anniweber2
S90 Diesel Battery Drain
Summary of the thread
A 2019 Volvo S90 diesel is experiencing battery drainage, weak flickering lights, and engine starting issues, accompanied by an error message on the speedometer. The potential causes include a faulty battery sensor or alternator issues. The suggested solution is to have the vehicle professionally checked, leading to the discovery and replacement of a defective battery sensor, resolving the problem.
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4 comment(s)
anniweber2 (community.author)
Thanks, I've checked the terminals and they're clean and secure. How do I test the alternator effectively? I don't have specialized tools.
dennis_crystal2
Without proper tools, testing the alternator yourself might be tricky and risky. Based on your symptoms, especially the error message, stored error, and that it is a modern vehicle, the battery sensor may be faulty. I'd really recommend getting it checked out professionally at a workshop to avoid damaging anything further. Better safe than sorry!
anniweber2 (community.author)
I took it to a workshop as you suggested. They found a defective battery sensor and replaced it. The repair cost 315€. The issue is resolved. Thanks for the help.
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VOLVO
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S90
dennis_crystal2
That sounds frustrating! I had something similar with my old car. Weak battery symptoms can be a real pain. Have you checked the battery terminals to make sure they're clean and properly connected? Maybe test the alternator to see if it's charging the battery correctly?