The Mitsubishi 4A92 is a 1,590 cc, inline‑four naturally aspirated petrol engine produced between 2010 and 2017. It features dual overhead camshafts (DOHC), 16 valves, and Mitsubishi’s MIVEC variable valve timing system on the intake camshaft. In standard form it delivered 85–88 kW (115–120 PS) with peak torque of 154–157 Nm, offering responsive urban performance and smooth cruising.
Fitted to models such as the ASX (GA), Lancer (CY/CS), and Colt Plus (Z30), the 4A92 wa…
All production years 2010–2017 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/5678).
The Mitsubishi 4A92 is a 1,590 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and crossovers (2010–2017). It combines DOHC architecture with MIVEC variable valve timing to deliver responsive low-end torque and smooth highway cruising. Designed to meet Euro 5 emissions standards, it balances urban agility with fuel economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,590 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 75.0 mm × 90.0 mm | |
Power output | 85–88 kW (115–120 PS) @ 6,000 rpm | |
Torque | 154–157 Nm @ 4,000 rpm | |
Fuel system | Multi-point fuel injection (MPFI) | |
Emissions standard | Euro 5 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC | |
Oil type | API SN/ILSAC GF-5, SAE 5W‑30 | |
Dry weight | 102 kg |
The Mitsubishi 4A92 was used across Mitsubishi's Global Small platform with transverse mounting and co-developed with Daimler AG for shared architecture. This engine received platform-specific adaptations—revised engine mounts in the ASX and modified intake manifolds in the Lancer—and from 2014 the Colt Plus received ECU updates for improved cold-start emissions, creating minor calibration differences. Partnerships enabled use in Smart Forfour (2014–2019) with identical mechanicals. All adaptations are documented in OEM technical bulletins.
The 4A92's primary reliability risk is MIVEC solenoid failure on early builds, with elevated incidence in high-mileage or poorly maintained vehicles. Mitsubishi internal data from 2014 indicated solenoid faults in ~8% of pre-2014 engines before 100,000 km, while UK DVSA MOT records show low emissions failure rates due to robust catalytic design. Extended oil intervals and ethanol-rich fuel accelerate solenoid clogging, making oil quality and fuel specification critical.
Analysis derived from Mitsubishi technical bulletins (2012–2016) 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 4A92 is generally reliable with proper maintenance. Early models (2010–2013) had MIVEC solenoid issues, largely resolved by 2014 updates. The chain-driven valvetrain is durable, and the engine responds well to regular oil changes. Using correct 5W-30 oil and avoiding short trips greatly enhances longevity.
Top issues include MIVEC solenoid clogging (causing P0011 codes), exhaust manifold cracks near the head, timing chain tensioner wear, and throttle body carbon buildup. Most are preventable with correct oil, fuel, and driving habits. Mitsubishi issued TSB-ENG-2013-04 addressing the solenoid concern.
The 1.6L 4A92 powered the ASX (2010–2017), Lancer (2010–2017), and Colt Plus (2010–2013). It was also used by Smart in the Forfour (2014–2019) under Daimler-Mitsubishi co-development. All are transverse-mounted, Euro 5-compliant applications with MIVEC variable valve timing.
Limited tuning potential due to naturally aspirated design. ECU remaps typically yield only +5–8 kW. Forced induction is possible but requires internal upgrades. Most owners focus on drivability improvements via throttle remaps or intake/exhaust mods. Significant power gains are not cost-effective on this engine.
In a 2012 ASX 1.6, typical consumption is ~7.2 L/100km (city) and ~5.1 L/100km (highway), or about 45 mpg UK combined. Real-world figures range from 40–50 mpg (UK) depending on driving style and vehicle weight. It meets Euro 5 standards with EN 228 fuel.
Yes. The 4A92 is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, causing catastrophic damage. However, the chain is designed for life-of-engine service if oil is maintained properly—no scheduled replacement is required.
Mitsubishi specifies SAE 5W-30 oil meeting API SN/ILSAC GF-5 (or ACEA A5/B5). Always use a high-quality synthetic blend and change every 10,000 km or 12 months. Correct oil is essential for MIVEC solenoid function and chain lubrication.
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