So codes for: CPS or ECU, Oxygen sensor or ECU and AFM temp sensor or ECU.....
The code 12 may be set if the vehicle stalls and is restarted by 'popping the clutch' or if it is push started. So if you've done either recently you may want to clear the codes and see if this one returns. If it does a bad CPS, wiring, fault in the starter circuit or the ECU may be to blame.
The code 21 well, a bad oxygen sensor won't cause a significant change in the fueling. The ECU is SUPPOSED to disregard the OX input after a minute or so of an 'out of bounds' signal. You may disconnect the O2 sensor to put the car into open loop operation to see if it drives any better.... BUT even if it does drive better that doesn't mean the O2 sensor was to blame.
Code 24 is important. The ECU must know what temperature the incoming air is in order to properly adjust timing and fuel. Test the AFM before anything else.
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