The Citroën RHJ, known internally as DW10BTED4, is a 1,997 cc, inline-four turbocharged diesel engine produced between 2012 and 2018. It features a DOHC 16-valve configuration, high-pressure common-rail direct injection (up to 1,600 bar), and a variable geometry turbocharger (VGT). In standard tune, it delivers 81 kW (110 PS) at 3,600 rpm and 270 Nm of torque at 1,750 rpm, primarily used in compact and mid-size passenger vehicles.
Fitted to models such as the Citroën C5, C4 Picasso, and Peugeot 508, the DW10BTED4 was engineered for refined low-end torque and fuel-efficient operation. Emissions compliance was achieved through exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and closed-loop lambda control, allowing Euro 5 compliance across its production run. The engine’s smooth power delivery made it ideal for family and fleet applications with mixed driving conditions.
One documented concern is premature high-pressure fuel pump (HPFP) wear, particularly in vehicles with frequent short trips. This issue, highlighted in PSA Service Bulletin 14/1028, is attributed to inadequate lubrication and thermal stress under cold-engine operation. From 2015 onward, revised pump internals and updated ECU mapping were introduced to improve durability.
Production years 2012–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6b depending on market (VCA UK Type Approval #VCA/EMS/7788).
The Citroën RHJ (DW10BTED4) is a 1,997 cc inline-four turbocharged diesel engine designed for mid-size platforms (2012–2018). It combines common-rail direct injection with a variable geometry turbocharger to deliver strong low-RPM torque and efficient cruising. Designed to meet Euro 5 and later Euro 6b standards, it balances economy with drivability in family-oriented 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) | |
| Bore × stroke | 85.0 mm × 88.0 mm | |
| Power output | 81 kW (110 PS) @ 3,600 rpm | |
| Torque | 270 Nm @ 1,750 rpm | |
| Fuel system | Delphi HP4 common-rail (up to 1,600 bar) | |
| Emissions standard | Euro 5 (2012–2014); Euro 6b (2015–2018) | |
| Compression ratio | 16.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Honeywell VNT variable geometry turbo | |
| Timing system | Timing belt (renew every 190,000 km or 10 years) | |
| Oil type | Total Rubia TIR 5W-30 | |
| Dry weight | 168 kg |
The VGT turbo 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 and turbo. Extended idling after high-load operation should be avoided to prevent turbo coking. The Delphi HP4 fuel system demands ultra-low-sulfur diesel (EN 590) to avoid high-pressure pump seizure. Post-2015 models feature revised HPFP internals; pre-2015 units should be monitored per PSA SIB 14/1028. The ECU includes adaptive DPF regeneration strategies to accommodate regional driving patterns.
Oil Specs: Requires Total Rubia TIR 5W-30 specification (PSA SIB 14/1028). Meets PSA B71 2290 standard.
Emissions: Euro 5 certification applies to 2012–2014 models (VCA Type Approval #VCA/EMS/7788). Euro 6b compliance from 2015 varies by market.
Power Ratings: Measured under ECE R85 standards. 81 kW output requires EN 590 diesel for optimal performance (PSA TIS Doc. B14900).
PSA Technical Information System (TIS): Docs B14900, B14925, SIB 14/1028
VCA Type Approval Database (VCA/EMS/7788)
European Regulation (EC) No 715/2007
The Citroën RHJ (DW10BTED4) was used across Citroën's C- and D-segment platforms with transverse mounting and shared with Peugeot and DS under PSA group harmonization. This engine received platform-specific calibrations-adaptive throttle mapping in the C5 and revised EGR routing in the C4 Picasso-and from 2015, Euro 6b-compliant variants introduced cooled EGR and enhanced lambda control, 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 B14910). The 8th VIN digit indicates engine type ('R' for DW10 series). Pre-2015 models have black cam covers with exposed turbo actuator; post-2015 units feature revised heat shielding. Critical differentiation from DW10TED: DW10BTED4 has Delphi HP4 pump and 270 Nm torque, while DW10TED is 136 PS with 340 Nm. Service parts require model-year verification - HPFP units for pre-2015 models are not compatible with later Euro 6b variants due to ECU calibration differences (PSA SIB 14/1028).
The DW10BTED4's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in urban driving with frequent short trips. PSA internal field reports from 2016 indicated a significant share of pre-2015 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 (2014-2018) and UK DVSA failure statistics (2015-2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN RHJ-DW10BTED4.
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