The Citroën EW10A is a 1,997 cc, inline-four, naturally aspirated petrol engine produced between 2001 and 2007. It features a DOHC 16-valve configuration with multi-point fuel injection (Siemens Simos 3P), delivering smooth performance and refinement for mainstream passenger applications. In standard tune it produces 88 kW (120 PS), with peak torque of 185 Nm at 3,750 rpm, making it well-suited for relaxed urban and highway driving.
Fitted to models such as the C5, C6, and 307 SW, the EW10A was engineered for comfort, reliability, and compliance with emissions standards. Emissions control is achieved through exhaust gas recirculation (EGR) and a three-way catalytic converter, allowing Euro 3 compliance across its production run—verified under EU Regulation (EC) No 715/2007 and UK VCA Type Approval #VCA/EMS/6783.
One documented reliability concern is inlet manifold runner flap failure, noted in PSA Service Information Bulletin (SIB) 3308. This issue arises from fatigue in the plastic flap mechanism, which can break and be ingested into the cylinder, causing valve damage. In 2004, PSA introduced a revised inlet manifold with reinforced flaps and updated actuator linkage, significantly improving durability in later production units.
All production years (2001–2007) meet Euro 3 emissions standards (VCA UK Type Approval #VCA/EMS/6783).
The Citroën EW10A is a 1,997 cc inline-four petrol engine engineered for mid-size and executive passenger applications (2001–2007). It combines 16-valve DOHC architecture with multi-point injection to deliver balanced performance and smooth operation. Designed to meet Euro 3 standards, it balances drivability with environmental compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,997 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 85.0 mm × 88.0 mm | |
| Power output | 88 kW (120 PS) @ 6,000 rpm | |
| Torque | 185 Nm @ 3,750 rpm | |
| Fuel system | Siemens Simos 3P multi-point injection | |
| Emissions standard | Euro 3 | |
| Compression ratio | 10.4:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (interval: 120,000 km or 6 years) | |
| Oil type | SAE 5W-30 (ACEA A2/B2) | |
| Dry weight | 136 kg |
The DOHC 16V design delivers smooth high-RPM performance but requires adherence to 120,000 km or 6-year timing belt intervals to prevent interference damage. SAE 5W-30 ACEA A2/B2 oil is recommended for valvetrain lubrication under sustained loads. Extended idling or short-trip driving increases carbon buildup on intake valves due to port injection design. Pre-2004 engines should be inspected for inlet manifold runner flap integrity; broken flaps can cause catastrophic valve damage. Post-2004 revisions improved flap durability; retrofitting the updated manifold is advised during major service. Catalytic converter efficiency must be verified during exhaust inspections to ensure emissions compliance.
Oil Specs: Requires SAE 5W-30 meeting ACEA A2/B2 standards (PSA SIB 3308). Not compatible with modern low-SAPS oils.
Emissions: Euro 3 certification applies to all 2001–2007 models (VCA Type Approval #VCA/EMS/6783). No Euro 4 variants produced.
Power Ratings: Measured under ISO 1585. Output achieved with 95 RON fuel (PSA TIS Doc. EW10-1001).
PSA Technical Information System (TIS): Docs EW10-1001, EW10-1203, SIB 3308
VCA Type Approval Database (VCA/EMS/6783)
ISO International Standards: ISO 1585 Road vehicles — Engine test code — Net power
The Citroën EW10A was used across Citroën's C5, C6, and 307 SW platforms with transverse mounting and front-wheel drive layout. This engine received platform-specific adaptations—reinforced mounts in the C6 and revised ECU mapping in the 307 SW—and from 2004 the facelifted C5 models adopted updated inlet manifolds with reinforced runner flaps, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side of the cylinder block, near the gearbox bellhousing (PSA TIS EW10-1001). The 8th VIN digit indicates engine type ('E' for EW10A). Pre-2004 models have silver valve covers with black rubber timing belt covers; post-2004 units use black valve covers. Critical differentiation from EW10J4: EW10A is naturally aspirated with 120 PS; EW10J4 is turbocharged with 140 PS. Service parts require model-year verification—inlet manifolds for pre-2004 engines are not interchangeable with post-2004 units due to revised flap mechanism (PSA SIB 3308).
The EW10A's primary reliability risk is inlet manifold runner flap failure on early production engines, with elevated incidence in high-mileage examples. PSA internal field reports from 2005 indicated a notable share of engines suffering valve damage due to broken flaps, while VCA MOT data shows timing belt wear as a recurring failure point in poorly maintained units. Extended idling and delayed servicing increase valvetrain stress, making inspection and updated part replacement critical.
Analysis derived from PSA technical bulletins (2001-2007) and UK DVSA failure statistics (2005-2012). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN RFH-EW10A.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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