DTC P0133: Notes

DTC P0133 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0133	Front HO2S circuit problem
DETECTION CONDITION	PCM monitors inversion cycle period, lean-to-rich response time and rich-to-lean response time of the sensor. PCM calculates the average of the inversion cycle period-specified inversion cycles, average response time from lean-to-rich, and from rich-to-lean when monitoring conditions are met. If the following conditions are met, PCM determines that circuit has malfunction. The average value of the inversion cycle period or the lean-to-rich/rich-to-lean response time is more than the threshold value the following monitoring conditions are met. MONITORING CONDITIONS HO2S heater, HO2S, and TWC Repair Verification Drive Mode Following conditions are met: Calculation load is 17-50% (MT), 17-59% (AT) (at engine speed 2,000 RPM ). Engine speed is 1,500-4,000 RPM. Vehicle speed is above 3.76 km/h {2.33 MPH} . Engine coolant temperature is above -10 °C {14 °F} . Front HO2S signal inversion cycle is above 10 cycles . The inversion cycle period and the lean-to-rich/rich-to-lean response time cannot be measured even once even though the accumulated occurrence time of the following monitoring conditions has exceeded the prescribed time limit. MONITORING CONDITIONS Following conditions are met: Calculation load is 17-50% (MT),17-59% (AT) (at engine speed 2,000 RPM). Engine speed is 1,500-4,000 RPM. Vehicle speed is above 3.76 km/h {2.33 MPH} . Engine coolant temperature is above -10 CC {14 °F} . Diagnostic support note This is an intermittent monitor (HO2S). 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. DIAGNOSTIC MONITORING TEST RESULTS is available. FREEZE FRAME DATA is available. DTC is stored in the PCM memory.
POSSIBLE CAUSE	Front HO2S deterioration Front HO2S heater malfunction Looseness front HO2S Pressure regulator (built-in fuel pump unit) malfunction Fuel pump malfunction Fuel filter (built-in fuel pump unit) clogged or restricted Fuel leakage on fuel line from fuel distribution pipe and fuel pump Leakage exhaust system Purge solenoid valve malfunction Purge solenoid hoses improper connection Insufficient compression Engine malfunction (Leakage engine coolant)

DTC P0133

Front HO2S circuit problem

DETECTION CONDITION

PCM monitors inversion cycle period, lean-to-rich response time and rich-to-lean response time of the sensor. PCM calculates the average of the inversion cycle period-specified inversion cycles, average response time from lean-to-rich, and from rich-to-lean when monitoring conditions are met. If the following conditions are met, PCM determines that circuit has malfunction.
- The average value of the inversion cycle period or the lean-to-rich/rich-to-lean response time is more than the threshold value the following monitoring conditions are met.
- HO2S heater, HO2S, and TWC Repair Verification Drive Mode
- Following conditions are met:
  - Calculation load is 17-50% (MT), 17-59% (AT) (at engine speed 2,000 RPM ).
  - Engine speed is 1,500-4,000 RPM.
  - Vehicle speed is above 3.76 km/h {2.33 MPH} .
  - Engine coolant temperature is above -10 °C {14 °F} .
  - Front HO2S signal inversion cycle is above 10 cycles .
- The inversion cycle period and the lean-to-rich/rich-to-lean response time cannot be measured even once even though the accumulated occurrence time of the following monitoring conditions has exceeded the prescribed time limit.
- Following conditions are met:
  - Calculation load is 17-50% (MT),17-59% (AT) (at engine speed 2,000 RPM).
  - Engine speed is 1,500-4,000 RPM.
  - Vehicle speed is above 3.76 km/h {2.33 MPH} .
  - Engine coolant temperature is above -10 CC {14 °F} .

Diagnostic support note

This is an intermittent monitor (HO2S).
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.
DIAGNOSTIC MONITORING TEST RESULTS is available.
FREEZE FRAME DATA is available.
DTC is stored in the PCM memory.

POSSIBLE CAUSE

Front HO2S deterioration
Front HO2S heater malfunction
Looseness front HO2S
Pressure regulator (built-in fuel pump unit) malfunction
Fuel pump malfunction
Fuel filter (built-in fuel pump unit) clogged or restricted
Fuel leakage on fuel line from fuel distribution pipe and fuel pump
Leakage exhaust system
Purge solenoid valve malfunction
Purge solenoid hoses improper connection
Insufficient compression
Engine malfunction (Leakage engine coolant)