O2 sensor related I'd bet.
Lack of O2 sensor switch, rich; lean;
Upstream O2 circuit fault
Downstream circuit fault
I've replaced all the sensors, tried the extenders and still the same problem.
Anti theft light flashing rapidly and gauges flicker once in awhile. Found some melted wires for the trailer control module and repaired but still can't communicate with all this modules. It has u0100…