Mercedes-Benz B-Class diagnostics
Mercedes-Benz B-Class (2005–2026): free AI diagnosis by symptoms, fault codes or a dashboard photo — plus OBD-II reading right in the browser.
What usually goes wrong on the Mercedes-Benz B-Class
- На W245 (2005–2011) вариатор Autotronic 722.8 — типовая проблема: пробой платы гидроблока и износ конусов, коробка дёргается и теряет тягу.
- На W246 с моторами M270 1.6 turbo растягивается цепь ГРМ — шум цепи на холодную и ошибки корреляции распредвала.
- Робот 7G-DCT: подгорание сцеплений и сбои мехатроника с толчками на малых скоростях и в пробках.
- На дизельных B180/B200 CDI закоксовывается EGR и забивается сажевый фильтр при коротких поездках.
These are the model's typical weak points, not a verdict on your particular car: the AI keeps them in mind, but the diagnosis comes from your symptoms and your codes.
Fault codes that come up most often
Click a code to open the breakdown: what it means, how serious it is and what to check first.
Describe the problem
Tell the AI chat what your Mercedes-Benz B-Class is doing — noises, warning lights, behavior. It knows the model's typical weak points and asks the right follow-up questions.
Read the codes
Plug an ELM327 adapter (over USB or Bluetooth LE) into the OBD-II port and read fault codes right in the browser on the Connect adapter page — no software to install.
Get a verdict
The AI ranks the likely causes, tells you what to check first and whether it's safe to keep driving.
Problem with your Mercedes-Benz B-Class?
Describe what's happening or paste the fault codes — the AI will narrow down the cause and tell you what to check first.
Start diagnosisWhat can be read from this car
Through the OBD-II port on your Mercedes-Benz B-Class you can read engine fault codes, live sensors, readiness monitors and a freeze frame — with an ELM327 adapter, including right in the browser. If the car has a CAN bus (roughly 2008 and newer), the program additionally polls the remaining modules:
For a deeper scan of your Mercedes-Benz B-Class — all modules, live data, freeze frames — use the free Diagnost program for Windows or macOS with an ELM327 adapter.