Hint:

How to proceed with troubleshooting
Terminals of ecuHeated oxygen sensor
Components
Removal
Disconnect cable from negative battery
terminal
Caution:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
Remove heated oxygen sensor (for bank 1 sensor 2)
...
Driver side - side airbag sensor circuit malfunction
Description
The side airbag sensor lh consists of part including the diagnostic circuit
and the lateral deceleration
sensor.
When the center airbag sensor receives signals from the lateral deceleration
sensor, it determines
whether or not the srs should be activated.
Dtc b1620/21 is ...
Reassembly
Hint:
Use high-temperature grease to lubricate the bearings,
gears, return spring and steel ball when assembling the
starter.
Install planetary gear
Apply grease to the planetary gears and pin parts of
the planetary shaft.
Install the 3 planetary gears.
Install starter arm ...