Mercedes Washer Fluid Warning and System Failure

My 2012 Mercedes E Klasse diesel keeps showing a 'Washer fluid low' warning, even when the reservoir is full. The windshield washer system isn't working either, and the error memory shows a fault. I've made sure the wiper water level is correct. Any ideas what could be causing this?

4 comment(s)

I had the same thing happen with my old BMW. The warning light stayed on even with a full reservoir. It turned out to be a bad sensor in the washer fluid tank. Have you looked at the sensor or the washer motor? Those can cause problems too.

Thanks for the idea. I haven't checked the sensor specifically. How would I test if the sensor is faulty? Should I just replace it, or are there tests I should do first?

I just took my car to a shop because I didn't have the tools to check it myself. They found a bad sensor and replaced it quickly. If you're not comfortable doing it yourself, a professional might be the way to go.

Thanks for the help. I checked the washer motor, and it seemed to be the problem. I replaced it for about 25€, and now the windshield cleaning system works, and the warning light is gone. Thanks again!

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