Lancer L4-2.0L (4B11) (2008)
8. If the output voltage is not within the standard value, replace the heated oxygen sensor.
NOTE:
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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.
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For removal and installation of the heated oxygen sensor, refer to Intake and Exhaust, Exhaust Pipe and Main Muffler - Removal and
installation.