Def Quality Sensor Removal/Installation: Notes

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the urea tank. (See UREA TANK REMOVAL/INSTALLATION .)
Disconnect the DEF quality sensor connector.

Courtesy of MAZDA MOTORS CORP.
CAUTION:
- If the DEF quality sensor O-ring is damaged, replace the O-ring.
Remove in the order shown in the figure. (See DEF Quality Sensor Installation Note .)

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Install in the reverse order of removal.