The Volkswagen ARX is a 1,968 cc, inline‑four turbo‑diesel engine produced between 2008 and 2015. It features a double overhead camshaft (DOHC) design, common rail direct injection, and a variable geometry turbocharger (VGT), delivering outputs between 103–125 kW (140–170 PS) and 320–350 Nm of torque. The VGT enables strong low-rpm torque for effortless overtaking and towing.
Fitted to models such as the Mk6 Golf, Jetta, Passat B7, and Tiguan, the ARX was engineered for a blend of spirited performance and long-distance cruising refinement. Emissions compliance for most units was achieved through a diesel particulate filter (DPF) and exhaust gas recirculation (EGR), meeting Euro 5 standards across its primary production run.
One documented concern is potential failure of the high-pressure fuel pump, which can lead to a no-start condition or severe power loss. This issue, referenced in Volkswagen Group Service Technical Bulletin 2033865/1, is often linked to fuel lubricity or contamination. Around 2012, revised pump internals were introduced to improve durability.
Volkswagen
Production years 2008–2015 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/5678).
The Volkswagen ARX is a 1,968 cc inline‑four turbo‑diesel engineered for compact and mid‑size models (2008-2015). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver strong low‑rpm torque and efficient cruising. Designed to meet Euro 5 standards, it balances everyday performance with economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,968 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 81.0 mm × 95.5 mm | |
| Power output | 103–125 kW (140–170 PS) | |
| Torque | 320–350 Nm @ 1,750–2,500 rpm | |
| Fuel system | Bosch CP4 common‑rail (up to 1,800 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 16.2:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single variable‑geometry turbo (Honeywell) | |
| Timing system | Chain (maintenance-free design) | |
| Oil type | VW 507 00 (SAE 5W‑30) | |
| Dry weight | 158 kg |
The VGT turbo provides strong low-RPM torque ideal for highway merging but requires strict adherence to 15,000 km oil change intervals using VW 507 00 specification to protect the high-pressure fuel pump and turbo bearings. Ultra-low-sulfur diesel (ULSD) meeting EN 590 standards is mandatory to prevent CP4 pump failure. EGR and DPF systems are robust but require periodic long-distance driving for passive regeneration. Post-2012 models feature the revised CP4.2 pump; pre-2012 units are more susceptible to wear per STB 2033865/1.
Oil Specs: Requires VW 507 00 (5W-30) specification (Volkswagen Owner's Manual). Critical for fuel system and emissions component longevity.
Emissions: Euro 5 certification applies to all 2008–2015 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under DIN 70020 standards. Peak output requires EU5+ fuel quality (Volkswagen SSP 470).
Volkswagen Service Technical Literature: SSP 470, STB 2033865/1
VCA Type Approval Database (VCA/EMS/5678)
Volkswagen ETKA Parts Catalogue
The Volkswagen ARX was used across Volkswagen's A5/B7 platforms with transverse mounting. This engine received platform-specific adaptations-reinforced mounts in the Tiguan and specific ECU mappings for the Passat-creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the cylinder block, near the timing chain cover (Volkswagen SSP 470). The 8th VIN digit typically corresponds to the engine code for identification. Visually, the ARX can be identified by its black plastic engine cover with "TDI" branding and the location of the EGR valve on the intake manifold. Critical differentiation from the earlier CBEA/CJAA engines: ARX uses a Bosch EDC17CP44 ECU. Service parts, particularly for the fuel system, require verification against the engine's production date due to the mid-cycle pump update.
The ARX's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using non-specified fuel or oil. Volkswagen internal data indicated a notable failure rate for early-production pumps, while adherence to VW 507 00 oil specification and EN 590 fuel standards is critical for long-term pump health.
Analysis derived from Volkswagen technical bulletins (2010-2016) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLKSWAGEN ARX.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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