key sensor and tire sensor

Nitrogen makes no difference for your tires or Tire Pressure Monitoring System (TPMS). If you are getting a low tire warning it means one of the following:

1) At least one of your tires is low.

2) The TPMS is not properly calibrated.

3) Something is wrong with your TPMS.

The first thing you should do is check your tire pressure. If it is okay, then press the TPMS set button under the steering wheel to establish the set point.

Your Smart Key System (SKS) isn't working because some fat fingered technician at the dealership pressed the SKS button under the steering wheel instead of the TPMS button. Go out and press the SKS button and your keys will work again.

Tom

 

You might want to check the MAX psi of your tires and what the shop actually put in your tires. Many shops just put 35lbs in every tire without looking at the tire. According to an engineer at Bridgestone/Firestone who is a personal friend, no on-road tire should be run at less than 10% of max. The dealer was putting 35psi in our car's tires that were max 44psi tires...that's not enough and our mileage usually suffered immediately.
Also Just as qbee42 said above your TPMS may be set wrong and need to be re-calibrated particularly if you have changed tire's since you first purchased the car. Tires from different manufacturers even in the same size may run at different pressures because of sidewall thickness and tire composition.

 

The button on the door handle is for locking, not unlocking. To unlock using SKS, simply grasp the door handle and pull, just as you would if the door were unlocked.

If you get a long beep when trying to lock with the door button, that is an indication that the car is unwilling to lock. It could mean that a door is ajar or that you have left another key fob inside the car.

Tom