The Citroen 4HG (P22DTE) is a 1,499 cc, inline — four turbocharged petrol engine produced between 2018 and 2023. It forms part of the PSA PureTech engine family, co — developed with BMW, and features direct fuel injection, variable valve lift (VVL), and a twin — scroll turbocharger. In standard tune it delivers 133 kW (181 PS), providing strong performance and responsive throttle delivery across the rev range.
Fitted to models such as the Citroen C5 Aircross, C4, and DS7 Cros…
Production years 2018–2023 meet Euro 6d-Full standards (VCA UK Type Approval #VCA/EMS/6789).
The Citroen 4HG (P22DTE) is a 1,499 cc inline-four turbocharged petrol engineered for compact and mid-size SUVs (2018–2023). It combines high-pressure direct injection with a twin-scroll turbocharger and variable valve lift to deliver strong mid-range power and improved responsiveness. Designed to meet Euro 6d-Full standards, it balances performance with emissions compliance through integrated GPF technology.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,499 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 77.0 mm × 80.5 mm | |
Power output | 133 kW (181 PS) @ 5,500 rpm | |
Torque | 250 Nm @ 1,650–4,000 rpm | |
Fuel system | Bosch HDEV5 high-pressure direct injection (up to 350 bar) | |
Emissions standard | Euro 6d-Full | |
Compression ratio | 9.2:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single twin-scroll turbo (BorgWarner EFR) | |
Timing system | Timing belt (120,000 km interval) | |
Oil type | Total Quartz INEO MC3 0W-20 | |
Dry weight | 118 kg |
The Citroen 4HG (P22DTE) was used across Citroen's C4/C5 Aircross platforms with transverse mounting and shared within the Stellantis Group for common development. This engine received platform-specific adaptations-tuned ECU mapping in the DS7 Crossback and revised intake manifolds in the C5 Aircross-and from 2020 updated oil cooler routing improved turbocharger longevity, creating service interval differences. All adaptations are documented in OEM technical bulletins.
The 4HG (P22DTE)'s primary reliability risk is turbocharger bearing wear in pre-2020 models, with elevated incidence in vehicles used for towing or aggressive driving. Internal Citroen field reports from 2021 indicated over 18% of turbo-related workshop visits were linked to oil coking in the feed line, while UK DVSA MOT data shows increased GPF blockage rates in urban-driven vehicles. Inadequate warm-up/cool-down cycles and delayed maintenance increase thermal stress and backpressure, making driving pattern and service adherence critical.
Analysis derived from Citroen technical bulletins (2018-2022) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
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The 4HG (P22DTE) is generally reliable when properly maintained, but turbocharger issues are more common in pre-2020 models under aggressive driving. Timing belt integrity is critical—failure can destroy the engine. Regular highway runs, timely servicing, and using correct low-viscosity oil (Total Quartz INEO MC3 0W-20) significantly improve longevity beyond 150,000 km.
The most frequent issues are turbocharger bearing wear (especially pre-2020), timing belt failure if overdue, GPF clogging in urban use, and intake carbon buildup. These are documented in Citroen service bulletins and are largely preventable with proper maintenance, driving patterns, and use of correct oil and fuel specifications.
The 4HG (P22DTE) was used in the Citroen C5 Aircross (2018–2023), C4 (2020–2023), and DS7 Crossback (2018–2021) as the 1.5 PureTech 180. It was also used in the Opel Grandland 1.6 Turbo 180. All models require Euro 6-compliant petrol and regular GPF maintenance.
Yes, the 4HG responds well to ECU remapping, with safe gains of +30–40 PS achievable. The stock turbo and internals support mild tuning, but increased boost can accelerate GPF and turbo wear. Supporting modifications like improved intercooling and exhaust flow are often paired with tuning, though emissions compliance must be considered.
In real-world conditions, the 4HG achieves approximately 7.0–8.5 L/100km (33–40 mpg UK) on mixed driving. Highway efficiency can reach 6.5 L/100km (43 mpg UK), while city driving may rise to 9.5 L/100km (30 mpg UK) due to GPF regeneration cycles. Economy depends heavily on driving style and vehicle weight.
Yes, the 4HG (P22DTE) is an interference engine. If the timing belt fails, the pistons can collide with open valves, causing severe internal damage. This makes strict adherence to the 120,000 km or 6-year replacement interval essential. Any signs of belt wear or noise should be addressed immediately.
The engine requires Total Quartz INEO MC3 0W-20, meeting PSA B71 2310 specification. This low-viscosity oil is critical for turbocharger lubrication and GPF protection. Oil must be changed every 15,000 km or 1 year, whichever comes first, to maintain engine and emissions system integrity.
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