The Nissan CG12DE is a 1,238 cc, inline‑four naturally aspirated petrol engine produced between 1992 and 2002. It features an aluminium block and head, dual overhead camshafts (DOHC), and four valves per cylinder. Output is modest, typically 55–63 kW (75–86 PS) and 105–110 Nm of torque, prioritising fuel efficiency and compact packaging for kei — car regulations.
Fitted primarily to the K11 Micra/March and W10 Cube, the CG12DE was engineered for urban mobility and low ru…
Production years 1992–2002 predate standardized Euro emissions regulations. Compliance was managed under Japanese Ministry of Land, Infrastructure, Transport and Tourism (MLIT) standards applicable at time of manufacture.
The Nissan CG12DE is a 1,238 cc inline‑four naturally aspirated petrol engine engineered for compact city cars (1992-2002). It combines a lightweight aluminium block with a DOHC valvetrain to deliver frugal, responsive performance. Designed for the emissions standards of its era, it prioritizes low weight and serviceability over peak output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,238 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 71.0 mm × 78.0 mm | |
Power output | 55–63 kW (75–86 PS) | |
Torque | 105–110 Nm @ 4,000–4,400 rpm | |
Fuel system | Multi-point electronic fuel injection (MPFI) | |
Emissions standard | Pre-Euro (Japanese 1990s Standards) | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | SAE 5W-30 or 10W-30 (API SG/SH) | |
Dry weight | 85 kg |
The Nissan CG12DE was used across Nissan's K11/W10 platforms with transverse mounting. This engine received platform-specific adaptations-different intake manifolds and ancillary layouts for the Micra versus the Cube. All adaptations are documented in OEM technical bulletins.
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The CG12DE's primary long-term reliability risk is exhaust camshaft lobe wear, with elevated incidence in high-mileage or neglected engines. While not subject to modern failure statistics, Nissan workshop data from the mid-1990s noted this as a recurring wear item. Infrequent oil changes and sustained high-RPM operation accelerate this wear, making regular maintenance critical.
Analysis derived from Nissan technical bulletins (1992-2002) and historical workshop service data. 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
Generally yes, the CG12DE is a simple and robust engine for city driving. Its main long-term concern is exhaust cam lobe wear, which can be mitigated with strict oil change schedules and using the correct low-viscosity oil. With proper care, these engines can reliably reach 150,000–200,000 km.
The most frequent issues are wear of the exhaust camshaft lobes, failure of the ignition coil packs (causing misfires), and weakening of the timing chain tensioner (causing noise). Coolant temperature sensor failure is also a common electrical fault affecting drivability.
The CG12DE was primarily used in the K11 generation Nissan Micra/March (1992-2002) and the first-generation Nissan Cube (W10, 1998-2002). It was the larger engine option alongside the 1.0L CG10DE in these compact models.
Significant power gains are difficult due to its small displacement and focus on economy. Basic modifications like a free-flow air filter or exhaust might yield minor improvements. ECU remapping is uncommon. For more power, the 1.3L CG13DE or 1.4L CGA engine are more suitable bases.
Fuel economy is excellent for city driving. Expect around 5.5–6.5 L/100km (43–51 mpg UK) in mixed driving, depending on the vehicle, condition, and driving style. Its lightweight design and efficient DOHC head contribute to these figures.
No. The Nissan CG12DE is generally considered a non-interference (or 'free-wheeling') engine. If the timing chain fails, the pistons will not contact the valves, preventing catastrophic internal damage, though the engine will stop running.
Nissan originally specified SAE 5W-30 or 10W-30 oil meeting API SG/SH standards. A good quality 5W-30 meeting modern API SN/SP specifications is ideal, especially for protecting the camshafts. Regular oil and filter changes (every 7,500–10,000 km) are crucial for longevity.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
NISSAN 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.
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