Interesting you ask if the tow-bar electrics needed a T4 session. I’ve just fitted a tow bar & 7 pin electrics for a cycle carrier. I bought the loom from Trail-Tec in Germany, a bit expensive but well made a fits with a little adjustment as it’s primarily a BMW loom and a lhd one too! The control box is a BMW part, and I’ve no bulb error messages. One thing, it is supposed to disable the parking sensors when the tow bar is being used. It doesn’t do that, get a consistent ‘beep’ from them when cycle carrier is attached. Now I fitted the parking sensors years ago with the genuine Rover kit, but it never shows up on any T4 sessions. Do you think that’s why the tow bar electrics module doesn’t disable the sensors as the car doesn’t register them being fitted? On a slightly different note, I seem to remember reading somewhere if the sensors are fitted and you have a tow bar the car recognises this and adjusts the signal from the sensors to compensate for the extra length from the tow bar?
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