Wonder why someone would cut the data link grounds? Does the check engine light bulb check when you turn the ignition on? Maybe they took the bulb out.
P1133 is the Bank 1 sensor 1 A/F sensor response code.
P1155 is a Bank 2 sensor 1 A/F heater circuit code
Inspect the wiring and connectors for the A/F sensors. Make sure there isn't oil or other fluids leaking onto the connectors. Make sure the wires haven't chaffed on something or got burnt on the exhaust
For the P1133 you need a scan tool to look at the O2 sensor information. The A/F sensor is what they call a wide band O2 sensor. The only way check it is with a scan tool that can get into the ECU's data stream. With the scan tool information you do a A/F sensor response test by either adding propane or creating a large vacuum leak to see if the A/F sensor responds correctly. If the A/F sensor responds properly then you need to drive the vehicle and see what the computer is doing with the fuel trims to see if you have a lean or rich problem.
For the P1155, the heater circuit for the B1S2 A/F can be checked with a volt meter. You can also ohm out the heater in the O2 to see if it is open.