Scenic Battery Sensor Issue

Hi, I've got a 2006 Renault Scenic diesel and the battery seems to be failing early. It's weak on starting, especially on cold mornings. The headlights and interior lights flicker. My multimeter shows the voltage fluctuating, not the expected 12.6V at rest, and dropping a lot under load. Could this be a faulty battery sensor misreporting battery health and messing up the charging? I've checked the connections and they're good.

4 comment(s)

I had a similar problem with my Scenic. Weak starts, lights dimming… drove me nuts! Didn't check the voltage, but the symptoms sound the same. Have you looked at the sensor itself?

I've visually inspected the sensor, but I can't tell if it's working right. Can you tell me more about your experience? Did you find a way to confirm the sensor was bad, or did you just replace it based on the symptoms? Any info would be great.

I didn't dive as deep as you did with the multimeter. I just took it to a workshop. They ran diagnostics and confirmed it was a faulty battery sensor. New sensor, problem solved.

Thanks for sharing! I thought so. I'll get a new sensor and hopefully that fixes it. The local shop quoted 315€ for the sensor and installation. That's the price of fixing it I guess! Thanks again; your advice helped me figure out what to do.

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