Mercedes-Benz B-Klasse W247
Weaknesses, engine ratings and buying advice
The third B-Class rides on the MFA2 platform, sharing technology with the W177 A-Class, GLA H247, and GLB X247. If you find the A-Class too cramped but don't want an SUV, the W247 offers the best interior space in Mercedes' compact range.
The M282 1.3L turbo is the entry engine: 80 to 120 kW in B 160 through B 200. A Renault cooperation engine that does its job but occasionally runs rough on cold starts. The 160 kW version in the B 250 e is a plug-in hybrid. The larger M260 2.0L at 140 to 165 kW in B 220 and B 250 is the noticeably more refined engine with real power surplus.
Diesels include the OM608 1.5L (70–85 kW) as entry and the OM654 2.0L (110–140 kW) as premium diesel. The OM654 is one of the best diesel engines of its generation — quiet, efficient, durable. The OM608 is solid too but often at its power limit in the B-Class.
The 7G-DCT and 8G-DCT serve as automatics — the 8-speed in the more powerful models is the better choice. MBUX infotainment is modern, but software bugs in early model years (2019-2020) were common — ensure the software is up to date.
Rust is not a concern for 2018+ builds. Brakes on heavy plug-in variants wear faster than expected.
Test-drive checklist: Test MBUX thoroughly — does everything respond smoothly or does the system lag? Test DCT in city traffic for judder. For plug-in: have the HV battery health checked — below 80% SOH is a warning.
2026 market: Between $19,800 and $35,200 for examples with 20,000–50,000 miles.
Insider pick: B 200 d (OM654, 110 kW) — the confident diesel daily-driver compromise.
190 PS
B 220 d · Diesel
Strongest B-Class Diesel
Decent109–163 PS
1.3L Turbo Benzin
4 weaknesses
Good Choice120–204 PS
2.1L Diesel Diesel
7 weaknesses
Stay Away!Generations
Engine Overview
The Mercedes-Benz B-Klasse W247 is available with 10 engine variants — from 75 to 286 hp.
Evolution of the Renault K9K diesel with SCR catalyst for Euro 6 compliance. Economical and clean, but still with limited power reserves. The timing belt remains the central issue: Mercedes quotes 200,000 km, Renault specifies 120,000 km — interference engine with total loss risk on failure. Turbo shaft seal can leak oil early, noticeable as blue smoke. EGR valve and DPF are sensitive to short-trip use. Only available with automatic transmission. Check belt age and service records before purchase — longevity depends entirely on correct timing belt maintenance.
- !! Timing belt change critical from 120,000 km
The OM608 (Renault K9K base) uses a timing belt. Mercedes specifies 200,000 km change interval; Renault prescribes 120,000 km for the same engine. A snap causes immediate total damage on this interference engine.
Symptoms: No noticeable warning before snap; beforehand: faint squealing, occasionally starting difficulties - !! Increased oil consumption / turbo shaft seal from 100,000 km
The Renault-based OM608 1.5 CDI sometimes shows increased oil consumption from early on due to a leaking turbocharger shaft seal. Oil mist in the intake tract behind the turbo.
Symptoms: Dropping oil level, oil mist or blue smoke from exhaust, oil in air filter housing behind turbo - !! EGR valve contamination from 80,000 km
As a Renault K9K derivative, the OM608 shares the known EGR valve weakness. With frequent short-trip use, soot particles accumulate, the valve seizes and triggers limp mode.
Symptoms: Engine warning light, power loss, limp mode at around 3000 rpm, increased fuel consumption
+ 1 more engine weaknesses + vehicle weaknesses
Evolution of the Renault K9K diesel with SCR catalyst for Euro 6 compliance. Economical and clean, but still with limited power reserves. The timing belt remains the central issue: Mercedes quotes 200,000 km, Renault specifies 120,000 km — interference engine with total loss risk on failure. Turbo shaft seal can leak oil early, noticeable as blue smoke. EGR valve and DPF are sensitive to short-trip use. Only available with automatic transmission. Check belt age and service records before purchase — longevity depends entirely on correct timing belt maintenance.
- !! Timing belt change critical from 120,000 km
The OM608 (Renault K9K base) uses a timing belt. Mercedes specifies 200,000 km change interval; Renault prescribes 120,000 km for the same engine. A snap causes immediate total damage on this interference engine.
