Heated Exhaust Gas Oxygen (HEGO) sensor - removal and refitting
Note: A new sealing ring will be required on refitting.
Removal
1 Apply the handbrake, then jack up the front
of the vehicle and support it on axle stands
(see “Jacking and Vehicle Support”).
2 Disconnect the battery negative lead.
3 Unclip the wiring and disconnect the sensor wiring plug (see illustration).
17.3 Heated exhaust gas oxygen (HEGO) sensor - 1.4 CFI engine
A Sealing ring
B HEGO sensor
C Sensor shield
4 Remove the sensor heat shield, then unscrew the sensor from the exhaust downpipe, and carefully remove it complete with sealing ring.
Warning: Do not touch the tip of the HEGO sensor.
Refitting
5 Refitting is a reversal of removal, bearing in
mind the following points.
6 Clean the sensor threads, and take care not to touch the tip of the sensor during the refitting procedure.
7 Use a new sensor sealing ring.
8 Tighten the sensor to the specified torque.
9 On completion, start the engine and check for leaks between the sensor and the exhaust downpipe.
See also:
Crankcase ventilation system check (Every 12 000 miles (20 000 km) or 12
months)
1 Inspect the crankcase ventilation system
for blockage or damage. A blocked hose can
cause a build-up of crankcase pressure,
which in turn can cause oil leaks (see
illustration).
35.1 Loosenin ...
Ignition system electronic modules - removal and refitting
Amplifier module - electronic
breakerless system
Removal
1 The amplifier module is located on the side
of the distributor (see illustration).
6.1 Electronic amplifier module locations
A Early ...
Heater unit - overhaul
1 With the heater unit removed from the
vehicle, remove the two securing screws and
withdraw the heater matrix from the casing
(see illustrations).
19.1a Remove the securing screws . . .
19.1 ...
