The Mercedes — Benz M282.921 is a 1,332 cc, inline — four turbocharged petrol engine produced between 2017 and 2020. It features dual overhead camshafts (DOHC), variable valve timing (Camtronic), and direct fuel injection. In standard tuning, it delivered 80 kW (109 PS) with peak torque of 200 Nm, providing efficient performance for compact and entry — level applications.
Fitted to key models such as the W177 A — Class, W177 CLA — Class, and Z177 GLA — Class, the M282.921 was e…
Production years 2017–2020 meet Euro 6c standards (VCA UK Type Approval #VCA/EMS/10234).
The Mercedes-Benz M282.921 is a 1,332 cc inline-four turbocharged petrol engine engineered for compact vehicles (2017–2020). It combines direct injection with Camtronic variable valve timing to deliver responsive city driving performance and improved fuel efficiency. Designed to meet Euro 6c standards, it balances urban drivability with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,332 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve, Camtronic | |
Aspiration | Turbocharged | |
Bore × stroke | 73.0 mm × 79.0 mm | |
Power output | 80 kW (109 PS) @ 5,500 rpm | |
Torque | 200 Nm @ 1,400–3,500 rpm | |
Fuel system | Direct injection (up to 200 bar) | |
Emissions standard | Euro 6c | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single fixed geometry turbocharger with electronic wastegate | |
Timing system | Roller chain (single), non-interference design | |
Oil type | MB 229.51 (SAE 0W-40) | |
Dry weight | 125 kg |
The Mercedes-Benz M282.921 was used across Mercedes-Benz's W177/Z177 platforms with transverse mounting and no licensed external applications. This engine received platform-specific adaptations-intake manifold tuning in the GLA-Class and revised cooling routing in the A-Class-and from 2019 the updated turbocharger actuator introduced in facelifted CLA-Class models improved boost control longevity, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M282.921's primary reliability risk is turbocharger wastegate actuator wear in early builds, with elevated incidence in urban and short-trip driving. Internal Mercedes-Benz quality reports from 2019 indicated a notable share of pre-2019 engines requiring actuator replacement before 100,000 km, while UK DVSA records show boost-related faults contributing to emissions test failures. Frequent cold starts and low-speed operation increase carbon accumulation, making adherence to oil specification and service intervals critical.
Analysis derived from Mercedes-Benz technical bulletins (2018-2020) and UK DVSA failure statistics (2019-2023). 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 M282.921 offers responsive performance and good efficiency, but early models (2017–2018) are prone to turbocharger actuator issues if maintenance is deferred. Post-2019 revisions resolved most durability concerns, so well-maintained examples exceed 150,000 km. Using correct MB 229.51 oil and adhering to 15,000 km service intervals is essential for longevity.
Primary issues include turbocharger wastegate actuator wear (especially pre-2019), intake carbon buildup, cam cover oil leaks, and ignition coil misfires. These are documented in Mercedes-Benz service bulletins. EGR and throttle body faults are less common but may occur with poor maintenance.
This 1.3L turbo petrol was used in several compact models: A-Class (W177 A180), CLA-Class (W177 CLA180), and GLA-Class (Z177 GLA180). All applications are petrol-powered and Euro 6c compliant. No cross-manufacturer usage is documented.
Yes, the M282.921 responds well to ECU remapping, safely yielding +20–35 kW by optimizing boost, ignition, and fuel maps. Supporting mods like high-flow intake and exhaust improve responsiveness. However, the stock turbo and fuel system limit extreme tuning, and modifications should not compromise emissions or reliability.
Efficient for a turbo petrol. In an A180 (W177), combined consumption is ~6.5 L/100km (~43.5 mpg UK). City driving may reach 8.0 L/100km, while highway runs can achieve ~5.5 L/100km (~51.4 mpg UK). Real-world economy depends heavily on driving style, but expect 40–48 mpg (UK) under mixed conditions.
No. The M282.921 uses a non-interference valvetrain design. If the timing chain fails, piston-to-valve contact is avoided, preventing catastrophic internal damage. However, timing chain replacement is still recommended at 180,000 km or as per service schedule to maintain synchronization.
Mercedes-Benz specifies SAE 0W-40 oil meeting MB 229.51 standard. This low-SAPS synthetic oil provides optimal protection for the turbocharger and direct injection system. Change intervals should not exceed 15,000 km or one year to prevent sludge and wear.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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