Symptoms: No noticeable warning before snap; beforehand: faint squealing, occasionally starting difficulties - !! Increased oil consumption / turbo shaft seal from 100,000 km
The Renault-based OM608 1.5 CDI sometimes shows increased oil consumption from early on due to a leaking turbocharger shaft seal. Oil mist in the intake tract behind the turbo.
Symptoms: Dropping oil level, oil mist or blue smoke from exhaust, oil in air filter housing behind turbo - !! EGR valve contamination from 80,000 km
As a Renault K9K derivative, the OM608 shares the known EGR valve weakness. With frequent short-trip use, soot particles accumulate, the valve seizes and triggers limp mode.
Symptoms: Engine warning light, power loss, limp mode at around 3000 rpm, increased fuel consumption
+ 1 more engine weaknesses + vehicle weaknesses
Completely new aluminium diesel with NANOSLIDE coating and integrated particulate filter. Initially marketed as the future of diesel, but significant issues have emerged: rocker arms and camshafts wear prematurely (TSB GI05.30-P-070181); Mercedes improved the parts from engine serial number 80278367 (October 2018). Major recalls include the timing chain recall and coolant pump recall (fire risk, ~800,000 vehicles affected). Also implicated in emissions scandal via illegal thermal window defeat device (LG Stuttgart 2020). Shorten oil change intervals to max 15,000 km — extended intervals accelerate rocker arm wear.
- !! Rocker Arm and Camshaft Wear from 80,000 km
Known weak point: the narrow camshaft lobes and rocker arms in the OM654 wear prematurely due to inadequate lubrication. Mercedes issued TSBs.
Symptoms: Ticking or knocking from engine bay, misfires, rough running, engine warning light - !! Electric Coolant Pump Leaking — Recall
Over 800,000 Mercedes diesel vehicles with OM654/OM656 were recalled due to a leaking electric coolant pump. Coolant loss can lead to overheating.
Symptoms: Coolant loss, overheating warning, coolant warning light, engine temperature rises - !! NOx Sensor Defective — AdBlue Fault and Start Inhibit from 90,000 km
NOx sensors wear out from soot particles and deliver erroneous readings. Consequence: incorrect AdBlue injection, CEL illumination; if unaddressed, an engine start inhibit may follow. Both sensors can be affected.
Symptoms: CEL, AdBlue warning, fault code P20EE or P204F, message 'No start after X km', rough idle
+ 9 more engine weaknesses + vehicle weaknesses
Completely new aluminium diesel with NANOSLIDE coating and integrated particulate filter. Initially marketed as the future of diesel, but significant issues have emerged: rocker arms and camshafts wear prematurely (TSB GI05.30-P-070181); Mercedes improved the parts from engine serial number 80278367 (October 2018). Major recalls include the timing chain recall and coolant pump recall (fire risk, ~800,000 vehicles affected). Also implicated in emissions scandal via illegal thermal window defeat device (LG Stuttgart 2020). Shorten oil change intervals to max 15,000 km — extended intervals accelerate rocker arm wear.
- !! Rocker Arm and Camshaft Wear from 80,000 km
Known weak point: the narrow camshaft lobes and rocker arms in the OM654 wear prematurely due to inadequate lubrication. Mercedes issued TSBs.
Symptoms: Ticking or knocking from engine bay, misfires, rough running, engine warning light - !! Electric Coolant Pump Leaking — Recall
Over 800,000 Mercedes diesel vehicles with OM654/OM656 were recalled due to a leaking electric coolant pump. Coolant loss can lead to overheating.
Symptoms: Coolant loss, overheating warning, coolant warning light, engine temperature rises - !! NOx Sensor Defective — AdBlue Fault and Start Inhibit from 90,000 km
NOx sensors wear out from soot particles and deliver erroneous readings. Consequence: incorrect AdBlue injection, CEL illumination; if unaddressed, an engine start inhibit may follow. Both sensors can be affected.
Symptoms: CEL, AdBlue warning, fault code P20EE or P204F, message 'No start after X km', rough idle
+ 9 more engine weaknesses + vehicle weaknesses
Co-developed with Renault (related to H5Ht 1.3). Cylinder bore with NANOSLIDE coating for low friction. Small displacement turbo engine — some units show early oil consumption from porous oil scraper rings under sustained high load. Direct injection without port injection causes carbon deposits from ~60,000 km. Thermostat straightforward and inexpensive to replace. Turbocharger boost pressure loss from around 80,000 km. Compact and economical, capable of 160,000+ km for moderate daily use.
