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What do engine codes 12 35 and 32 mean in a 1994 Plymouth grand voyager?

P12:

- Throttle Position Sensor (TPS) circuit low.

- Possible causes include a faulty TPS, wiring issues, or a problem with the PCM.

P35:

- Heated oxygen sensor (HO2S) heater circuit malfunction (bank 1, sensor 1).

- This code can be caused by a faulty oxygen sensor, wiring issues, or a problem with the PCM.

P32:

- Oxygen sensor - Circuit high input (Bank 1, sensor 1)

- The code means that the oxygen sensor is not detecting enough oxygen in the exhaust stream, which could be caused by several factors, including a bad sensor, a vacuum leak, or an exhaust leak.