TL L5-2451cc 2.5L SOHC MFI (1997)
NOTE:
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If DTC PO13O and/or P0135 are stored at the same time as DTC P0133, troubleshoot those DTCs first, then troubleshoot DTC P0133.
Possible Cause
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Primary HO2S Deterioration
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Primary HO2S Heater Deterioration
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Leakage exhaust system leakage
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Air cleaner (ACL) element damaged or dirty
(_P0139_)
The scan tool indicates Diagnostic Trouble Code (DTC) PO139: As low response problem in the Secondary Heated Oxygen Sensor (Secondary
HO2S) circuit.
