Nissan Note Battery Sensor Issue

Good day. Based on your description, the symptoms do suggest a potential issue with the battery sensor. The fluctuating lights and weak start are indicative of inconsistent power delivery, often stemming from inaccurate battery health readings. Have you checked for any error codes related to the hybrid system or battery management via an OBD-II scanner? Furthermore, could you elaborate on the 'stone' voltage drop? A specific voltage value would be beneficial in assessing the severity.

Thanks for the quick response! I don't have an OBD-II scanner myself. When I say 'stone', I mean the voltage drops from around 12.5V to maybe 9V or even lower when starting. Is that voltage drop too drastic, and is it definitely pointing to the sensor instead of the whole battery?

The voltage drop you've described is indeed substantial and outside the normal operational parameters. While a depleted battery could exhibit such behavior, the fluctuating lights further strengthen the likelihood of a faulty battery sensor. It is advisable to take your Nissan Note to a qualified workshop for diagnostic assessment. Technicians possess the necessary tools to perform in-depth analysis of the hybrid system and definitively pinpoint the source of the problem. Replacing components without proper diagnosis may prove costly and ineffective. Please note that I have seen a similar issue in the past, but in my case, it ended up being the battery instead of the sensor. However, in your case, the sensor seems to be the more likely culprit.

Thanks a lot for your detailed advice! I took it to the workshop, and you were right - it was the battery sensor! They replaced it, and now everything is running smoothly again. The total repair cost was around 315€. I really appreciate your help!