hi guys..

any more 2010-mazda 3 owners here?

i am having a few issues with my M3-2010 as below, appreciate if you guys can advise,

1) Passenger side door (front & rear) not locking when lock the driver's door. Sent to Mazda-SC, told me to change the door lock actuator, any of you guys had the same problem before? Strange thing is, i can lock all doors using the remote (with double tap-single tap on the lock button only locks driver side)
2) Jerking when putting the car in reverse, updated the TCM at Mazda-SC, however still the same, only a bit of improvement. Gearbox problem? Or TCM problem?
3) CEL with code P0296 - Post Catalyst System Fuel Trim Too Lean on Bank 1. Mazda-SC told me to clean the throttle body, anyone with the same CEL before? Any rectification?
4) Sound like water splashing under the car when going through uneven road. It sounded like i was carrying a big bottle of water under the car.

Appreciate if you guys can advise if you have any of the same problem.