The Peugeot M9R is a 2,188 cc, inline‑four turbo‑diesel engine co‑developed with Renault and produced from 2006 to 2021. It features a dual overhead camshaft (DOHC), 16‑valve architecture with common‑rail direct injection and a variable geometry turbocharger (VGT). Power outputs range from 84 kW (115 PS) to 120 kW (163 PS), with torque between 270–380 Nm, providing strong low‑rpm pulling power for mid‑size applications.
Fitted to models such as the Peugeot 407, 508, an…
Production years 2006–2009 meet Euro 4 standards; 2010–2014 models comply with Euro 5; 2015–2021 variants meet Euro 6 .
The Peugeot M9R is a 2,188 cc inline‑four turbo‑diesel engineered for mid‑size sedans and SUVs (2006–2021). It combines Bosch common‑rail injection with a single variable‑geometry turbocharger to deliver strong low‑rpm torque and smooth highway cruising. Designed to meet Euro 4 through Euro 6 emissions standards across its production life, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,188 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 84.0 mm × 98.8 mm | |
Power output | 84–120 kW (115–163 PS) | |
Torque | 270–380 Nm @ 1,750–2,500 rpm | |
Fuel system | Bosch CP3/CP4 common‑rail (up to 1,800 bar) | |
Emissions standard | Euro 4 (2006–2009); Euro 5 (2010–2014); Euro 6 (2015–2021) | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett or BorgWarner) | |
Timing system | Chain (front‑mounted; tensioner wear‑prone) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 168 kg |
The Peugeot M9R was used across Peugeot's 407/508 platforms with transverse mounting and shared extensively with Renault, Nissan, and Mercedes-Benz under joint development agreements. This engine received platform-specific adaptations—reinforced engine mounts in the 508 RXH and revised EGR routing in the 3008—and from 2015 the 508 received AdBlue SCR systems for Euro 6 compliance, creating emissions-related interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The M9R is robust when maintained properly. Early models (2006–2010) have known timing chain issues, but post-2011 revisions improved durability. Regular oil changes with ACEA C3 5W-30 oil and adherence to DPF regeneration cycles ensure longevity beyond 250,000 km.
Key issues include timing chain tensioner wear (pre-2011), Bosch CP4 fuel pump failure, EGR cooler leaks, and DPF clogging. These are documented in Peugeot TSBs and workshop manuals, with specific repair procedures for each variant.
The M9R powered the Peugeot 407 (2006–2010), 508 (2010–2021), 3008 (2010–2016), and 5008 (2010–2016). It was not used in smaller models like the 208 or 308. The engine is shared with Renault, Nissan, and Mercedes under co-development agreements.
Aftermarket ECU tuning is common on the M9R platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In a Peugeot 508 2.2 HDi (120 kW), typical consumption is ~6.8 L/100km (city) and ~4.9 L/100km (highway), or about 48 mpg UK combined. Real-world figures range from 42–52 mpg UK depending on condition, driving style, and DPF status.
Yes. The M9R is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, causing severe internal damage. Prompt attention to chain rattle or fault codes is critical to prevent catastrophic failure.
Peugeot specifies ACEA C3 5W-30 oil meeting B71 2312 standard. Change every 15,000 km or annually to protect the timing chain, turbocharger, and DPF. Non-C3 oils increase ash buildup and accelerate component wear.
Comprehensive technical documentation and regulatory references
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UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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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.
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