- !! Increased oil consumption from piston ring wear from 60,000 km
Some M282 engines show progressive oil consumption from low mileage. Cause: defective oil rings or pistons. Direct injection washes oil off the cylinder wall.
Symptoms: Regular oil top-ups required, no visible leaks, no smoke from exhaust - !! Boost pressure loss from turbo or charge air hose from 120,000 km
The M282 turbocharger can lose power at higher mileage from bearing wear or leaking charge air pipes. The wastegate actuator can deliver incorrect signals.
Symptoms: Power drop at full throttle, whistling in the engine bay, boost pressure too low warning (P0299) - ! Thermostat problems from 80,000 km
The M282 1.3T (co-developed with Renault) shows similar thermostat problems to the predecessor M270 family. A simple replacement often does not resolve the issue permanently.
Symptoms: Engine does not reach operating temperature reliably, temperature gauge fluctuates, increased fuel consumption
+ 1 more engine weaknesses + vehicle weaknesses
Co-developed with Renault (related to H5Ht 1.3). Cylinder bore with NANOSLIDE coating for low friction. Small displacement turbo engine — some units show early oil consumption from porous oil scraper rings under sustained high load. Direct injection without port injection causes carbon deposits from ~60,000 km. Thermostat straightforward and inexpensive to replace. Turbocharger boost pressure loss from around 80,000 km. Compact and economical, capable of 160,000+ km for moderate daily use.
- !! Increased oil consumption from piston ring wear from 60,000 km
Some M282 engines show progressive oil consumption from low mileage. Cause: defective oil rings or pistons. Direct injection washes oil off the cylinder wall.
Symptoms: Regular oil top-ups required, no visible leaks, no smoke from exhaust - !! Boost pressure loss from turbo or charge air hose from 120,000 km
The M282 turbocharger can lose power at higher mileage from bearing wear or leaking charge air pipes. The wastegate actuator can deliver incorrect signals.
Symptoms: Power drop at full throttle, whistling in the engine bay, boost pressure too low warning (P0299) - ! Thermostat problems from 80,000 km
The M282 1.3T (co-developed with Renault) shows similar thermostat problems to the predecessor M270 family. A simple replacement often does not resolve the issue permanently.
Symptoms: Engine does not reach operating temperature reliably, temperature gauge fluctuates, increased fuel consumption
+ 1 more engine weaknesses + vehicle weaknesses
Co-developed with Renault (related to H5Ht 1.3). Cylinder bore with NANOSLIDE coating for low friction. Small displacement turbo engine — some units show early oil consumption from porous oil scraper rings under sustained high load. Direct injection without port injection causes carbon deposits from ~60,000 km. Thermostat straightforward and inexpensive to replace. Turbocharger boost pressure loss from around 80,000 km. Compact and economical, capable of 160,000+ km for moderate daily use.
- !! Increased oil consumption from piston ring wear from 60,000 km
Some M282 engines show progressive oil consumption from low mileage. Cause: defective oil rings or pistons. Direct injection washes oil off the cylinder wall.
Symptoms: Regular oil top-ups required, no visible leaks, no smoke from exhaust - !! Boost pressure loss from turbo or charge air hose from 120,000 km
The M282 turbocharger can lose power at higher mileage from bearing wear or leaking charge air pipes. The wastegate actuator can deliver incorrect signals.
Symptoms: Power drop at full throttle, whistling in the engine bay, boost pressure too low warning (P0299) - ! Thermostat problems from 80,000 km
The M282 1.3T (co-developed with Renault) shows similar thermostat problems to the predecessor M270 family. A simple replacement often does not resolve the issue permanently.
Symptoms: Engine does not reach operating temperature reliably, temperature gauge fluctuates, increased fuel consumption
+ 1 more engine weaknesses + vehicle weaknesses
Powerful 2.0L turbo of the new MFA2 compact platform, transversely mounted. The dominant issue is exhaust valve seat wear — Mercedes issued a goodwill extended warranty (15 years / 150,000 miles, North America) for 2019–2022 models. Timing chain tensioner and oil circuit solenoid failures known. Carbon on intake valves from direct injection. Turbo wastegate actuators corrode in humid climates. Do not use Longlife oil service — 10,000 km intervals with MB 229.5.
- !! Exhaust Valve Seat Insert Wear / Cylinder Head from 60,000 km
Wear on exhaust valve seat rings and valve guides can cause unsealed combustion chambers — misfires and out-of-spec emissions. Mercedes issued a 15-year / 150,000-mile extended warranty on the cylinder head for affected A-/CLA-/GLA-/GLB-Class (2019–2022 MY) in North America.
