The Citroën 4HT, known internally as DW12BTED4, is a 2,179 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 103 kW (140 PS) at 3,500 rpm and 340 Nm of torque at 1,750 rpm, primarily used in large passenger and estate vehicles.
Fitted to models such as the Citroën C5, C6,…
Production years 2012–2014 meet Euro 5 standards; 2015–2018 models comply with Euro 6b depending on market (VCA UK Type Approval #VCA/EMS/7789).
The Citroën 4HT (DW12BTED4) is a 2,179 cc inline-four turbocharged diesel engine designed for large 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 performance with drivability in premium applications.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,179 cc | |
Fuel type | Diesel (ULSD, EN 590 compliant) | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (variable geometry) | |
Bore × stroke | 85.0 mm × 96.0 mm | |
Power output | 103 kW (140 PS) @ 3,500 rpm | |
Torque | 340 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 | 185 kg |
The Citroën 4HT (DW12BTED4) 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 C6-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.
The DW12BTED4'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.
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The DW12BTED4 is generally reliable when maintained properly. Early models (2012–2014) had high-pressure fuel pump concerns, but post-2015 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 wear (pre-2015), DPF 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 2.2L diesel was used in Citroën C5 (2012–2017) and C6 (2012–2018). It was also shared with Peugeot 508 and DS5 under PSA platform-sharing agreements. Models from 2015–2018 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 HDi systems.
Good for a 2.2L diesel. In a C5 2.2 HDi 140, combined consumption is ~5.8 L/100 km (~49 mpg UK). City driving may see 6.8–7.5 L/100 km, while highway runs can achieve ~5.0 L/100 km (~57 mpg UK). Real-world figures depend on driving style and vehicle load.
Yes. The DW12BTED4 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 and turbocharger. Change every 15,000 km or annually. Using incorrect oil can lead to DPF blockage and fuel system wear.
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