That's because they all depended blindly on the diagnostics tools available, none of them used their training and their commonsense until the last one suddenly put his brains to good use and trained me to watch for signs and that's how he was certain about the last successful action that solved the issue forever and without much expense. I love our car because it's such a hardy one, I'm a cautious but terrible driver and always rushing around but thankfully I have always been extra safe thanks to the car's sturdy features.