mary_dragon85
Mercedes B Klasse Hybrid Check Engine Light and Fuel Consumption
Summary of the thread
A 2020 Mercedes B Klasse hybrid experienced an intermittent check engine light and increased fuel consumption at 212,740 km. The suspected cause was an aging O2 sensor or a connection issue, potentially affecting the air-fuel ratio and catalytic converter. After checking and cleaning a loose connection, the error was resolved, and fuel consumption returned to normal.
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4 comment(s)
mary_dragon85 (community.author)
Yes fuel efficiency is worse I haven't checked the connections yet but I plan to Should that be my first step Did you replace your O2 sensor or was it just a connection
willieis28
Mine needed a new O2 sensor eventually Check the connections first If that doesn't fix it get it checked professionally Better safe than sorry with the catalytic converter
mary_dragon85 (community.author)
Thanks for the advice It was a loose connection like you thought I cleaned it and the error is gone Fuel consumption seems normal now Thanks
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MERCEDES
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BKLASSE
willieis28
That sounds familiar Was your fuel efficiency noticeably worse Did you check the O2 sensor connections before the quote