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I use the 7$ elm327 one off ebay...its the clear blue one...its worked with every single app I've tried with it and on multiple vehicles including my 04 mcs
I know for sure 2 of those are super knock offs and I hear those are hit or miss what they work with , try this . Its 7$ only and its the one I have been using with 0 connectivity issues what so ever..
I used torque , car scanner , carly and some bmw one .. all 4 sofar has worked with it.. are you using an iphone ? iPhones from my experience have trouble using the bluetooth ones and work better using the wifi connecting ones. I use an android ( note9) but I have had it working on my wife's iphone6 too though .
I tried 2 that havent worked . I could really use some suggestions on one that's been working for others.
Are you sure the units you have are Bluetooth and not WiFi? I purchased an EML327 unit from Amazon a few years back, worked great but when I went to look at a car , I left the unit in the car...SMH. I digress, I purchased another unit recently and didn't realize it was a WiFi until I tried to get it to work, it does when you set your phone up correctly. Just make sure which unit you have?
I don't see the Bluetooth emblem on those units, look them over to make sure they are Bluetooth/WiFi.