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 estat…
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 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.
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.
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The DW10ATED4 is generally reliable when maintained properly. Early models (2015–2016) had high-pressure fuel pump concerns, but post-2017 revisions improved durability. Regular timing belt changes (every 190,000 km or 10 years) and using PSA-approved 5W-30 oil significantly enhance longevity. Well-maintained engines can exceed 200,000 km reliably.
Key issues include high-pressure fuel pump failure (pre-2017), DPF and SCR clogging due to short trips, turbo actuator sticking, and timing belt failure if overdue. These are documented in PSA service bulletins. Preventive maintenance and proper driving habits greatly reduce risk.
This 2.0L diesel was used in Citroën C5 (2015–2020) and C4 Picasso (2015–2018). It was also shared with DS5 and Peugeot 508 under PSA platform-sharing agreements. All models meet Euro 6b standards.
Yes. The engine responds well to ECU remapping, with stage 1 tunes safely achieving 160–170 PS. Supporting mods like intercooler and exhaust upgrades allow further gains. However, over-tuning increases stress on the fuel pump and turbo. Use reputable tuners familiar with PSA BlueHDi systems.
Excellent for a 2.0L diesel. In a C5 2.0 BlueHDi 136, combined consumption is ~5.0 L/100 km (~57 mpg UK). City driving may see 5.8–6.5 L/100 km, while highway runs can achieve ~4.4 L/100 km (~64 mpg UK). Real-world figures depend on driving style and vehicle load.
Yes. The DW10ATED4 is an interference engine. If the timing belt fails or jumps, piston-to-valve contact will occur, causing severe internal damage. Strict adherence to 190,000 km or 10-year replacement intervals is essential. Any timing-related symptoms must be addressed immediately.
PSA specifies Total Rubia TIR 5W-30 (meets PSA B71 2290). This low-SAPS oil protects the DPF, SCR, and turbocharger. Change every 15,000 km or annually. Using incorrect oil can lead to DPF blockage and fuel system wear.
Comprehensive technical documentation and regulatory references
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CITROEN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
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