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0720 means the computer is either not getting an accurate OSS output shaft speed signal, no signal, or the signal is not what its expecting to see. Which means the sensor wiring or sensor is messed up or it is slipping.
2106 means the computer has limited the power because is senses a concern that can cause more damage or a collision so it is not letting the throttle body fully open.
When accelerating from a stop does it seem to be in 1st gear and can you go into detail on what 1st and 2nd gear do as well as the 1-2 shift, any concerns noticed with them?
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