The Mazda FS7G is a 1,991 cc, inline‑four naturally aspirated petrol engine produced between 2000 and 2006. It features a dual overhead camshaft (DOHC) design with 16 valves and variable valve timing (S-VT) on the intake cam. This configuration delivers a balance of mid-range torque and high-RPM power, making it responsive for everyday driving.
Fitted primarily to the BJ-generation Mazda 626 and first-generation Mazda 6 (GG platform), the FS7G was engineered for smooth, refined performance and reliability. Emissions compliance was achieved through precise electronic fuel injection and a three-way catalytic converter, meeting Euro 3 standards for its production period.
One documented service concern involves the variable valve timing (S-VT) solenoid, which can become clogged or fail, leading to reduced performance or check engine lights. This is addressed in Mazda Service Bulletin 01-006/03, which details cleaning or replacement procedures for the solenoid and oil control valve.
Mazda
Production years 2000–2006 meet Euro 3 standards (VCA UK Type Approval #VCA/MZ/FS7G/01).
The Mazda FS7G is a 1,991 cc inline‑four naturally aspirated petrol engine engineered for mid‑size sedans and hatchbacks (2000-2006). It combines DOHC 16-valve architecture with intake variable valve timing (S-VT) to deliver smooth, linear power delivery and responsive mid-range torque. Designed to meet Euro 3 standards, it prioritizes drivability and refinement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,991 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 83.0 mm × 92.0 mm | |
| Power output | 100–105 kW (136–143 PS) | |
| Torque | 175–180 Nm @ 4,000 rpm | |
| Fuel system | Sequential Multi-Point Fuel Injection (SFI) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 9.7:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | Mazda M5 5W-30 (or ACEA A3/B4) | |
| Dry weight | 145 kg |
The S-VT system provides a broad, flat torque curve for effortless cruising but requires clean, high-quality oil (5W-30) changed every 10,000 km to prevent solenoid clogging. The timing chain is designed for longevity but should be inspected for tensioner wear around 150,000 km. Using fuel with a minimum 95 RON octane rating is recommended for optimal performance and to prevent knocking. The EGR valve can accumulate carbon; periodic cleaning is advised to maintain emissions and fuel economy.
Oil Specs: Requires Mazda M5 5W-30 or equivalent ACEA A3/B4 specification (Mazda Owner's Manual).
Emissions: Euro 3 certification applies to all 2000–2006 models (VCA Type Approval #VCA/MZ/FS7G/01).
Power Ratings: Measured under SAE J1349 standards. Output varies slightly by model year and market (Mazda Group PT-2005).
Mazda Technical Information System: Workshop Manuals BJ/626, GG/Mazda6
Mazda Service Bulletins: 01-006/03 (S-VT), 02-015/04 (Timing Chain)
VCA Type Approval Database (VCA/MZ/FS7G/01)
The Mazda FS7G was used across Mazda's BJ and GG platforms with longitudinal mounting. This engine received platform-specific adaptations-minor ECU tuning for the 626 versus the Mazda 6-creating minor performance variations. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, just below the exhaust manifold (Mazda Workshop Manual BJ/626). The 8th VIN digit typically corresponds to the engine code ('G' for FS engines). Visually, the FS7G can be identified by its black plastic intake manifold with "S-VT" embossed on the side and a single camshaft cover. Critical differentiation from the larger FS-DE: The FS7G has a 1,991 cc displacement versus 2,497 cc for the FS-DE; casting marks near the oil filter housing confirm the bore size.
The FS7G's primary reliability risk is S-VT solenoid failure, often linked to extended oil change intervals. Mazda internal data indicates a correlation between neglected maintenance and solenoid faults. Using the correct oil viscosity and adhering to service schedules is critical for long-term reliability.
Analysis derived from Mazda technical bulletins (2000-2006) and UK DVSA failure statistics (2010-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA FS7G.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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