California Emission Regulation Applicable ATX Model
DTC P0133 DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0133 |
Front HO2S circuit problem |
| DETECTION CONDITION |
- The PCM monitors the front HO2S output current and short term fuel trim (SHRTFT) when the following conditions are met. If the output current response is lower than that expected from the fuel trim, the PCM determines that the front HO2S circuit is slow.
MONITORING CONDITIONS
- HO2S heater, HO2S, and TWC Repair Verification Drive Mode
- Following conditions are met:
- Front HO2S heater monitor is completed.
- Fuel system loop status is closed loop fuel control.
Diagnostic support note
- This is an intermittent monitor. (HO2S)
- MIL illuminates if PCM detects above malfunction condition in two consecutive drive cycles or in one drive cycle while DTC for the same malfunction has been stored in PCM.
- DIAGNOSTIC MONITORING TEST RESULTS is available.
- PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
- FREEZE FRAME DATA is available.
- DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- Front HO2S deterioration
- Front HO2S malfunction
- Front HO2S looseness
- Pressure regulator (built-in fuel pump unit) malfunction
- Fuel pump malfunction
- Clogged or restricted fuel filter (built-in fuel pump unit)
- Fuel leakage in fuel line between fuel distribution pipe and fuel pump
- Exhaust system leakage
- Purge solenoid valve malfunction
- Improper connection purge solenoid hose
- Insufficient compression
- Engine malfunction (Engine coolant leakage)
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