DTC P0133 [L8, LF]

id0102b1804800

DTC P0133	A/F sensor circuit problem
DETECTION CONDITION	•  The PCM monitors the A/F sensor current slow response while A/F fluctuation being provided when the following monitoring conditions are met. If the average value of slow response and/or delayed response is more than specified value, the PCM determines the A/F sensor has a deterioration. MONITORING CONDITIONS ―  Drive Mode 03 (A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification) ―  Following conditions are met: •  Engine speed: 1,750—3,500 rpm •  Charging efficiency: 19—63% (at engine speed 2,500 rpm) •  Engine coolant temperature: above 60 °C {140 °F} •  A/F sensor heater monitor is completed. •  Fuel system loop status is closed loop fuel control. 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 the first drive cycle. •  FREEZE FRAME DATA (Mode 2/Mode 12) is available. •  The DTC is stored in the PCM memory.
POSSIBLE CAUSE	•  A/F sensor connector or terminals malfunction •  A/F sensor malfunction ―  A/F sensor looseness •  Exhaust system leakage •  Fuel supply system malfunction or improper fuel line malfunction ―  Pressure regulator (built-in fuel pump unit) malfunction ―  Clogged or restricted fuel filter (built-in fuel pump unit) ―  Fuel leakage in fuel line between fuel distribution pipe and fuel pump •  Purge system malfunction ―  Purge solenoid valve malfunction ―  Improper connection purge solenoid hose •  Engine malfunction ―  Engine coolant leakage ―  Insufficient compression •  A/F sensor deterioration •  PCM malfunction

Diagnostic procedure