OK, so my DPF light came on and then my engine light. My over heating light flashed a couple of times but went straight off. I took it to two garages and neither seem to know what todo and guessing. Rather than actually diognosis. My car drives completely normal, no smoke, noises. I've been told my dpf isn't blocked and only has 5g of soot in it. It just can't regen because it can't get to the right temp. Diognostics say one thermostat is saying - 40. So not showing or getting to the right temp. My oil is not contaminated and my coolant is the normal colour but there is soot on the sides of the coolant tank wall. Also my car heating has stopped working and is it connected. Any help would be great. Thanks

 

Welcome to the forum..

 

Time to book it in with the factory backed techs @ your local Mazda dealer.