,000 km to protect the ignition coils and prevent misfires.
Specific parts and costs
Flywheel and clutch
This model does not have a conventional manual gearbox, but only the automated e-DCS6. It does not use a traditional dual‑mass flywheel as seen on diesels, but a specific dual‑clutch assembly with an integrated 21 kW electric motor. If this module fails, repairs are very expensive (depends on market), as it requires work by a specialist hybrid transmission workshop.
Injection system and turbocharger
The direct injection system operates at very high pressure. The injectors are generally not problematic, but are extremely sensitive to poor‑quality fuel. It is advisable to occasionally fill up with premium petrol containing additives. The engine uses a VGT turbocharger (variable geometry), which is rare for small petrol engines and serves to eliminate turbo lag. The turbo’s service life is over 200,000 km if the oil is changed regularly and the engine is not switched off immediately after hard motorway driving.
Eco systems: DPF, EGR and AdBlue?
Since this is a petrol engine, it does not have an AdBlue system, so you are spared issues with urea pumps and tanks. It also does not have a classic diesel DPF, but it does have a GPF (Gasoline Particulate Filter) and an EGR valve. The GPF regenerates much more easily than a diesel DPF because petrol exhaust temperatures are higher, so it rarely clogs, unless the car is driven exclusively on very short trips of 2–3 kilometres in winter.
Fuel consumption and performance
City driving
In stop‑and‑go city traffic, the 48V hybrid system really shines. The electric motor can move the car on its own at low speeds and when parking. Real‑world city consumption for a heavier car like the Peugeot 3008 is between 6.5 and 7.5 l/100 km, which is an excellent result for a petrol engine of this size.
Is the engine “lazy”?
Thanks to the electric boost that provides instant throttle response, the 3008 does not feel sluggish in everyday driving. However, in the larger Peugeot 5008, when loaded with family and luggage, on long uphill stretches and when overtaking you will feel that there is only a 1.2‑litre engine under the bonnet. Physics cannot be completely cheated.
Behaviour on the motorway
On open roads the engine is quiet and refined. At a cruising speed of 130 km/h, the gearbox keeps it at around 2600–2800 rpm. The hybrid system doesn’t help much on the motorway, so due to the SUV body shape and aerodynamic drag, fuel consumption at this speed rises to 7.5 to 8.5 l/100 km.
Additional options and modifications
LPG conversion
The combination of direct petrol injection and a complex hybrid system means only one thing: LPG conversion is absolutely not recommended. The installation would be very expensive (depends on market), it would still require petrol injection to cool the injectors, and software integration with the 48V MHEV system is a nightmare for LPG installers.
Remapping (Stage 1)
Although the petrol engine itself has some potential for a mild power increase to around 150–155 hp, remapping this model is very risky. The issue is not the engine block itself, but the e-DCS6 gearbox and hybrid controller, which have strictly limited torque tolerances. A remap can quickly destroy the clutch packs in the gearbox and confuse the hybrid ECU.
Gearbox and drivetrain
As already mentioned, this model does not come with a manual gearbox or with the old Japanese EAT8 automatic. The heart of the drivetrain is the e-DCS6 automatic (Punch Powertrain) with dual wet clutches and an integrated electric motor and inverter. The most common issues include harsher shifts from first to second when cold, which are resolved by software calibration. Due to the wet‑clutch design, regular gearbox oil changes are critical. The gearbox should be serviced every 60,000 km to flush out deposits and protect the mechatronics.
Buying used and conclusion
What to check before buying?
- Hybrid diagnostics: It is MANDATORY to read fault codes specific to the 48V battery and the electric motor in the gearbox.
- Noise on startup: Even though it has a chain, start it completely cold. You should not hear metallic rattling for more than 1–2 seconds while the oil pump builds pressure.
- Test drive: Pay attention to braking behaviour. Hybrids regenerate energy, so the transition from regenerative to mechanical braking should not be felt as a jolt or a sinking brake pedal.
- Service history: Insist on proof that the oil has been changed more frequently than the factory interval.
- Gearbox service: Check whether the e-DCS6 gearbox oil has been changed at least once by 60,000 km.
Who is this engine for?
The Peugeot 3008 and 5008 with the 1.2 PureTech HN09 (136 hp) Hybrid engine are an excellent choice for family drivers covering around 15,000 km per year, mainly in the city and suburbs, with a couple of longer trips annually. By switching to a timing chain and introducing 48V hybridisation, Stellantis has made a generational leap, correcting the fatal flaws of the old PureTech engines. If you are looking for a modern petrol engine in a nicely designed SUV and you are not an aggressive driver who needs thunder under the bonnet, this model is worth considering, provided you thoroughly check the condition of the gearbox before buying.
