The Citroën RHZ, known internally as DW10ATED4, is a 1,997 cc, inline-four turbocharged diesel engine produced between 2015 and 2020. It features a DOHC 16-valve configuration, high-pressure common-rail direct injection (up to 1,800 bar), and a variable geometry turbocharger (VGT) with integrated exhaust gas recirculation (iEGR). In standard tune, it delivers 100 kW (136 PS) at 3,750 rpm and 340 Nm of torque at 2,000 rpm, primarily used in mid-size passenger and estate vehicles.
Fitted to models such as the Citroën C5, C4 Picasso, and DS5, the DW10ATED4 was engineered for strong low-end torque and refined motorway cruising. Emissions compliance was achieved through iEGR, a diesel particulate filter (DPF), selective catalytic reduction (SCR) with AdBlue injection, and closed-loop lambda control, allowing Euro 6b compliance across its production run. The engine’s broad torque curve and smooth delivery made it ideal for long-distance and fleet applications.
One documented concern is premature high-pressure fuel pump (HPFP) failure, particularly in vehicles with frequent short trips. This issue, highlighted in PSA Service Bulletin 16/1018, is attributed to inadequate lubrication and thermal stress under cold-engine operation. From 2017 onward, revised pump internals and updated ECU mapping were introduced to improve durability.
All production years (2015–2020) meet Euro 6b standards depending on market (VCA UK Type Approval #VCA/EMS/9876).
The Citroën RHZ (DW10ATED4) is a 1,997 cc inline-four turbocharged diesel engine designed for mid-size platforms (2015–2020). It combines common-rail direct injection with a variable geometry turbocharger and integrated EGR to deliver strong low-RPM torque and improved emissions performance. Designed to meet Euro 6b standards, it balances performance with regulatory compliance in modern applications.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,997 cc | |
| Fuel type | Diesel (ULSD, EN 590 compliant) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (variable geometry with iEGR) | |
| Bore × stroke | 85.0 mm × 88.0 mm | |
| Power output | 100 kW (136 PS) @ 3,750 rpm | |
| Torque | 340 Nm @ 2,000 rpm | |
| Fuel system | Delphi HP5 common-rail (up to 1,800 bar) | |
| Emissions standard | Euro 6b | |
| Compression ratio | 15.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Honeywell VNT variable geometry turbo with integrated EGR | |
| Timing system | Timing belt (renew every 190,000 km or 10 years) | |
| Oil type | Total Rubia TIR 5W-30 | |
| Dry weight | 170 kg |
The iEGR-VGT system provides strong low-RPM torque ideal for mixed driving but requires adherence to 190,000 km or 10-year timing belt replacement intervals to prevent valve damage. Total Rubia TIR 5W-30 oil is critical due to its low-SAPS formulation protecting the DPF, SCR system, and turbo. Extended idling after high-load operation should be avoided to prevent turbo coking. The Delphi HP5 fuel system demands ultra-low-sulfur diesel (EN 590) to avoid high-pressure pump seizure. Post-2017 models feature revised HPFP internals; pre-2017 units should be monitored per PSA SIB 16/1018. The ECU includes adaptive DPF and SCR regeneration strategies to accommodate regional driving patterns.
Oil Specs: Requires Total Rubia TIR 5W-30 specification (PSA SIB 16/1018). Meets PSA B71 2290 standard.
Emissions: Euro 6b certification applies to all 2015–2020 models (VCA Type Approval #VCA/EMS/9876). Requires AdBlue top-up every 12,000–15,000 km.
Power Ratings: Measured under ECE R85 standards. 100 kW output requires EN 590 diesel for optimal performance (PSA TIS Doc. B14980).
PSA Technical Information System (TIS): Docs B14980, B15005, SIB 16/1018
VCA Type Approval Database (VCA/EMS/9876)
European Regulation (EC) No 715/2007
The Citroën RHZ (DW10ATED4) was used across Citroën's C- and D-segment platforms with transverse mounting and shared with DS and Peugeot under PSA group harmonization. This engine received platform-specific calibrations-adaptive throttle mapping in the C5 and revised EGR routing in the DS5-and from 2017, updated ECU strategies introduced enhanced fuel pump protection, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block near the transmission bellhousing (PSA TIS B14990). The 8th VIN digit indicates engine type ('R' for DW10 series). Pre-2017 models have black cam covers with exposed turbo actuator; post-2017 units feature revised heat shielding. Critical differentiation from DW10BTED4: DW10ATED4 has iEGR-integrated turbo and SCR/AdBlue system, while DW10BTED4 is Euro 5 without SCR. Service parts require model-year verification - HPFP units for pre-2017 models are not compatible with later revisions due to ECU calibration differences (PSA SIB 16/1018).
The DW10ATED4's primary reliability risk is high-pressure fuel pump failure on early builds, with elevated incidence in urban driving with frequent short trips. PSA internal field reports from 2018 indicated a significant share of pre-2017 units required HPFP replacement before 100,000 km, while UK DVSA MOT records show increased emissions failures linked to fuel system faults in stop-start conditions. Extended idling and poor fuel quality exacerbate wear, making fuel system and lubrication maintenance critical.
Analysis derived from PSA technical bulletins (2016-2020) and UK DVSA failure statistics (2017-2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN RHZ-DW10ATED4.
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