magdalenawilliams1
Lexus LX Battery Sensor Issue
Summary of the thread
A 2009 Lexus LX diesel with low mileage was experiencing weak starts and flickering lights, particularly in the mornings. An OBD reader indicated an issue with the battery sensor, which was suspected to be the cause of the voltage irregularities. After checking the voltage readings, it was confirmed that the battery sensor was faulty. Replacing the sensor resolved the starting and flickering issues, confirming it as the root cause.
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4 comment(s)
magdalenawilliams1 (community.author)
I checked the voltage as you suggested. When off, it reads 12.1V, which seems a bit low. While running, it jumps to 13.5V, but fluctuates a bit. Is that fluctuation normal, or does it further indicate a faulty sensor?
dietereis5
12.1V is indeed low for a resting battery and fluctuating voltage while running suggests the sensor is not properly regulating the alternator's output. Seeing that the sensor error came up in the diagnostic, I'd wager replacing it is the correct path forward. It's a fairly straightforward job, but if you're not comfortable with electrics, I'd recommend taking it to a workshop.
magdalenawilliams1 (community.author)
I took your advice and had the battery sensor replaced. The workshop confirmed it was defective. The total cost was 315€, but the starting issue and flickering lights are gone now. Thanks again for pointing me in the right direction; you saved me a lot of time diagnosing!
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LEXUS
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LX
dietereis5
Flickering lights and hard starts often point to voltage issues. The error code points at the battery sensor. What voltage readings are you getting across the battery terminals when the engine is off, and while it's running? This might give us clues.