1. Remove the intake manifold. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.)
2. Remove the knock sensor attachment bolt to remove the knock sensor.

3. Install in the reverse order of removal.
Tightening torque 16.2-23.8 N·m
{1.66-2.42 kgf·m, 12.0-17.5 ft·lbf}
Knock sensor inspection
Heated oxygen sensor (ho2s) inspectionMazda 6 Service Manual: Front oil seal
FRONT OIL SEAL REPLACEMENT
1. Disconnect the negative battery cable.
2. Remove the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION.)
3. Remove the Cylinder head cover. (See Cylinder Head Cover Installation
Note.)
4. Remove the drive belt. (See DRIVE BELT REPLACEMENT.)
5. Remove the front dr ...
Mazda 6 Service Manual: Headlight aiming
Low-beam
1. Set up a screen as shown in the figure below for aiming the headlights.
2. Adjust the tire air pressure to the specification.
3. Position the unloaded vehicle on a flat, level surface.
4. Seat one person in the driver's seat.
5. Position the vehicle straight ahead and perpendicu ...