Sensors

The sunlight sensor on the dashboard and passenger compartment temperature sensor in the ECC control panel should not be covered in any way as this could cause incorrect information to be sent to the ECC system.
See also:
Belt check
Check the belt regularly to make sure it is in
good condition and is clean. A worn or dirty belt
can cause poor cooling and low alternator output
as well as impair the operation of the power
steer ...
Spots on interior plastic, metal, or wood surfaces
Cleaning interior plastic components should
be done with a cleaning agent specially
designed for this purpose. Consult your Volvo
retailer. ...
ABS with EBD (Electronic Brake ForceDistribution)
EBD is an integrated part of the ABS system.
EBD regulates the hydraulic pressure to the
rear brakes to help provide optimal braking
capacity. The brake pedal will pulsate during
braking, which ...
