DTC P0133 (1.5 L Engine)
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 | 9.0 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 | 3, 000 rpm | |
| Vehicle speed [VEHICLE SPEED] | 26 mph (41 km/h) | - | |
| Fuel trim | 0.75 | 1.47 | |
| Intake air amount | 1, 500 rpm | 0.15 g (0.0053 oz) | 0.30 g (0.0105 oz) |
| 2, 500 rpm | 0.16 g (0.0057 oz) | 0.30 g (0.0105 oz) | |
| Fuel feedback | Closed loop at stoichiometric | ||
| Other | Without excessive load change | ||
[ ]: HDS Parameter
Malfunction Threshold
The total A/F sensor (sensor 1) output value is 99 deg. or less in 9.0 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
- 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 26 mph (41 km/h) or more and engine speed [ENGINE SPEED] between 1, 500 - 3, 000 rpm for at least 9.0 seconds.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
[ ]: HDS Parameter
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.