mats_koch74

Mercedes ML washer fluid warning light problem

My 2006 Mercedes ML with a diesel engine shows a persistent 'Washer Fluid Low' warning despite a full reservoir and a non-functional windshield washer system. The error memory contains the relevant fault code. I've checked the fluid level sensor and wiring. Has anyone seen this sensor issue, and what diagnostics do you recommend?

4 comment(s)

I had a similar problem with my ML; the windshield washer stopped working and the warning light was on. Did you check the pump? Sometimes it gets clogged or just fails. Also, have you tried cleaning the fluid level sensor? It might be covered in debris.

Thanks for the suggestion. Where is the pump, and how hard is it to reach? When you say 'cleaning' the sensor, do you mean wiping it, or is there more to it? I want to avoid replacing parts I don't need to.

The pump is usually on the washer fluid reservoir. Getting to it can be tricky, depending on the model, but it's usually behind the wheel well liner. For the sensor, I meant wiping it down. If that doesn't work, it's likely faulty. My sensor was the problem. I'd suggest a workshop; they'll find the issue fast.

I appreciate it. I removed the sensor, cleaned it well, and tested it with a multimeter. It was faulty. A new sensor was 25€ and fixed it. The light is off, and the washer works. Thanks for the help.

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