Great Wall Reviews

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.

In order to find the remedy, you first need to know the cause. On this vehicle, the P0300 code indicates a misfire in one or more of the cylinders of the engine. In the majority of cases, this can be traced to a faulty coil, high-tension lead, spark plug, computer or even the fuel system. The warning shows that one of the cylinders is not firing as cleanly as it should be, so those are the basic thigs to start with. The problem could be as simple as moisture inside one of the coils or its fittings, or even a simple dodgy spark plug. If that’s the case, replace all of them, rather than just the one that’s faulty, as the rest are also likely to be getting towards the end of their life.