X Klasse auxiliary battery issue resolved

I had a similar auxiliary battery problem on my X Klasse Same symptoms: error message, weak engine start, and the electronics going haywire It sounds like low voltage is the culprit Have you checked the battery's voltage with a multimeter

I did not check the voltage with a multimeter Where is the auxiliary battery located in your vehicle Do you have any advice on accessing it safely, given the complexities of modern car electronics

The auxiliary battery is usually under the passenger seat or in the engine compartment, check your manual for the exact location in your vehicle Given the symptoms and error codes, I'd recommend taking it to a workshop for a proper diagnostic check It could be a faulty battery, a problem with the charging system, or even a parasitic drain somewhere in the car electronics Best not to risk damaging anything further by trying to fix it yourself without the right equipment

Following your advice, I had my 2020 X Klasse diagnosed at a reputable workshop The problem was indeed a failing auxiliary battery The replacement and associated labor cost me 290€, as I had anticipated The error message is now gone, the engine start is strong again, and all car electronics are functioning normally Thank you again for your assistance