2012 Jeep Wrangler JK Factory Service Manual 28 - DTC-Based Diagnostics

P0133-O2 SENSOR 1/1 SLOW RESPONSE

P0133-O2 SENSOR 1/1 SLOW RESPONSE

Special Tools: Click to display a list of tools used in this procedure


For a complete wiring diagram, refer to the Wiring Information.



Possible Causes

RESTRICTED AIR FILTER
RESTRICTION IN THE INTAKE SYSTEM
INTAKE SYSTEM LEAK
EXHAUST SYSTEM LEAK OR RESTRICTION
FUEL DELIVERY SYSTEM FAILURE
OXYGEN SENSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).


1. DTC IS ACTIVE

1. Ignition on, engine not running.
2. With the scan tool, erase DTCs in the PCM.
3. Start the engine and allow it to reach operating temperature.
4. Test drive the vehicle.
5. With the scan tool, select View DTCs.


Is the status Active for this DTC?

Yes


No


2. CHECK THE AIR FILTER

1. Turn the ignition off.
2. Remove and inspect the Air Filter for soiling or excessive dirt and debris which may cause air flow restriction.
3. Check the Inlet Tube for signs of dirt, snow, or ice restricting airflow into the Air Filter Box.


Were any problems found?

Yes


No


3. CHECK FOR INTAKE SYSTEM RESTRICTIONS



NOTE: Damaged, restricted or poorly connected intake and Turbocharger related tubes can cause this DTC to set.
1. Turn the ignition off.
2. Inspect all air intake, crankcase vent and Turbocharger related hoses/tubes and connections.
3. Inspect the Charge Air Cooler inlet and outlet hoses/tubes and connections.
4. Inspect the EGR Air Flow Control Valve to ensure the valve is not stuck in the closed position.


Were any problems found?

Yes


No


4. CHECK FOR INTAKE SYSTEM AIR LEAKS

1. Remove the Crankcase Vent Heater.
2. Remove the Mass Air Flow Sensor from the Turbocharger Inlet Tube.
3. Seal off and/or plug the Turbocharger Inlet Tube where the MAF sensor was removed.
4. Connect the Evaporative Emissions Leak Detector Kit, EELD And Accessory 8404B to the Crankcase Vent Heater port in the intake duct and begin injecting smoke into the intake system.
5. Observe all intake system components for evidence of smoke leakage.


Is there evidence of smoke leakage?

Yes


No


5. CHECK THE EXHAUST SYSTEM FOR LEAKS OR RESTRICTION

1. Visually inspect the Exhaust system for signs of damage, leaks or restrictions.


Were any problems found?

Yes


No


6. CHECK THE FUEL DELIVERY SYSTEM

1. Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. (Refer to 29 - Non-DTC Diagnostics/Drivability - Diesel - Diagnosis and Testing) .


Were any problems found?

Yes


No


7. OXYGEN SENSOR

1. Replace the Oxygen Sensor in accordance with the service information.
2. Start the engine.
3. Allow the engine to reach normal operating temperature.
4. Test drive the vehicle.
5. With the scan tool, select View DTCs.


Is the status Active for this DTC?

Yes


No


8. POWERTRAIN CONTROL MODULE

1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the Powertrain Control Module.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.


Were any problems found?

Yes


No