It is probably a faulty O2 sensor. But check O2 sensor wiring and connections for damage first.
Trouble code P1516 means: TAC Module Throttle Actuator Position Performance
Trouble Code P1640 means:Control module output A circuit
For 1996 and newer Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)
Trouble code P0234 means:Engine overboost condition
Trouble code P0171 means: Fuel System Lean (Bank 1)
Trouble code P0177 means:Fuel composition sensor circuit range/performance
Trouble code P0483 means: Fan Performance
Trouble code P1693 means: A companion DTC was set in both the ECM and PCM
Trouble code P1694 means: No CCD message from PCM- Aisin transmission
Trouble code P0340 means:Camshaft position sensor circuit malfunction
Trouble code P0573 means:Cruise control/brake switch A circuit high
Trouble code P0401 means: Insufficient EGR Flow Detected Replace the EGR Valve