Symptoms: Rough engine running, misfires (faults P0300–P0304), check engine light, power loss, vibration - !! Timing Chain Rattles on Cold Start from 90,000 km
On the M260 timing chain and tensioner can wear prematurely, especially with long oil change intervals. Affected vehicles show rattling on cold start.
Symptoms: Metallic rattling after cold start, check engine light, camshaft position fault codes - !! Wastegate Actuator Causes Boost Pressure Loss from 100,000 km
The wastegate actuator on the M260 can open prematurely from spring wear, leading to underboost. Diagnosis possible by pressure-testing the actuator.
Symptoms: Power deficiency under load, P0299 fault code, whistling on acceleration
+ 2 more engine weaknesses + vehicle weaknesses
Powerful 2.0L turbo of the new MFA2 compact platform, transversely mounted. The dominant issue is exhaust valve seat wear — Mercedes issued a goodwill extended warranty (15 years / 150,000 miles, North America) for 2019–2022 models. Timing chain tensioner and oil circuit solenoid failures known. Carbon on intake valves from direct injection. Turbo wastegate actuators corrode in humid climates. Do not use Longlife oil service — 10,000 km intervals with MB 229.5.
- !! Exhaust Valve Seat Insert Wear / Cylinder Head from 60,000 km
Wear on exhaust valve seat rings and valve guides can cause unsealed combustion chambers — misfires and out-of-spec emissions. Mercedes issued a 15-year / 150,000-mile extended warranty on the cylinder head for affected A-/CLA-/GLA-/GLB-Class (2019–2022 MY) in North America.
Symptoms: Rough engine running, misfires (faults P0300–P0304), check engine light, power loss, vibration - !! Timing Chain Rattles on Cold Start from 90,000 km
On the M260 timing chain and tensioner can wear prematurely, especially with long oil change intervals. Affected vehicles show rattling on cold start.
Symptoms: Metallic rattling after cold start, check engine light, camshaft position fault codes - !! Wastegate Actuator Causes Boost Pressure Loss from 100,000 km
The wastegate actuator on the M260 can open prematurely from spring wear, leading to underboost. Diagnosis possible by pressure-testing the actuator.
Symptoms: Power deficiency under load, P0299 fault code, whistling on acceleration
+ 2 more engine weaknesses + vehicle weaknesses
Co-developed with Renault (related to H5Ht 1.3). Cylinder bore with NANOSLIDE coating for low friction. Small displacement turbo engine — some units show early oil consumption from porous oil scraper rings under sustained high load. Direct injection without port injection causes carbon deposits from ~60,000 km. Thermostat straightforward and inexpensive to replace. Turbocharger boost pressure loss from around 80,000 km. Compact and economical, capable of 160,000+ km for moderate daily use.
- !! Increased oil consumption from piston ring wear from 60,000 km
Some M282 engines show progressive oil consumption from low mileage. Cause: defective oil rings or pistons. Direct injection washes oil off the cylinder wall.
Symptoms: Regular oil top-ups required, no visible leaks, no smoke from exhaust - !! Boost pressure loss from turbo or charge air hose from 120,000 km
The M282 turbocharger can lose power at higher mileage from bearing wear or leaking charge air pipes. The wastegate actuator can deliver incorrect signals.
Symptoms: Power drop at full throttle, whistling in the engine bay, boost pressure too low warning (P0299) - ! Thermostat problems from 80,000 km
The M282 1.3T (co-developed with Renault) shows similar thermostat problems to the predecessor M270 family. A simple replacement often does not resolve the issue permanently.
Symptoms: Engine does not reach operating temperature reliably, temperature gauge fluctuates, increased fuel consumption
+ 1 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Recall: Gearbox Oil Underfilled — Fire Risk On B-Class W247 with DCT gearbox (production Jan. 2018 – Mar. 2020) the gearbox may have been underfilled with oil. This can lead to drivetrain failure and increased fire risk. Symptoms: Gearbox fault warning in instrument cluster, drivetrain loss while driving, burning smell | Low | |
| Airbag mounting defect (recall 2018-2019) W247 vehicles from 2018-2019 may have airbags that detach on deployment — increased injury risk. Mercedes recall performed. | Low |
Test Reports
TÜV Report 2024
The current W247 continues the B-Class's strong MOT tradition and ranks among the class leaders at the first MOT inspections.
