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
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:

    Fuel pump - removal and refitting
    Removal 1 The fuel pump is integral with the fuel level sender unit in the fuel tank (see illustration). 7.1 Integral fuel level sender unit/fuel pump - 1.4 CFI engine A Fuel pump B Sender unit ...

    Seat belts - removal and refitting
    Front belt - 3-door models Note: Note the fitted sequence of any plates, washers and spacers when unbolting the seat belt anchors. Removal 1 Slide the belt stalk cover upwards to expose the anch ...

    Sump - removal and refitting
    Note: New gaskets and sealing strips will be required for refitting, and sealing compound will be required to coat the gasket faces. Removal 1 If the engine is in the vehicle, proceed as follows, ...