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, OBD Status
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | 8.0 seconds or more |
| DTC Type | Two drive cycles, MIL on |
| OBD Status | PASSED/FAILED/EXECUTING/OUT OF (TEST) CONDITION |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Elapsed time after application of power to A/F sensor heater starts | 60 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 | 1, 500 rpm | 4, 000 rpm |
| Engine speed [ENGINE SPEED]*2 | 1, 250 rpm | 4, 000 rpm |
| Vehicle speed [VEHICLE SPEED] | 26 mph (41 km/h) | - |
| Fuel trim | 0.75 | 1.47 |
| Fuel feedback | Closed loop at stoichiometric | |
| No active DTCs set (prevents monitor from running) | P0010, P0011, P0069, P0087, P0088, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0134, P0135, P0171, P0172, P0192, P0193, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0335, P0339, P0340, P0341, P0344, P0351, P0352, P0353, P0354, P0400, P0401, P0404, P0443, P0496, P0497, P0502, P0522, P0523, P060A, P0720, P1009, P1109, P1157, P1172, P145C, P1659, P2096, P2097, P2101, P2118, P2122, P2123, P2127, P2128, P2135, P2138, P2176, P2195, P2228, P2229, P2238, P2252, P2413, P2648, P2649, P2A00 | |
| Other | Without excessive load change | |
*1: USA and Canada models
*2: Mexico models
[ ]: HDS Parameter
Malfunction Threshold (USA and Canada models)
The total A/F sensor (sensor 1) output value is 0.00074* 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 25 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 26 mph (41 km/h) or more and engine speed [ENGINE SPEED] between 1, 500 - 4, 000 rpm*1 (1, 250 - 4, 000 rpm)*2 for 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.