Reply To: Determining mechanical repair required programmatically from DTCs, freeze frame

[Richard Kirshy]

If your having a combination of codes, best to determine if they are some how connected to each other or separate.
Most ( if not all) codes can be looked up on the internet.
Even many by specific MFG’s.
In many cases a code will point you in a direction say a fault with a O2 heater circuit .
In that case the O2 heater may be faulty also the wiring, connector, ECM connection or the ECM itself maybe at fault.
A complete diagnostic will point out the issue to prevent firing the parts cannon and wasting $$$.