KX Models
Advanced Diagnostics - DTC P0133: Air/Fuel Ratio (A/F) Sensor (Sensor 1) Malfunction/Slow Response (Engine Type: R18Z1)General Description
The air/fuel ratio (A/F) sensor (sensor 1) has a linear signal output in relation to the oxygen concentration. The engine control module (ECM)/powertrain control module (PCM) computes the air/fuel ratio from the A/F sensor output voltage and uses fuel feedback control to improve exhaust emissions. The ECM/PCM compares the response characteristics against the A/F sensor output. If the total A/F sensor output is a specified value for a specified time, the ECM/PCM detects a deteriorated response and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Enable Conditions
Malfunction Threshold
The total A/F sensor (sensor 1) output value is 30 or less in 7.0 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
With the HDS
None.
With the Driving Pattern
1. Start the engine. Hold the engine speed [ENGINE SPEED] at 3,000 rpm without load (A/T 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 1,400 - 3,300 rpm for at least 7 seconds.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the ECM/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 battery.