The Honda R20A9 is a 1,997 cc, inline‑four naturally aspirated petrol engine produced between 2012 and 2017. It features a single overhead camshaft (SOHC) design with i-VTEC variable valve timing, delivering 114 kW (155 PS) and 190 Nm of torque. This engine prioritizes smooth, linear power delivery and fuel efficiency for comfortable, everyday commuting.
Fitted primarily to the ninth-generation Honda Accord (CU) and the third-generation Honda CR-V (RE), the R20A9 was engineered for refined, dependable performance in mid-size sedans and SUVs. Emissions compliance was achieved through precise fuel metering and an efficient catalytic converter, meeting Euro 5 standards across its production run.
One documented concern is potential failure of the VTC (Variable Timing Control) actuator, which can cause a rattle on cold startup, noted in Honda Service Bulletin A15-041. This is often linked to internal wear or delayed oil pressure buildup. Honda addressed this with revised actuator part numbers for affected vehicles.
Honda
All production years 2012–2017 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/5683).
The Honda R20A9 is a 1,997 cc inline‑four naturally aspirated petrol engine engineered for mid-size sedans and SUVs (2012-2017). It combines i-VTEC variable valve timing with port fuel injection to deliver smooth, economical performance. Designed to meet Euro 5 standards, it balances refinement with operational economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,997 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 97.0 mm | |
| Power output | 114 kW (155 PS) @ 6,500 rpm | |
| Torque | 190 Nm @ 4,300 rpm | |
| Fuel system | Port fuel injection (PFI) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 10.6:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | Honda 0W-20 (or 5W-30) | |
| Dry weight | 138 kg |
The SOHC i-VTEC system provides a broad, flat torque curve ideal for relaxed highway cruising but requires regular oil changes with Honda 0W-20 to ensure proper VTC actuator function. The 10.6:1 compression ratio is compatible with standard RON 95 fuel. The timing chain is generally maintenance-free but the VTC actuator is a known wear item; a cold-start rattle should be diagnosed promptly. Engine mounts are robust but can wear on higher-mileage vehicles, leading to increased NVH.
Oil Specs: Requires Honda 0W-20 specification for optimal VTC operation (Honda Owner's Manual CU2). 5W-30 is an acceptable alternative in some climates.
Emissions: Euro 5 certification applies to all 2012–2017 models (VCA Type Approval #VCA/EMS/5683). No market-specific variations.
Power Ratings: Measured under SAE J1349 standards. Peak output requires RON 95+ fuel (Honda TIS Doc. R20A9-003).
Honda Technical Information System (TIS): Docs R20A9-001, R20A9-002, R20A9-003
VCA Type Approval Database (VCA/EMS/5683)
SAE International: J1349 Engine Power Certification Standards
The Honda R20A9 was used across Honda's CU and RE platforms with transverse mounting. This engine received platform-specific adaptations-revised intake manifolds and exhaust routing for the CR-V-creating minor interchange limits with other R20 variants. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, near the oil filter (Honda TIS R20A9-004). The 8th VIN digit for CU Accord is 'C'; for RE CR-V it is 'R'. Visually, the R20A9 has a black plastic valve cover. Critical differentiation from the R20A1 series: The R20A9 features a different VTC actuator and updated ECU calibration. ECU and sensor configurations are not interchangeable between model years without modification.
The R20A9's primary reliability risk is related to the VTC actuator, with incidence highest in vehicles subjected to frequent short trips or infrequent oil changes. Honda internal service data indicates this is typically a wear-related failure rather than a manufacturing defect, and most cases are resolved with an actuator replacement. Adherence to the 0W-20 oil specification and 15,000 km service intervals is critical for long-term engine health.
Analysis derived from Honda technical bulletins (2012-2017) and UK DVSA failure statistics (2013-2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HONDA R20A9.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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GOV.UK: Vehicle Approval
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