The Renault M9R 834 is a 2,188 cc, inline‑four turbo‑diesel engine produced between 2010 and 2018. It features common‑rail direct injection, a variable geometry turbocharger (VGT), dual overhead camshafts (DOHC), and a diesel particulate filter (DPF). Power output ranges from 110 kW (150 PS) to 120 kW (163 PS) with torque figures of 340–380 Nm.
Fitted to models such as the Laguna III, Mégane III, Scénic III, and Koleos, the M9R 834 was engineered for refined cruising, stro…
Production years 2010–2014 meet Euro 5 standards; 2015–2018 models may have Euro 6 compliance depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Renault M9R 834 is a 2,188 cc inline‑four turbo‑diesel engineered for mid‑size and SUV platforms (2010–2018). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver strong low‑rpm torque and smooth highway performance. Designed to meet Euro 5 (and select Euro 6) standards, it balances drivability with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,188 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 88.0 mm × 90.0 mm | |
Power output | 110–120 kW (150–163 PS) | |
Torque | 340–380 Nm @ 2,000 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 1,800 bar) | |
Emissions standard | Euro 5 (pre‑2015); Euro 6 depending on market | |
Compression ratio | 15.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett) | |
Timing system | Chain (front‑mounted) | |
Oil type | Renault RN0720 (SAE 5W‑30) | |
Dry weight | 178 kg |
The Renault M9R 834 was used across Renault's Laguna III/Mégane III platforms with longitudinal mounting and shared with Nissan for transverse applications in European markets. This engine received platform-specific adaptations—reinforced mounts in the Koleos and revised exhaust routing in the Scénic III—and from 2015 the facelifted Mégane IV adopted the M9R Gen 3 with dual-loop EGR, creating interchange limits. Partnerships allowed Nissan's dCi 160 units to leverage Renault's common-rail architecture. All adaptations are documented in OEM technical bulletins.
The M9R 834's primary reliability risk is high-pressure fuel pump (HPFP) drive gear wear, with elevated incidence in short-trip urban use. Renault internal quality reports from 2014 indicated a notable share of pre-2013 engines requiring HPFP replacement before 100,000 km, while UK DVSA MOT data links DPF regeneration failures to frequent stop-start driving. Cold starts and infrequent oil changes accelerate wear, making oil spec and interval adherence critical.
Analysis derived from Renault technical bulletins (2012–2017) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The M9R 834 offers strong torque and smooth operation, but early models (2010–2013) are prone to HPFP drive gear wear. Later revisions (post-2013) improved oiling and durability. With strict adherence to 15,000 km oil changes using RN0720 oil, well-maintained examples can exceed 200,000 km reliably.
Top issues include HPFP drive gear failure, DPF clogging from short trips, EGR valve/cooler fouling, and turbo actuator sticking. These are documented in Renault SIB 6057A and TIS bulletins. Regular oil changes and proper driving cycles mitigate most risks.
The M9R 834 powered the Laguna III, Mégane III, Scénic III, and Koleos from 2010–2016 in dCi 150/160 variants. Nissan also used it in the Qashqai (2014–2018) as the dCi 160. All are Euro 5–compliant, with some late models meeting Euro 6.
Yes. Stage 1 ECU remaps typically yield +20–30 kW safely, as the internals handle torque well. Supporting upgrades (intercooler, DPF delete in off-road use) can enable higher outputs. However, HPFP reliability must be addressed—especially on pre-2013 units—before aggressive tuning.
In a Mégane III dCi 160, expect ~6.2 L/100km city and ~4.5 L/100km highway, or ~48 mpg UK combined. Real-world mixed driving typically yields 45–52 mpg (UK). Economy suffers significantly with frequent short trips due to DPF regeneration demands.
Yes. The M9R series is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. While chain life is generally robust, any unusual noise warrants immediate inspection.
Renault specifies 5W-30 synthetic oil meeting RN0720 standard. This is critical for HPFP lubrication and chain longevity. Always use OEM-approved oil and change every 15,000 km or annually—whichever comes first.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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