What does code P0122 P0140 P0141 mean for a 1999 Buick Park Avenue?

The codes P0122, P0140, and P0141 for a 1999 Buick Park Avenue indicate issues related to the throttle position sensor (TPS) and the oxygen sensor (O2). P0122 signifies a low voltage signal from the TPS, which can affect engine performance. P0140 indicates a lack of activity or signal from the O2 sensor, while P0141 points to a malfunction in the heater circuit of the same sensor. These codes suggest potential problems with fuel management and emissions control, requiring diagnostic evaluation and possible repairs.