maraphoenix15

Peugeot 806 Battery Drain

Hey, I've got a 2001 Peugeot 806 with a gasoline engine giving me grief. The battery keeps draining like crazy. I'm getting error messages on the speedometer, the lights are flickering weakly, and the error memory is storing codes related to low voltage. Starting the engine is a real struggle because the battery is so weak. I've checked the usual suspects like leaving lights on, but nothing obvious. Could a faulty battery sensor actually cause this much drain?

A 2001 Peugeot 806 with a gasoline engine is experiencing significant battery drain, leading to error messages, weak lights, and difficulty starting. The issue may be caused by a faulty battery sensor, which can create a parasitic drain by sending incorrect data and keeping systems active. It is suggested to measure the current draw to identify excessive power usage, but ultimately, taking the vehicle to a workshop for proper diagnosis and repair is recommended. The problem was confirmed to be a defective battery sensor, which was repaired, resolving the issue.

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4 comment(s)

Sounds like a real pain. A defective battery sensor can definitely cause a parasitic drain, especially if it's constantly sending incorrect data and keeping other systems active. Have you measured the current draw with the car completely off and all accessories disabled? That would help pinpoint if something is indeed pulling excessive power. Also, what's the mileage? Knowing that might give some clues as to the battery's age and lifespan.

I've got 164004 km on the clock. I haven't measured the current draw directly, but I was hoping to avoid digging that deep. Is there any way to confirm the battery sensor is the culprit without going through all that testing? Perhaps some specific diagnostic codes or sensor readings I should be looking for?

Okay, 164004 km is decent mileage; the battery's getting up there in age. While specific diagnostic codes linked directly to a 'faulty battery sensor' might be vague or non-existent, the symptoms you described are very typical. Without proper diagnostic tools, it's tricky to pinpoint the sensor definitively. Given the symptoms and your attempts to identify other causes, my suggestion would be to take it to a workshop. They can properly diagnose the sensor and the battery itself.

Alright, thanks for the confirmation. I took it to the shop, and turns out you were spot on. The battery sensor was defective and causing a constant drain. Repair cost me 315€, but at least the problem is finally solved.

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