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majamayer1

Mercedes S Klasse Diesel Coolant Issue Resolved

My 2017 Mercedes S Klasse diesel engine has a coolant problem The coolant level dropped and the check engine light is on Diagnostics show an error I'm worried about overheating Is it a radiator cap or a coolant leak maybe radiator hoses or even a head gasket

Summary of the thread

A 2017 Mercedes S Klasse diesel engine experienced a coolant issue, with the coolant level dropping and the check engine light activating. The problem was suspected to be related to the radiator cap, coolant leak, radiator hoses, or possibly a head gasket. However, it was resolved by addressing a corroded or damaged coolant sensor cable and plug located on the lower part of the radiator. The repair cost was 95€, and it was confirmed that the issue was not as severe as a head gasket problem.

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4 comment(s)

pia_krause2

I had something similar with my S Klasse diesel Check the coolant sensor cable and plug They can get corroded or damaged

majamayer1 (community.author)

Thanks for the quick reply Can you tell me where the coolant sensor cable and plug are located Was your error message the same as mine I want to check it out before doing anything major

pia_krause2

It's on the lower part of the radiator, near where the radiator hoses connect The error was similar enough Still, get it checked, could be a leak It's best to take it to a workshop

majamayer1 (community.author)

I appreciate your help The problem was a bad cable/plug connection like you said The repair was 95€ I'm glad it wasn't a head gasket Thank you again

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MERCEDES

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SKLASSE