
Reading SOS backup battery SOH with cheap Bluetooth obd2 device and car scanner app?
I've got the dreaded SOS error. Potentially caused by the 3.8 software update resetting the values of the SOS battery health - or so I understand.
Dealer has just said I need a new SOS battery which will cost £420 fitted, but I'm not sure I believe it.
I've heard that with the expensive obdeleven devices (https://obdeleven.com) you can read the SOS backup battery SOH and often it reads as fine despite the error saying it needs replacing.
I have a cheap Bluetooth OBD2 device and am using the car scanner app. But I can't seem to fnd the SOS battery SOH, I know I need to be looking in control unit 75 (telematics). All I can find is the error codes.
Do I need to pay £££ for the obdeleven device? I understand I can also use it to reset the learned values of the SOS battery.
But I was hoping to prove to the dealership that my SOS battery was actually OK without having to spend £100 on an obdeleven device.
Many thanks