Good morning!
Really hope somebody can help me on this one:
A while ago i had a bad missfire on my 07 Escalade, followed by a flashing MIL. Searching the problem i found two badly dammaged spark plug wires. Guess some martens were hungry...
A few days later i got a permanent MIL with DTC P0420, pointing to catalytic converter problems... even more
I replaced the wires, deleted the DTC, but it came back a few days later (after the ECU ran all the tests a few times to find out something isn´t right)
I think the missfire lead to too much fuel in the converters, destroying one or both of them, giving me the P0420.
Does anybody has an idea how to use HPTuners to find out if one of the converters is bad? What PID´s would be best to use (i guess all O2 Sensors should be scanned...) and what i have to expect to see if something is wrong with a cat?
ANY help is highly appreciated!
Thanks and have a nice days!
Jochen