Mercedes-Benz B-Klasse W247
Weaknesses, engine ratings and buying advice
190 PS
B 220 d · Diesel
Strongest B-Class Diesel
Decent109–163 PS
1.3L Turbo Benzin
5 weaknesses
Good Choice120–204 PS
2.1L Diesel Diesel
6 weaknesses
Stay Away!Generations
Engine Overview
The Mercedes-Benz B-Klasse W247 is available with 10 engine variants — from 75 to 286 hp.
Renault-based small diesel, new generation. Economical with SCR catalyst, but still with little power reserve. Automatic only.
- !! Timing belt maintenance obligation from 120,000 km
Like its Renault counterpart, the OM608 uses a timing belt. Prescribed change every 120,000 km or 6 years -- frequently forgotten as Mercedes buyers are accustomed to timing chains.
Symptoms: No warning on snap -- sudden engine failure and severe engine damage - !! 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
+ 2 more engine weaknesses + vehicle weaknesses
Renault-based small diesel, new generation. Economical with SCR catalyst, but still with little power reserve. Automatic only.
- !! Timing belt maintenance obligation from 120,000 km
Like its Renault counterpart, the OM608 uses a timing belt. Prescribed change every 120,000 km or 6 years -- frequently forgotten as Mercedes buyers are accustomed to timing chains.
Symptoms: No warning on snap -- sudden engine failure and severe engine damage - !! 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
+ 2 more engine weaknesses + vehicle weaknesses
Completely new aluminium diesel with NANOSLIDE coating and integrated particulate filter. Noticeably quieter and cleaner than the OM651. Few typical faults known to date.
- !! 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
+ 8 more engine weaknesses + vehicle weaknesses
Completely new aluminium diesel with NANOSLIDE coating and integrated particulate filter. Noticeably quieter and cleaner than the OM651. Few typical faults known to date.
- !! 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
+ 8 more engine weaknesses + vehicle weaknesses
Joint development with Renault (H5Ht). Cylinder bore coating: NANOSLIDE. Compact and economical, but somewhat strained under high load. Also used as PHEV base (250e).
- !! Increased oil consumption from 60,000 km
Some M282 engines show early increased oil consumption from defective piston rings and oil scraper rings. The problem sometimes appears at low mileages.
Symptoms: Dropping oil level between service visits, occasionally slight blue smoke when accelerating - !! 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)
+ 2 more engine weaknesses + vehicle weaknesses
Joint development with Renault (H5Ht). Cylinder bore coating: NANOSLIDE. Compact and economical, but somewhat strained under high load. Also used as PHEV base (250e).
- !! Increased oil consumption from 60,000 km
Some M282 engines show early increased oil consumption from defective piston rings and oil scraper rings. The problem sometimes appears at low mileages.
Symptoms: Dropping oil level between service visits, occasionally slight blue smoke when accelerating - !! 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)
+ 2 more engine weaknesses + vehicle weaknesses
Joint development with Renault (H5Ht). Cylinder bore coating: NANOSLIDE. Compact and economical, but somewhat strained under high load. Also used as PHEV base (250e).
- !! Increased oil consumption from 60,000 km
Some M282 engines show early increased oil consumption from defective piston rings and oil scraper rings. The problem sometimes appears at low mileages.
Symptoms: Dropping oil level between service visits, occasionally slight blue smoke when accelerating - !! 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)
+ 2 more engine weaknesses + vehicle weaknesses
Powerful two-litre turbo from the new compact platform. 7G-DCT or 8G-DCT standard. Strong everyday engine with few known weaknesses.
- !! Exhaust Valve Seat Insert Wear / Cylinder Head from 40,000 km
Known production deficiency: exhaust valve seat inserts and valve guides wear prematurely, leading to leaking combustion chambers. Mercedes extended warranty to 15 years / 241,000 km for model years 2019–2022.
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 two-litre turbo from the new compact platform. 7G-DCT or 8G-DCT standard. Strong everyday engine with few known weaknesses.
- !! Exhaust Valve Seat Insert Wear / Cylinder Head from 40,000 km
Known production deficiency: exhaust valve seat inserts and valve guides wear prematurely, leading to leaking combustion chambers. Mercedes extended warranty to 15 years / 241,000 km for model years 2019–2022.
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
Joint development with Renault (H5Ht). Cylinder bore coating: NANOSLIDE. Compact and economical, but somewhat strained under high load. Also used as PHEV base (250e).
- !! Increased oil consumption from 60,000 km
Some M282 engines show early increased oil consumption from defective piston rings and oil scraper rings. The problem sometimes appears at low mileages.
Symptoms: Dropping oil level between service visits, occasionally slight blue smoke when accelerating - !! 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)
+ 2 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 |
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 64 weaknesses have been documented for the Mercedes-Benz B-Klasse W247 (2018–2025) — 57 engine-related and 7 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 maintenance obligation, Timing belt change critical, Increased oil consumption / turbo shaft seal. 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 maintenance obligation, Timing belt change critical, Increased oil consumption / turbo shaft seal. 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
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Last updated: February 2026 · All information without guarantee