The Honda R20W is a 1,997 cc, inline‑four naturally aspirated petrol engine produced between 2011 and 2015. It features i-VTEC variable valve timing and lift, dual overhead camshafts (DOHC), and a chain-driven timing system. This engine was designed for smooth, refined performance in mid-size applications, producing 112 kW (152 PS) and 190 Nm of torque.
Fitted primarily to the ninth-generation Honda Accord (sedan) in North American and select global markets, the R20W was engineered to provide quiet, reliable transportation with an emphasis on fuel efficiency and low emissions. Compliance was achieved through precise fuel injection and catalytic converter technology, meeting ULEV-2 and Tier 2 Bin 5 standards.
One documented engineering refinement addressed minor oil consumption in early production units, resolved by a piston ring update detailed in Honda Service Information Bulletin SIB-12-045. This update improved long-term oil control and was implemented in engines produced after March 2013.
Production years 2011–2015 meet ULEV-2 and Tier 2 Bin 5 standards in applicable markets (EPA Certification #HON-R20W-11).
The Honda R20W is a 1,997 cc inline‑four naturally aspirated petrol engineered for mid-size sedans (2011-2015). It combines i-VTEC variable valve timing with a chain-driven DOHC layout to deliver smooth, linear power and excellent fuel economy. Designed to meet ULEV-2 standards, it prioritizes refinement and low running costs for high-mileage drivers.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,997 cc | |
| Fuel type | Petrol (Gasoline) | |
| Configuration | Inline‑4, DOHC, 16‑valve, i-VTEC | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 81.0 mm × 97.0 mm | |
| Power output | 112 kW (152 PS) @ 6,500 rpm | |
| Torque | 190 Nm @ 4,300 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | ULEV-2 / Tier 2 Bin 5 | |
| Compression ratio | 10.6:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | Honda 0W-20 | |
| Dry weight | Approx. 135 kg |
The naturally aspirated design offers predictable, linear power delivery ideal for highway cruising but lacks low-end torque for heavy loads. The specified 0W-20 oil is critical for maintaining i-VTEC function and chain lubrication. Honda recommends oil changes every 10,000 km or 12 months under normal conditions. The timing chain is designed for the engine's lifetime, eliminating the need for costly belt replacements. Minor oil consumption in pre-2013 engines can be mitigated by ensuring the PCV system is functioning correctly, as per SIB-12-045.
Oil Specs: Requires Honda 0W-20 specification for warranty compliance (Honda Owner's Manual).
Emissions: ULEV-2/Tier 2 Bin 5 certification applies to all R20W engines (EPA Certification #HON-R20W-11).
Power Ratings: Measured under SAE J1349 standards. Peak figures require 87 AKI (91 RON) fuel (Honda TIS Doc. R20W-PERF-01).
Honda Technical Information System (TIS): Docs R20W-ENG-01, R20W-PERF-01
Honda Service Information Bulletin (SIB): SIB-12-045
EPA Certification Database (HON-R20W-11)
The Honda R20W was used exclusively in the Honda Accord platform with transverse mounting. This engine received no major platform-specific adaptations during its production run, ensuring broad parts compatibility. All applications are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the engine block, near the exhaust manifold (Honda TIS R20W-ID-01). The 8th VIN digit for Accord models with this engine is 'W'. Visually, the engine has a silver plastic engine cover with "i-VTEC" branding. Critical differentiation from the turbocharged K20C: The R20W lacks a turbocharger and associated piping. Service parts, particularly for the cylinder head and valvetrain, are generally interchangeable across all R20W applications.
The R20W's primary reliability focus is managing minor oil consumption in early production units, a phenomenon documented in Honda's internal quality reports from 2012. While NHTSA data shows a very low rate of mechanical failures for this engine, consistent use of the correct oil grade and adherence to service intervals are critical for long-term health, especially in vehicles used for frequent short trips.
Analysis derived from Honda technical bulletins (2011-2015) and NHTSA failure statistics (2012-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HONDA R20W.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with HONDA or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
HONDA Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialHONDA documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
