P0135/P0155/P0131 codes
P0135: O2 sensor heater circuit malfunction Bank 1 Front
P0155: 02 sensor heater circuit malfuntion Bank 2 Front
P0131: O2 sensor low voltage bank 1
Whats the odds both o2 sensors are bad at the same time? could it be a wire issue? just did a H/C/I swap onto car and had it tuned accordingly?

