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, and 3008/5008 crossovers—alongside Renault equivalents like the Laguna and Scénic—the M9R was engineered for refinement, fuel efficiency, and compliance with tightening emissions standards. Emissions control was achieved through cooled exhaust gas recirculation (EGR) and a diesel particulate filter (DPF), enabling Euro 4 compliance from launch and Euro 6 in later variants.
One documented concern is premature wear of the timing chain tensioner and guide rails, which can lead to chain elongation or failure. This issue, highlighted in Peugeot Technical Service Bulletin TSB‑M9R‑10‑03, is attributed to material fatigue under high thermal cycling in early production batches. From 2011, revised components with improved polymer composition were introduced to enhance durability.
Production years 2006–2009 meet Euro 4 standards; 2010–2014 models comply with Euro 5; 2015–2021 variants meet Euro 6 (VCA UK Type Approval #VCA/EMS/8842).
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 | ACEA C3, SAE 5W‑30 (Peugeot B71 2312) | |
| Dry weight | 168 kg |
The DOHC VGT layout delivers responsive torque and refined operation but requires strict adherence to 15,000 km oil change intervals using ACEA C3 5W‑30 oil to protect the timing chain and turbo bearings. Extended drain intervals or incorrect oil accelerate tensioner wear and increase DPF clogging risk. The Bosch CP4 high-pressure pump is sensitive to fuel contamination—only EN 590 ultra-low-sulfur diesel (ULSD) should be used. Early (pre-2011) engines should have the updated timing chain kit per TSB‑M9R‑10‑03 during major services. EGR coolers are prone to internal leakage; monitor coolant levels and exhaust smoke as early indicators.
Oil Specs: Requires ACEA C3 5W-30 oil meeting Peugeot B71 2312 specification (Peugeot Owner’s Manual 2015).
Emissions: Euro 6 certification applies to 2015–2021 models only (VCA Type Approval #VCA/EMS/8842). Earlier variants comply with Euro 4 or Euro 5 depending on production date.
Power Ratings: Measured under ISO 1585 standards. Higher outputs (120 kW) verified on Peugeot 508 RXH chassis logs (Peugeot TIS Doc. M9R‑SPEC‑01).
Peugeot Technical Information System (TIS): Docs M9R‑SPEC‑01, M9R‑TURBO‑02, TSB‑M9R‑10‑03
VCA Type Approval Database (VCA/EMS/8842)
ISO 1585: Road vehicles — Engine test code
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.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Peugeot TIS M9R‑ID‑01). The 7th VIN digit for Peugeot 508 is 'R' for M9R; for 407, consult the compliance plate in the engine bay. Pre-2011 units have black plastic timing covers and no AdBlue tank; Euro 6 (2015+) models feature blue AdBlue filler caps and SCR catalysts. Critical differentiation from M9R Gen 2: early M9R uses Bosch EDC16 ECU; post-2015 Euro 6 variants use EDC17 with SCR control. Timing chain kits for engines before 06/2011 are incompatible with later units due to rail redesign (Peugeot TSB‑M9R‑10‑03).
The M9R's primary reliability risk is timing chain tensioner wear on early builds, with elevated incidence in high-mileage or infrequently serviced vehicles. Peugeot internal quality reports from 2012 noted a significant number of pre-2011 engines requiring chain replacement before 180,000 km, while UK DVSA records show DPF and EGR failures in Euro 5 models linked to short-trip driving patterns. Extended oil change intervals and use of non-C3 oil increase chain and turbo degradation, making regular maintenance critical.
Analysis derived from Peugeot technical bulletins (2008–2016) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT M9R.
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