DTC P0133:00 [L5]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITIONS & POSSIBLE CAUSES

DTC P0133:00	A/F sensor circuit slow response
DETECTION CONDITION	Oxygen sensor malfunction is detected by measuring of the average frequency of oxygen sensor signal, time required to pass from rich to lean, time required to pass from lean to rich. The average frequency of oxygen sensor signal is more than the threshold value. MONITORING CONDITIONS A/F sensor heater, HO2S heater, A/F sensor, HO2S, and TWC Repair Verification Drive Mode Following conditions are met: A/F sensor heater monitor is completed Fuel system loop status is closed loop fuel control. ECT sensor and A/F sensor heater are normal Engine speed: 1, 200-3, 500 RPM Charging efficiency: 16-63 % Engine coolant temperature. above 60°C {140°F} Diagnostic support note This is an intermittent monitor. (A/F sensor, HO2S) The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA is available. The DTC is stored in the PCM memory
POSSIBLE CAUSE	A/F sensor malfunction Connector or terminal malfunction Exhaust system leakage A/F sensor deterioration Related wiring harness malfunction Fuel pump malfunction Fuel leakage in fuel line from fuel distribution pipe to fuel pump Clogged or restricted fuel filter Pressure regulator malfunction Fuel pump unit malfunction Purge solenoid valve malfunction Engine malfunction Engine coolant leakage Insufficient compression PCM malfunction

DTC P0133:00

A/F sensor circuit slow response

DETECTION CONDITION

Oxygen sensor malfunction is detected by measuring of the average frequency of oxygen sensor signal, time required to pass from rich to lean, time required to pass from lean to rich.
The average frequency of oxygen sensor signal is more than the threshold value.
MONITORING CONDITIONS
- A/F sensor heater, HO2S heater, A/F sensor, HO2S, and TWC Repair Verification Drive Mode
- Following conditions are met:
  - A/F sensor heater monitor is completed
  - Fuel system loop status is closed loop fuel control.
- ECT sensor and A/F sensor heater are normal
- Engine speed: 1, 200-3, 500 RPM
- Charging efficiency: 16-63 %
- Engine coolant temperature. above 60°C {140°F}

Diagnostic support note

This is an intermittent monitor. (A/F sensor, HO2S)
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory

POSSIBLE CAUSE

A/F sensor malfunction
- Connector or terminal malfunction
- Exhaust system leakage
- A/F sensor deterioration
- Related wiring harness malfunction
Fuel pump malfunction
- Fuel leakage in fuel line from fuel distribution pipe to fuel pump
- Clogged or restricted fuel filter
- Pressure regulator malfunction
- Fuel pump unit malfunction
Purge solenoid valve malfunction
Engine malfunction
- Engine coolant leakage
- Insufficient compression
PCM malfunction