If I may ask some questions on these units
1. Can they erase all fault codes?
2. Does all blue tooth units work with all OBD2 software apps or do you purchase aeach unit with it's software?
3. Where can I buy one (that can erase fault codes)?
4. How expensive are they?
there are an astonishing array of these tools, which can do all sorts of things.
the cheaper ones, like the bluetooth ones, can read and erase most codes.
bluetooth apps are available for free, or for a charge. presumably the free versions have less functionality.
they are available on takealot, as well as some other specialist online suppliers. prices can range from +r20,000 for pro versions, to around r500 for the bluetooth ones.
i plugged in the unit i borrowed from ivman, paired it with my phone and ran obd doctor free version.
came up with a faulty temperature sensor reading (as i expected from reading citroen forums).
i cleared the error, and the car started & ran straight away. however the fan came on immediately, indicating that the sensor is giving a false reading. i will check the leads to the sensor tomorrow after i read up a bit more on where to find it, and if that doesn't sort the issue the owner will have to have the sensor replaced.
now that i have seen how it works, i will definitely buy one for myself.