Del Sol Si VTEC L4-1590cc 1.6L DOHC (VTEC) MFI (1997)
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Oxygen Sensor: Description and Operation
DESCRIPTION
By controlling the air/fuel ratio with a Primary HO2S (Sensor 1) and a Secondary HO2S (Sensor 2), the deterioration of the Primary HO2S
(Sensor 1) can be evaluated by its feedback period. When the feedback period of the HO2S exceeds a certain value during stable driving
conditions, the sensor will be judged as deteriorated. When deterioration has been detected during two consecutive trips, the MIL comes on and
DTC P0133 will be stored.
NOTE: If DTC P0131, P0132 and/or P0135 are stored at the same time as DTC P0133, troubleshoot those DTCs first, then troubleshoot DTC
P0133.
