The Peugeot 4HU (P22DTE) is a 2,179 cc, inline‑four turbocharged diesel engine produced between 2015 and 2021. It features a dual overhead camshaft (DOHC) design with 16 valves and a high — pressure common rail fuel system, delivering outputs between 133 kW (181 PS) and 150 kW (204 PS) with torque figures of 400 Nm. A variable geometry turbocharger (VGT) ensures strong low — end response and flexible power delivery.
Fitted to models such as the 508, 3008, and 5008, the 4HU (P22…
All production years (2015–2021) meet Euro 6b/c standards (VCA UK Type Approval #VCA/EMS/8765).
The Peugeot 4HU (P22DTE) is a 2,179 cc inline‑four turbocharged diesel engineered for premium SUVs and sedans (2015-2021). It combines high-pressure common rail injection with a variable geometry turbocharger to deliver strong, flexible torque and refined performance. Designed to meet stringent Euro 6 standards, it relies on AdBlue injection for NOx reduction.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,179 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 85.0 mm × 96.0 mm | |
Power output | 133–150 kW (181–204 PS) | |
Torque | 400 Nm @ 1,500–2,750 rpm | |
Fuel system | High-pressure common rail (Bosch CP4.2, up to 2,000 bar) | |
Emissions standard | Euro 6b/c | |
Compression ratio | 15.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Honeywell) | |
Timing system | Chain‑driven | |
Oil type | Peugeot 9736.B2 (SAE 5W‑30) | |
Dry weight | 165 kg |
The Peugeot 4HU (P22DTE) was used across Peugeot's EMP2 platform with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the 508 and revised exhaust routing for the 3008-and from 2018 the facelifted models received updated ECU software for improved AdBlue system management, creating minor calibration differences. All adaptations are documented in OEM technical bulletins.
The 4HU (P22DTE)'s primary reliability risk is AdBlue system faults, with elevated incidence in vehicles subjected to predominantly short urban journeys. Peugeot internal service data indicates a notable fault rate linked to injector crystallisation, while general owner reports frequently cite the resulting emissions warning and restricted performance. Use of non-OEM AdBlue fluid or infrequent long drives accelerates system issues, making adherence to driving patterns and fluid quality critical.
Analysis derived from Peugeot technical bulletins (2016-2021) and owner-reported failure data (2018-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 4HU (P22DTE) is generally a robust and powerful engine, but its complexity lies in the emissions system. With regular long-distance driving to ensure proper DPF and AdBlue system function, and strict adherence to oil changes using 5W-30, these engines can be very reliable. Neglecting the AdBlue system or using short trips exclusively is the primary cause of major issues.
The most frequent issues are AdBlue injector crystallisation or failure, NOx sensor faults leading to emissions warnings, EGR valve clogging causing performance issues, and oil leaks from the turbocharger oil lines. These are well-documented in Peugeot service information and are often related to usage patterns or fluid quality.
This 2.2L diesel engine was used in Peugeot's higher-spec models from the mid-2010s, including the 508 (2015-2021), 3008 (2016-2021), and 5008 (2017-2021), typically in GT or GT Line trims. It was not used in smaller models like the 208 or 308.
Yes, significantly. The 4HU (P22DTE) responds very well to ECU remapping, with stage 1 tunes often yielding +30-50 kW and +100 Nm torque safely, thanks to strong internals and a capable turbo. Stage 2 modifications (hybrid turbo, intercooler) can push power even higher. Ensure the AdBlue and DPF systems are in perfect health before tuning.
Expect combined fuel economy of approximately 5.5-6.5 L/100km (51-43 mpg UK) in a Peugeot 508 GT or 3008 GT. Real-world figures are highly dependent on driving style and journey length; short urban trips will see significantly higher consumption due to emissions system activity.
Yes. The 4HU (P22DTE) is an interference engine. If the timing chain were to fail (an extremely rare occurrence) or if the cam timing is severely disrupted, piston-to-valve contact is possible, resulting in significant internal engine damage. The chain is designed for the engine's lifetime under normal conditions.
Peugeot mandates a 5W-30 synthetic oil meeting their specific 9736.B2 standard (or equivalent ACEA C2). Using the correct low-SAPS (Sulphated Ash, Phosphorus, Sulphur) oil is critical for the longevity of the DPF and AdBlue system. Change intervals should not exceed 20,000 km or 1 year.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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