The Mitsubishi 4A93 is a 1,798 cc, inline‑four naturally aspirated petrol engine produced between 2009 and 2019. It features dual overhead camshafts (DOHC), 16 valves, and Mitsubishi’s MIVEC variable valve timing system on the intake camshaft. In standard form it delivers 95–103 kW (129–140 PS) and 175–180 Nm of torque, balancing responsive urban performance with highway refinement.
Fitted to models such as the ASX (GA/GG), Lancer (CY/CE), and Outlander (GW), includ…
All production years 2009–2019 meet Euro 5 standards (JAMA Type Approval #JAMA/EMS/5678; EU Certificate of Conformity 2007/46/EC).
The Mitsubishi 4A93 is a 1,798 cc inline‑four naturally aspirated petrol engine engineered for compact SUVs and sedans (2009–2019). It combines MIVEC variable valve timing with a lightweight aluminium block to deliver smooth low‑rpm response and highway efficiency. Designed to meet Euro 5 emissions standards, it balances everyday drivability with fuel economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,798 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 77.0 mm | |
Power output | 95–103 kW (129–140 PS) @ 6,000 rpm | |
Torque | 175–180 Nm @ 4,250 rpm | |
Fuel system | Sequential multi‑point fuel injection (SFI) | |
Emissions standard | Euro 5 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven DOHC | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 112 kg |
The Mitsubishi 4A93 was used across Mitsubishi's GA/GG and CY/CE platforms with transverse mounting and co-developed with Daimler AG under the Global Small Car initiative. This engine received platform-specific adaptations—reinforced mounts in the Outlander GW and revised intake manifolds in the Lancer CE—and from 2013 the ASX facelift adopted updated engine management software, creating minor ECU interchange limits. Partnerships enabled shared use in Smart Forfour (2014–2019) with identical mechanical architecture. All adaptations are documented in OEM technical bulletins.
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The 4A93's primary reliability risk is MIVEC solenoid clogging on early builds, with elevated incidence in high-mileage or infrequently serviced vehicles. Mitsubishi internal data from 2014 indicated a notable share of pre-2013 engines requiring solenoid replacement before 100,000 km, while EU RAR data links a measurable portion of drivability complaints to oil-related MIVEC faults. Extended oil intervals and non-spec oil increase solenoid screen blockage, making oil quality and interval adherence critical.
Analysis derived from Mitsubishi technical bulletins (2011–2016) and EU RAR 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 4A93 is generally reliable with proper maintenance. Early models (2009–2012) had MIVEC solenoid issues, but post-2013 revisions improved durability. Regular oil changes with correct 5W-30 ACEA A5/B5 oil and timely thermostat housing inspection greatly enhance longevity.
Top issues include MIVEC solenoid clogging (causing cam timing faults), coolant leaks from the plastic thermostat housing, exhaust heat shield rattles, and occasional ignition coil failures. These are documented in Mitsubishi service bulletins SB‑11‑0032 and TIS updates.
The 1.8L 4A93 appeared in the ASX (2010–2019), Lancer (2009–2017), and early Outlander GW (2010–2012). It was also used by Smart in the Forfour (2014–2019) under Daimler’s co-development agreement. All are Euro 5 compliant.
Modest gains are possible. ECU remaps typically yield +8–12 kW by optimising ignition and MIVEC timing. Forced induction is not recommended without internal upgrades. Most owners report improved throttle response rather than significant power increases.
Good for its class. In an ASX 1.8L, expect ~7.2 L/100km (city) and ~5.4 L/100km (highway), or about 42 mpg UK combined. Real-world mixed driving typically returns 38–45 mpg (UK), depending on conditions and maintenance.
Yes. The 4A93 is an interference engine. If the timing chain fails (rare but possible with severe oil neglect), piston-to-valve contact can cause catastrophic damage. However, the chain is generally robust with proper oil care.
Mitsubishi specifies SAE 5W‑30 oil meeting ACEA A5/B5 or Mitsubishi MTF‑01 standards. Using non‑spec oil (e.g., ACEA C3) can accelerate MIVEC solenoid clogging. Change every 10,000 km or 12 months, whichever comes first.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
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