Heated oxygen sensors

The heated oxygen sensors monitor the oxygen content of the exhaust gases. Readings are fed into a control module that continuously monitors engine functions and controls fuel injection. The ratio of fuel to air into the engine is continuously adjusted for efficient combustion to help reduce harmful emissions.
See also:
Fuse box in the passenger compartment, behind the plastic cover, driver's
side
This fuse box is located behind the plastic
cover below the steering wheel. When replacing
a blown fuse, be sure to replace it with a
new one of the same color and amperage (written
on the fuse) ...
Battery
• Ensure that the battery cables are correctly
connected and tightened.
• Never disconnect the battery when the
engine is running (e.g., when replacing the
battery).
• Never use a fast charger to ...
Accessory installation
• We strongly recommend that Volvo owners
install only genuine, Volvo-approved
accessories, and that accessory installations
be performed only by a trained and
qualified Volvo service technician.
...
