franziska_richter3
Mercedes B Klasse Diesel Running Lean
Summary of the thread
A 2023 Mercedes B Klasse diesel is experiencing lean running conditions at 97,120 km, leading to reduced power, a check engine light, rough running, and jerking during acceleration. The initial suspicion was injector issues, but other potential causes like a defective mass air flow sensor or malfunctioning EGR valve were considered. After a diagnostic process, it was confirmed that the injectors were the problem, and replacing them resolved the issue.
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4 comment(s)
franziska_richter3 (community.author)
That's interesting, thanks. The spark plugs are new. How did you pinpoint the mass air flow sensor on your Skoda?
antoniafire1
It was a process of elimination. The check engine light illuminated, prompting a diagnostic scan that revealed lean running codes. After verifying fuel pressure and injector functionality, the mass air flow sensor was the next logical suspect. Its readings were erratic when observed via live data. Think of it as a detective solving a case. Given the mileage on your Mercedes, and the potential impact on the catalytic converter, I'd advise a thorough diagnostic check at a reputable workshop. It's better to be safe than sorry.
franziska_richter3 (community.author)
I appreciate the advice. I took it to the shop, and you were right. It was the injectors. I replaced them, and the car is running perfectly now. Total cost 515€. Thanks again for your help!
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MERCEDES
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BKLASSE
antoniafire1
The symptoms you describe do indicate a lean running condition. Before replacing injectors, consider other potential causes. A defective mass air flow sensor can provide incorrect readings, leading the engine control unit to reduce fuel delivery. A malfunctioning EGR valve could introduce excessive exhaust gas into the intake, leaning out the mixture. Have you inspected the spark plugs for signs of abnormal combustion? It's like diagnosing a heart murmur – you wouldn't immediately schedule open-heart surgery without first checking blood pressure and cholesterol levels. I experienced similar issues with a Skoda Octavia, and it turned out to be a faulty mass air flow sensor.