KNOWN FAULTS · Mercedes-Benz
Mercedes-Benz Clase A (W177) A 200 d / 220 d (OM654) common problems.
2018–2026 · Diesel
Sources are not verified in real time and no entry confirms that your car is affected.
3 known faults with sources
OM654/OM656 AdBlue, DPF and EGRAdBlue / DPF / EGR
- Engine / equipment
- OM654 2.0 and OM656 3.0 diesel (C, E, S, GLC, GLE, GLS, G-Class from 2016)
- Period mentioned
- 2016–2026
- Symptoms
- AdBlue or emissions warnings with a start countdown; particulate filter warning; power loss or rough idle from a dirty EGR.
- Possible cause described
- These are robust engines; faults concentrate in the emissions system. The AdBlue system (injector, NOx sensors and SCR catalyst) sometimes fails, especially in the cold, and the particulate filter and EGR foul if the car mostly does short trips.
- Check for the garage
- Read AdBlue and NOx sensor codes with Xentry, check the particulate filter regeneration history and how the car is used (short trips).
- Cost cited in the source
- AdBlue system: approx. €500–1,200; particulate filter: €1,000–2,000A rough figure from the original database, not an up-to-date quote.
Mileage cited in the database: from 100,000 km. This is not a maintenance interval and does not predict a failure.
Sources from the original database
View full entryApplies if: Weak points of this model from inspections, breakdown statistics and recalls; anything specific to one engine is stated in the sheet.
Campaigns and weak points of the A-Class W177Known weak points
- Engine / equipment
- Mercedes A-Class W177 (petrol, diesel, plug-in hybrid and AMG)
- Period mentioned
- 2018 onwards
- Symptoms
- On the M282, sometimes higher oil consumption (especially with non-approved oil) and some direct-injection carbon; a front lip that scrapes, a noisy air conditioning and an abrupt lane-change assistant.
- Possible cause described
- Many recalls: eCall sending a wrong position, mis-coded Multibeam headlamps, swarf in the ABS/ESP unit, the rear backrest, brake-fluid loss with the multi-link axle, the brake pedal, airbag mounting, air conditioning with fire risk and too little gearbox oil (possible loss of drive).
- Check for the garage
- Check every campaign by VIN; use Mercedes-approved oil.
- Cost cited in the source
- No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.
Sources from the original database
View full entryApplies if: US bulletin (XENTRY LI46.10-P-078012) for Mercedes-Benz cars with a capacitive steering wheel (code 266) built from 2020; in Europe, ask the dealer.
Assist systems not available messages caused by a steering wheel hands-on detection fault (Mercedes-Benz from 2020)Driver assistance
- Engine / equipment
- Mercedes-Benz with a capacitive steering wheel (code 266)
- Period mentioned
- Built from 2020
- Symptoms
- Messages on the cluster: "Active Emergency Stop Assist not available", "Active Lane Keeping Assist not available" or "Active steering assist not available".
- Possible cause described
- The steering wheel hands-on detection fails: the detection mat, its control unit, the contacts or the wiring. Mercedes-Benz releases new software and SCN coding for the HOSWD control unit (note LI46.10-P-078012).
- Check for the garage
- Ask the garage to apply note LI46.10-P-078012: do not replace the HOSWD control unit, update its software and check the steering wheel contacts, wires and ground connections.
- Cost cited in the source
- No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.