Discovery II
EMISSION CONTROL - V8
17-2-56 REPAIRS
Sensor - heated oxygen (HO
2
S) - pre-
catalytic converter
$% 19.22.16
Remove
1. Raise vehicle on a ramp.
2. Release HO
2
S multiplug from support bracket.
3. Release HO
2
S harness from clip and
disconnect multiplug from HO
2
S .
4. Using a 22 mm crow's-foot spanner, remove
HO
2
S.
CAUTION: HO
2
sensors are easily damaged
by dropping, excessive heat or
contamination. Care must be taken not to
damage the sensor housing or tip.
Refit
1. Clean sensor and exhaust pipe mating
surfaces.
2. If refitting existing sensor, apply anti-seize
compound to sensor threads.
WARNING: Some types of anti-seize
compound used in service are a health
hazard. Avoid skin contact.
NOTE: A new HO
2
sensor is supplied pre-
treated with anti-seize compound.
3. Fit a new sealing washer to HO
2
S
4. Fit HO
2
S and tighten to 45 Nm (33 lbf.ft).
5. Connect multiplug to HO
2
S, and secure to
support bracket and harness clip.
6. Lower vehicle.