DTC Advanced Diagnostics: P0133
DTC P0133: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Malfunction/Slow Response
General Description
The rear air/fuel ratio (A/F) sensor (bank 1, 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 rear A/F sensor (bank 1, sensor 1) output voltage and uses fuel feedback control to improve exhaust emissions. The PCM compares the response characteristics against the rear A/F sensor (bank 1, sensor 1) output. If the total rear A/F sensor (bank 1, 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 | 7.0 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 deg.F (69 deg.C) | - | |
| Intake air temperature [IAT SENSOR (1)] | -13 deg.F (-25 deg.C) | - | |
| Engine speed [ENGINE SPEED] | 1, 500 rpm | 2, 250 rpm | |
| MAP value [MAP SENSOR] | 1, 250 rpm | 67 kPa (19.7 inHg, 500 mmHg) | 86 kPa (25.5 inHg, 650 mmHg) |
| 2, 000 rpm | 40 kPa (11.9 inHg, 300 mmHg) | ||
| Vehicle speed [VEHICLE SPEED] | 36 mph (57 km/h) | - | |
| Fuel trim | 0.73 | 1.47 | |
| Fuel feedback | Closed loop at stoichiometric | ||
| Monitoring priority | P0400, P219A | ||
| Other | Without excessive load change | ||
[ ]: HDS Parameter
Malfunction Threshold
The total rear A/F sensor (bank 1, sensor 1) output value is 0.00068* or less in 7.0 seconds.
*: Depending on engine speed and load.
Possible Cause
- Rear A/F sensor (bank 1, sensor 1) deterioration
Confirmation Procedure
Operating Condition
- Start the engine. Hold the engine speed [ENGINE SPEED] at 3, 000 rpm without load (in P or N) until the radiator fan comes on.
- Drive the vehicle at a steady speed of 25 mph (40 km/h) or less, for at least 5 minutes.
- Drive immediately at a steady speed of 36 mph (57 km/h) or more and engine speed [ENGINE SPEED] between 1, 500 - 2, 250 rpm for at least 7.0 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.