It's because of where you bought your car. The ones sold in the US are required to support one of a certain set of standard OBD-II protocols (mostly because that's necessary for emissions testing). The 370's sold in other countries don't always do so. I know we've had examples here in the past of 370's from the middle east and/or japan that didn't speak the "normal" US OBD-II protocols. Some devices can talk to them, some can't, depends on the devices' support for strange/abnormal protocols (from the normal US point of view).
Sorry I don't have a ton of detail on the subject. What was the country of origin? Was it imported as a one-off to Singapore from elsewhere?
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