(O,M) Park/Neutral Position (PNP) or Clutch Pedal Position (CPP) circuit fault Electronic shift transmission - Manual Lever Position (MLP) sensor out of range in PARK - Transmissions
Error Code :634 Catalyst System Efficiency Below Threshold. The catalyst system being referred to is your three-way catalytic converter; so the catalytic converter is not working properly (i.e. it's not efficient).
The check engine light has been intermittent sometimes not coming on at all.. the message Control Panel indicates for the very first time, that there is a stability link traction control problem.