Lancer L4-2.0L (4B11) (2008)
CAUTION:
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Be very careful when connecting the jumper wire; incorrect connection can damage the oxygen sensor.
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Be careful the heater is broken when voltage of beyond 8 V is applied to the oxygen sensor heater.
NOTE: If the sufficiently high temperature (of approximate 400 °C or more) is not reached although the oxygen sensor is normal, the output
voltage would be possibly low although the rich air-fuel ratio. Therefore, if the output voltage is low, use a jumper wire to connect terminal No. 1
(red clip of special tool) and terminal No. 3 (blue clip of special tool) of the oxygen sensor with a (+) terminal and (-) terminal of 8 V power
supply respectively, then check again.
8. If the output voltage is not within the standard value, replace the heated oxygen sensor.
NOTE: For removal and installation of the heated oxygen sensor, refer to Intake and Exhaust, Exhaust Pipe and Main Muffler - Removal and
installation.
Heated oxygen sensor (rear) <Except for California>
1. Disconnect the heated oxygen sensor connector and connect special tool MB991658 to the connector on the heated oxygen sensor side.
2. Make sure that there is continuity [4.5 - 8.0 ohms at 20 °C (68 °F)] between terminal No. 1 and terminal No. 2 on the heated oxygen sensor
connector.
3. If there is no continuity, replace the heated oxygen sensor.
4. Warm up the engine until engine coolant is 80 °C (176 °F) or higher.
5. Drive at 50 km/h (31 mph) or more for 10 minutes.
6. Connect a digital voltage meter between terminal No. 3 and terminal No. 4.