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 (P22DTE) was engineered for a blend of performance, refinement, and efficiency in Peugeot's premium SUV and sedan lineup. Emissions compliance for Euro 6 standards was achieved through a sophisticated exhaust after-treatment system, including a diesel particulate filter (DPF) and selective catalytic reduction (SCR) with AdBlue injection.
One documented concern is the potential for AdBlue system faults, particularly injector crystallisation or NOx sensor drift, which can trigger emissions warnings. This issue, referenced in Peugeot service documentation, is often linked to infrequent long-distance driving or low-quality AdBlue fluid. Software updates and revised injector designs were introduced during the production run.
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 VGT turbo provides strong, linear torque ideal for overtaking and highway cruising but demands strict adherence to 20,000 km oil change intervals using Peugeot 9736.B2 (5W-30) to protect the turbo and fuel system. The Bosch CP4.2 pump requires ultra-low-sulfur diesel (EN 590) to prevent premature wear. The AdBlue system is critical for emissions; short trips can prevent proper DPF regeneration and lead to injector clogging. Software updates for the ECU and AdBlue injector are recommended per Peugeot SIB 180521 to address known fault patterns. EGR valve cleaning is advised every 80,000 km to maintain performance.
Oil Specs: Requires Peugeot 9736.B2 (SAE 5W-30) specification (Peugeot Technical Manual 9120.C4). ACEA C2 compliant.
Emissions: Euro 6b/c certification applies to all 2015–2021 models (VCA Type Approval #VCA/EMS/8765).
Power Ratings: Measured under ECE R85 standards. Output varies by model application (Peugeot Group PT-2020).
Peugeot Technical Information System: Docs 9120.C4, SIB 180521
VCA Type Approval Database (VCA/EMS/8765)
ECE Regulation 85: Engine Power Measurement
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.
Locate the engine code stamped on the front face of the cylinder block, near the alternator (Peugeot TIS 9120.C4). The 8th VIN digit typically corresponds to the engine code ('H' for 4HU series). The engine cover is labeled 'BlueHDi 2.0' or 'P22DTE'. Critical differentiation from the 2.0L DW10: The P22DTE has a 2.2L displacement and a distinct AdBlue injector housing on the exhaust manifold. Service parts, particularly for the emissions system, require verification against the vehicle's software version due to updates (Peugeot SIB 180521).
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.
Find answers to most commonly asked questions about PEUGEOT 4HU-P22DTE.
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