Possible engine was steam cleaned as was spotless, spark plugs unknown can’t see anything in the bills history, is camshaft adjustments a costly job not that it matters as I can still take back the car and has a 6 month warranty, as the dealer is 4 hours away they will foot the bill at my independent garage, I was just worried that after I put in the injector cleaner in the light stayed on and I had made a bad move