Every car mechanic has both strong and weak area in finding the cause of a problem and the solution. Thankfully we are often visited by some customers who are not particularly happy with the other mechanic’s diagnosis.
You have a diesel vehicle and don’t take it out on the freeway much? Such a driving style might cause DPF trouble. The DPF (diesel particulate filter) is a device that removes diesel particulate matter and soot from the exhaust gas of a diesel engine during combustion.