There are a couple of issues here. The first is that your mechanic may not have the correct scanning tool to be able to interrogate the car’s on-board computer to check for fault codes. And without the correct one, you won’t get far down that track. However, it’s worth following that route as it’s the best, most efficient way to find out what’s really going on inside the car.

Ironically, the same scanning tool required will probably also be able to turn the transmission warning light off. But turning the light off is not the solution; you need to know what triggered the warning in the first place and attend to that. Otherwise the light will keep cropping up, regardless of how often you turn it off.

Continuing to drive with a warning light illuminated risks doing more damage to the vehicle in the long run. Something is not right in your car’s driveline and the car knows it. But you’ll need the right mechanic with the right tools to be able to know what the fault is and how to fix it.

Sometimes the DPF (Diesel Particulate Filter) can become so blocked up that it’s impossible for the vehicle’s onboard systems to clean it. If that’s the case, either manual cleaning or a completely new DPF unit might be required.

A diesel specialist should be able to figure this one out. Until then, you’re stuck with limp-home mode as the vehicle should not be operated without a functioning emissions system, of which the DPF is a crucial part.

The failure to load the sensors is probably a centralised computer problem, since it’s more than one sensor (it would be an amazing coincidence if three sensors died at once). Either the Bluetooth connection is iffy, or there’s a software problem with reading what the sensors are saying.

I’m unsure how Great Wall can call the tyre-pressure sensor monitoring system a consumable. Yes, things like brake pads, tyres and batteries are considered consumables and not covered by a new-car warranty, but the tyre pressure monitoring system should last the life of the vehicle and is an important safety feature. I’d be ignoring the dealer and talking directly to GWM’s Australian customer service department and asking the tough questions. Australian consumer law is pretty clear on matter such as this one.