1. Connect the WDS or equivalent to the DLC-2.
2. Measure the PID value.
Note
PID/DATA MONITOR AND RECORD function table

Dtc p0841
TroubleshootingMazda 6 Service Manual: Center roof antenna removal/installation
   1. Disconnect the negative battery cable.
2. Remove the headliner. (See HEADLINER REMOVAL/INSTALLATION.)
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.
5. After installation, verify that the rubber of the center roof antenna is 
installed to the r ...
   
Mazda 6 Service Manual: Washer Fluid
   Inspecting Washer Fluid Level
WARNING
Use only windshield washer fluid or plain water in the reservoir: 
Using radiator antifreeze as washer fluid is dangerous. If sprayed on the windshield, 
it will dirty the windshield, affect your visibility, and could result in an accident.
Using Washer Flu ...