DTC Advanced Diagnostics: P0133
DTC P0133:Air/Fuel Ratio (A/F) Sensor (Sensor 1) Malfunction/Slow Response

General Description

The air/fuel ratio (A/F) sensor (sensor 1) has a linear signal output in relation to the oxygen concentration. The powertrain control module (PCM) computes the air/fuel ratio from the A/F sensor (sensor 1) output voltage and uses fuel feedback control to improve exhaust emissions. The PCM compares the response characteristics against the A/F sensor (sensor 1) output. If the total A/F sensor (sensor 1) output is a specified value for a specified time, the PCM detects a deteriorated response and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Once per driving cycle
Sequence
None
Duration
8.0 seconds or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
Minimum
Maximum
Elapsed time after application of power to A/F sensor heater starts
5.0 seconds
–
Engine coolant temperature [ECT SENSOR 1]
156 °F (69 °C)
–
Intake air temperature
[IAT Sensor (1)]
-13 °F (-25 °C)
–
Engine speed
[ENGINE SPEED]
1,250 rpm
3,300 rpm
Vehicle speed
[VEHICLE SPEED]
33 mph (52 km/h)
–
Fuel trim
0.69
1.47
Fuel feedback
Closed loop at stoichiometric
Other
Without excessive load change
[ ]: HDS Parameter

Malfunction Threshold (USA and Canada models)
The total A/F sensor (sensor 1) output value is 0.00023 - 0.00133* or less in 8.0 seconds.

*: Depending on engine speed and load.

Malfunction Threshold (Mexico models)
The total A/F sensor (sensor 1) output value is 0.00041 or less in 8.0 seconds.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
A/F sensor (sensor 1) deterioration

Confirmation Procedure
Operating Condition

1.
Start the engine. Hold the engine speed [ENGINE SPEED] at 3,000 rpm without load (CVT in P or N, M/T in neutral) until the radiator fan comes on.
2.
Drive the vehicle at a steady speed of 25 mph (40 km/h) or less, for at least 5 minutes.
3.
Drive immediately at a steady speed of 33 mph (52 km/h) or more and engine speed [ENGINE SPEED] between 1,250 - 3,300 rpmfor at least 5 seconds.
Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.