2023-11ADAC Breakdown Statistics 2024
The current W247 confirms the very high reliability level of the previous generation in breakdown frequency.
2024-04Alternatives
Explore more
Known Problems and Issues +
A total of 63 weaknesses have been documented for the Mercedes-Benz B-Klasse W247 (2018–2025) — 55 engine-related and 8 vehicle-related. One problem engine: OM651DE22 (2.1L Diesel). Typical issues affect Other, Suspension, Electronics, Interior. Considered reliable: M282 (1.3L Turbo).
B-Klasse (OM651DE18, 2011–2019) — Be Careful: Piezo Injector Faults (220/250 CDI), Chain Tensioner Failure with Oil Loss, Particulate Filter Blockage with Short-Trip Use. Power: 136 PS.
B-Klasse (OM607, 2013–2019) — Be Careful: Timing belt instead of chain -- maintenance obligation, Timing belt interference engine -- total loss risk, Injector failure K9K base. Power: 90–95 PS.
B-Klasse (OM607, 2013–2019) — Be Careful: Timing belt instead of chain -- maintenance obligation, Timing belt interference engine -- total loss risk, Injector failure K9K base. Power: 109–116 PS.
B-Klasse (OM651DE22, 2014–2019) — Stay Away!: Chain Tensioner Seal Leaking — Recall, Timing Chain Stretch (Simplex Chain), Piezo Injector Faults. Power: 170–177 PS.
B-Klasse (OM608, 2018–2025) — Be Careful: Timing belt change critical, Increased oil consumption / turbo shaft seal, EGR valve contamination. Power: 109–116 PS.
B-Klasse (OM654, 2018–2025) — Be Careful: Rocker Arm and Camshaft Wear, Electric Coolant Pump Leaking — Recall, NOx Sensor Defective — AdBlue Fault and Start Inhibit. Power: 150 PS.
B-Klasse (OM654, 2018–2025) — Be Careful: Rocker Arm and Camshaft Wear, Electric Coolant Pump Leaking — Recall, NOx Sensor Defective — AdBlue Fault and Start Inhibit. Power: 190 PS.
B-Klasse (OM608, 2019–2025) — Be Careful: Timing belt change critical, Increased oil consumption / turbo shaft seal, EGR valve contamination. Power: 90–95 PS.
B-Klasse (M270DE16, 2011–2019) — Be Careful: Camshaft Adjuster Solenoid Leaks — Oil in Wiring Harness, Recall — Camshaft Break (Production Defect 2015), Electric Thermostat Failure. Power: 122 PS.
B-Klasse (M270DE16, 2011–2019) — Be Careful: Camshaft Adjuster Solenoid Leaks — Oil in Wiring Harness, Recall — Camshaft Break (Production Defect 2015), Electric Thermostat Failure. Power: 156 PS.
B-Klasse (M270DE20, 2012–2019) — Be Careful: Camshaft Adjuster Solenoid Leaks — Oil in Wiring Harness, Recall — Camshaft Break (Production Defect 2015), Electric Thermostat Failure. Power: 184–190 PS.
B-Klasse (M270DE20, 2012–2019) — Be Careful: Camshaft Adjuster Solenoid Leaks — Oil in Wiring Harness, Recall — Camshaft Break (Production Defect 2015), Electric Thermostat Failure. Power: 211 PS.
B-Klasse (M270DE16, 2015–2019) — Be Careful: Camshaft Adjuster Solenoid Leaks — Oil in Wiring Harness, Recall — Camshaft Break (Production Defect 2015), Electric Thermostat Failure. Power: 102 PS.
B-Klasse (M260, 2018–2025) — Be Careful: Exhaust Valve Seat Insert Wear / Cylinder Head, Timing Chain Rattles on Cold Start, Wastegate Actuator Causes Boost Pressure Loss. Power: 184–190 PS.
B-Klasse (M260, 2018–2025) — Be Careful: Exhaust Valve Seat Insert Wear / Cylinder Head, Timing Chain Rattles on Cold Start, Wastegate Actuator Causes Boost Pressure Loss. Power: 224 PS.
What to watch out for with the Mercedes-Benz B-Klasse? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Mercedes-Benz B-Klasse W247 have? +
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Which Mercedes-Benz B-Klasse W247 engine is the most reliable? +
Which Mercedes-Benz B-Klasse W247 engine is the most fun? +
Is the Mercedes-Benz B-Klasse W247 worth buying used? +
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Last updated: February 2026 · All information without guarantee