On some RHD cars, the manner in which the OBD-II port is installed could be generously described as an "afterthought". There tends not to be sufficient clearance around it (as specified by the SAE/ISO specs) for the tool to seat completely on the socket. The problem is not the socket itself, but the surrounding trim. One way to address this is via judicious application of a Dremel tool to that trim. Because the extension cable does not need to house a circuit board, it's smaller and has fewer issues with tight-fitting, out-of-spec trim.
Another problem that isn't limited to RHD cars is that some other tools (typically cheap Chinese ones) have out-of-spec pins that can damage the female pins in the OBD socket. We've also seen cases where the female pins have been pushed back into the OBD-II socket some.
Since the connectors & pins on our interfaces, as well as the shape & size of the interfaces themselves is fully compliant with the SAE/ISO specs, if you have connection problems like that, first check whether there's anything that's preventing the interface from seating fully on the socket. If you're certain it's seating fully, then do a good, close-up inspection of the female pins in the socket.
true, works on first try (LHD)
