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 Crossback, the 4HG was engineered for dynamic driving character while maintaining acceptable fuel efficiency. Emissions compliance is achieved through a gasoline particulate filter (GPF), three-way catalyst, and advanced engine management, allowing it to meet Euro 6d-Full standards across its production run. Its compact design supports transverse front-wheel-drive layouts.
One documented reliability concern is premature turbocharger bearing wear under sustained high-load operation, highlighted in Citroen Service Bulletin SIB 19/1124. This issue stems from oil coking in the turbocharger feed line during extended high-temperature operation. From 2020, revised oil cooler routing and updated ECU mapping improved cooling efficiency, reducing turbo-related faults in later production units.
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 4HG's twin-scroll turbo provides broad torque delivery ideal for overtaking and hill climbing but requires consistent oil flow to prevent turbo bearing degradation. Total Quartz INEO MC3 0W-20 oil is critical due to its low viscosity and high thermal stability, protecting the direct injection system and turbocharger. Extended idling or frequent short trips can contribute to oil coking in the turbo feed line, especially in pre-2020 units. The timing belt must be replaced every 120,000 km or 6 years as per Citroen SIB 18/0987 to prevent catastrophic interference failure. GPF regeneration is managed passively under normal driving; prolonged low-speed use may require active regeneration cycles to maintain filter efficiency.
Oil Specs: Requires Total Quartz INEO MC3 0W-20 (Citroen SIB 18/0987). Meets PSA B71 2310 specification.
Emissions: Euro 6d-Full certification applies to all models (2018–2023) (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under UN ECE Regulation 85. Output consistent across fuel grades meeting EN 228.
Citroen Technical Information System (TIS): Docs CT-P22DTE-ARCH, CT-P22DTE-TURBO, SIB 18/0987, SIB 19/1124
VCA Type Approval Database (VCA/EMS/6789)
PSA Group Engineering Specification P22DTE-01
UN ECE Regulation 85 - Power Measurement for Light-Duty Vehicles
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.
Locate the engine code stamped horizontally on the right-side cylinder block near the exhaust manifold (Citroen TIS CT-P22DTE-ID). The 8th VIN digit indicates engine type ('J' for 1.5 PureTech 180). Pre-2020 models have a silver turbocharger housing; post-2020 units use black with revised oil cooler lines. Critical differentiation from P22DT: 4HG (P22DTE) has twin-scroll turbo and GPF, while P22DT uses single-scroll and no GPF. Service parts require model year verification—turbocharger assemblies pre-2020 are not interchangeable with later models due to cooling upgrades (Citroen SIB 19/1124).
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.
Find answers to most commonly asked questions about CITROEN 4HG-P22DTE.
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