Range Rover Sport (LS) V8-4.2L SC (2006)
/v8-4.2l_sc/Page-1069002.png)
maximum and minimum threshold, for open and short circuit conditions.
Oxygen sensors must be treated with the utmost care before and during the fitting process. The sensors have ceramic material within them that can easily
crack if dropped / banged or over-torqued. The sensors must be torqued to the required figure, (40-50Nm), with a calibrated torque wrench. Care should
be taken not to contaminate the sensor tip when anti-seize compound is used on the thread. Heated sensor signal pins are tinned and universal are gold
plated. Mixing up sensors could contaminate the connectors and affect system performance.
Failure Modes
^
Mechanical fitting & integrity of the sensor.
^
Sensor open circuit / disconnected.
^
Short circuit to vehicle supply or ground.
^
Lambda ratio outside operating band.
^
Crossed sensors bank A & B.
^
Contamination from leaded fuel or other sources.
^
Change in sensor characteristic.
^
Harness damage.
^
Air leak into exhaust system.
Failure Symptoms
^
Default to Open Loop fueling for the particular cylinder bank
^
High CO reading.
^
Strong smell of H02S (rotten eggs) till default condition.
^
Excess Emissions.
It is possible to fit front and rear sensors in their opposite location. However the harness connections are of different gender and color to ensure that the
sensors cannot be incorrectly connected. In addition to this the upstream sensors have two holes in the shroud, whereas the down stream sensors have
four holes in the shroud for the gas to pass through.
