Mercedes M274 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The 2.0-litre turbocharged longitudinal petrol engine fitted to core Mercedes-Benz models from 2012 to 2020, including the C-Class, E-Class, and GLC. Reconditioned Mercedes M274 units are typically available from £3,800 , reflecting consistent specialist demand for this widely used platform.
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Mercedes M274 - Specifications at a Glance
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Minimum 12-month warranty on reconditioned and rebuilt options
Which Mercedes Models Use the M274-
| Model | Generation/Chassis | Badge(s) | Years | Link |
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M274 is documented across 0 BMW applications spanning . Registration lookup confirms the exact suffix before quotes are sent.
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Mercedes M274 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
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All pricing guidance shown here is indicative.
Fitting a Mercedes M274 typically takes 8-12 hours at £65/hr (independent specialist rate) - confirm exact labour when comparing quotes.
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Mercedes M274 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the M274, based on real-world data and verified failure patterns.
Real-world failure data and repair guidance from UK specialists.
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How to Confirm You Have the Mercedes M274
The M274 engine code (including sub-codes M274.920 and M274.921) is stamped directly onto a machined pad on the engine block, typically located near the oil filter housing or the bell housing. It is also clearly listed on your vehicle's V5C registration document under "Engine Number" and can be decoded from the full VIN. The M274.920 typically denotes the 184hp tune (C200/E200/GLC200), while the M274.921 denotes the higher-output 211hp/245hp tune (C250/E250/GLC300). **Common Confusion Warning:** Owners frequently confuse the longitudinal M274 with several other Mercedes 2.0L and 1.8L engines: - **M270:** The M270 is the transverse-mounted version of this engine, fitted to front-wheel-drive compact models (A-Class, B-Class, CLA, GLA). Fitting an M270 into a longitudinal W205 or W213 will result in severe mounting, exhaust, and wiring incompatibilities. - **M264:** The M264 is the direct successor in the W205 facelift and W213, featuring a 48V mild-hybrid system (ISG) and different engine mount points. While both are 2.0L longitudinal turbos, they are not direct swap replacements without extensive ECU and wiring modifications. - **M271:** The older 1.8L turbo/supercharged engine. While it shares some architectural DNA, the M271 has different displacement, mounting, and engine management systems.
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The 1.8L turbocharged predecessor it replaced, which featured older port-injection or early direct-injection setups and suffered from different timing chain tensioner vulnerabilities.
The direct 2.0L longitudinal successor introduced from 2017, which added a 48V mild-hybrid system (ISG) and revised engine mounts, making it physically incompatible as a direct swap despite the shared displacement.
The transverse-mounted variant of this engine family, fitted to front-wheel-drive compact models like the A-Class and B-Class; owners of FWD platforms should check this page instead, as the M270 is not a direct physical swap.
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Buying a Replacement Mercedes M274 - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
Reconditioned:
Rebuilt:
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Vehicle Value Note:
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Engines Related to the Mercedes M274
Explore engines that are closely related to the Mercedes M274, including its predecessor, successor, and key family variants.
M271
The 1.8L turbocharged predecessor it replaced, which featured older port-injection or early direct-injection setups and suffered from different timing chain tensioner vulnerabilities.
M264
The direct 2.0L longitudinal successor introduced from 2017, which added a 48V mild-hybrid system (ISG) and revised engine mounts, making it physically incompatible as a direct swap despite the shared displacement.
M270
The transverse-mounted variant of this engine family, fitted to front-wheel-drive compact models like the A-Class and B-Class; owners of FWD platforms should check this page instead, as the M270 is not a direct physical swap.
Mercedes M274Frequently Asked Questions
Question 1How much does a Mercedes M274 engine replacement cost in the UK-
A Mercedes M274 engine replacement typically costs between £3,800 and £6,500 for a reconditioned supply-only unit . Fitted costs generally add £520-£780 for independent specialist labour, and fully rebuilt units with upgraded components can reach £5,500-£8,500 supply-only.
- Fitted costs generally add £520-£780 for independent specialist labour.
- Fully rebuilt units with upgraded components can reach £5,500-£8,500 supply-only.
Question 2What is the most common failure with the Mercedes M274 engine-
The most documented failure pattern for the M274 is timing chain stretch and tensioner wear on early production models (2012-2015), typically occurring between 50,000 and 90,000 miles. Early warning signs include a metallic rattle on cold starts and camshaft correlation fault codes, and additionally, PCV valve diaphragm failure is common, leading to oil consumption and intake tract contamination.
- Early warning signs include a metallic rattle on cold starts and camshaft correlation fault codes.
- Additionally, PCV valve diaphragm failure is common, leading to oil consumption and intake tract contamination.
Question 3Which Mercedes models use the M274 engine-
The M274 is fitted to Mercedes-Benz longitudinal rear-wheel-drive and 4MATIC models from 2012 to 2020, including the C-Class (W204 late/W205), E-Class (W213), GLC (X253), and S-Class (W222 hybrid). It powers badges ranging from the C200 and C250 to the E300 and GLC300, and you should always verify your exact fitment via registration lookup before ordering parts.
- It powers badges ranging from the C200 and C250 to the E300 and GLC300.
- You should always verify your exact fitment via registration lookup before ordering parts.
Question 4Should I buy a used or reconditioned Mercedes M274 engine-
A reconditioned Mercedes M274 is strongly recommended over a used unit due to the well-documented timing chain tensioner and PCV diaphragm failure risks. Used units carry a high probability of inheriting the same latent wear unless accompanied by stamped proof of a full chain kit replacement, whereas a proper reconditioned M274 includes a new timing chain, updated tensioner, and a fresh PCV valve cover as standard.
- Used units carry a high probability of inheriting the same latent wear unless accompanied by stamped proof of a full chain kit replacement.
- A proper reconditioned M274 includes a new timing chain, updated tensioner, and a fresh PCV valve cover as standard.
Question 5How do I know if my car has the M274 and not the M270 or M264-
The M274 engine code is stamped on the engine block near the oil filter housing and is listed on your V5C registration document. It is commonly confused with the transverse M270 (FWD models) or the newer M264 (48V mild-hybrid models), but fitting an M270 or M264 will result in severe mounting, exhaust, and wiring loom incompatibilities, making like-for-like replacement essential.
- It is commonly confused with the transverse M270 (FWD models) or the newer M264 (48V mild-hybrid models).
- Fitting an M270 or M264 will result in severe mounting, exhaust, and wiring loom incompatibilities, making like-for-like replacement essential.
Compare Mercedes M274 Engine Prices Today
Get a free, no-obligation comparison for your exact Mercedes M274 engine code. Our registration lookup confirms your precise fitment before any quotes are sent, ensuring you receive accurate pricing for your specific vehicle. With reconditioned M274 units starting from an estimated £3,800, comparing specialist quotes takes just two minutes and could save you hundreds on your replacement.
Vetted UK specialists for M274 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide delivery plus supply and fit availability
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
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