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General Smog Check

Jaguar XJ Drive Cycle for Emission Monitor Readiness

I have Jaguar XJ with the oxygen sensor monitor not ready. The smog tech says it will fail the smog test. I need to know how to perform a drive cycle on my Jaguar so i can make all the monitor complete. Any ideas? Thank you.


It is recommended to drive at least 300 miles over the course of a week in order to get your Jaguar XJ's emission monitors ready for the smog test. Usually driving in normal traffic on both city streets and highways completes the drive cycle. Sometimes however, due to individual driving habits/patterns, the drive cycle is not completed (or even initiated). That's when you have to follow a specific drive cycle designed for Jaguar vehicles.

Take extra caution when performing the drive cycle on city streets and highways as there are many stops, slow downs, and speed ups. Perform the drive cycle at your own risk. Ensure to follow all traffic laws.

Jaguar XJ Drive Cycle

The following procedure is designed to complete the OBD II monitors required to get your Jaguar to pass the OBD II monitors portion of the smog check, also known of the I/M readiness test. You may use a scan tool in order to monitor the status of the emission monitors as your Jaguar XJ is being driven.

The Engine Management and Transmission Control systems are continuously checked during vehicle operation by the Engine Control Module (ECM) and Transmission Control Module (TCM) on-board diagnostic (OBD) facilities. Powertrain OBD incorporates six diagnostic monitors. Each monitor has an associated group of DTCs. The diagnostic monitors will complete the diagnostic test(s) if a specified service "drive cycle" is carried out.

The six diagnostic monitors are as follows:

Heated Oxygen Sensors Monitor, Adaptive Fuel Monitor, Misfire Monitor, Catalyst Efficiency Monitor, Evaporative System Monitor, Comprehensive Component Monitor (Engine Management / Transmission).

Diagnostic Monitors Drive Cycle

You can ensure that an OBD monitor drive cycle is completed and that all or specific components have been checked by completing a specified drive cycle. Use the following drive cycles to confirm that the components and subsystems covered by the diagnostic monitors are operating correctly.

Heated Oxygen Sensors Monitor Drive Cycle

Upstream (Universal) oxygen sensors:

1. Ensure the engine is off and cooling fans are inoperative (not running) for less then 20 seconds.

2. Start the engine and bring it to normal operating temperature, above 180 F. This should be achieved when you notice the engine temperature gauge near center.

3. Begin driving. Drive the vehicle, keeping RPMs between 3000 - 4000 and at a steady speed.

4. Lift you foot completely off the accelerator and coast to a stop within 30 seconds. Do not touch accelerator pedal for 4 seconds after coming to a stop.

5. Repeat step 4.

6. Stop the vehicle and idle the engine for 11 minutes.

Downstream oxygen sensors:

1. Start the engine and bring it to normal operating temperature, above 108 F. If continuing the drive cycle from the Upstream O2 sensor section you may omit this line item.

2. Drive the vehicle steadily between 30 - 60 mph for 10 minutes. Drive the vehicle above 3000 RPM and in 4th gear at a steady speed.

3. Lift foot completely off accelerator and coast for 30 seconds.

Oxygen sensor heaters:

1. Start engine and bring to normal operating temperature, above 180 F.

2. Idle the engine for 3 minutes.

Adaptive Fuel Monitor Drive Cycle

1. Start the engine and bring it to normal operating temperature, above 180 F.

2. Allow the engine to idle for a minimum of 10 minutes.

Catalyst Efficiency Monitor Drive Cycle

1. Start engine and bring to normal operating temperature, above 180 F.

2. Drive vehicle steadily keeping the RPMs between 1700 - 2500 for 5 minutes.

Evaporative System Monitor Drive Cycle

1. Ensure your Jaguar's fuel filler cap (gas cap) is fully closed. You should hear a minimum of three clicks when closing the gas cap.

2. Ensure your fuel tank level is between 30% to 85% full. An empty or completely full gas tank will not allow the EVAP monitor to run.

3. Drive the vehicle for a minimum of 2 minutes, and until engine is at normal operating temperature.

4. Stop the vehicle and switch off the ignition. Leave the ignition off for 30 seconds, then restart the engine.

5. Accelerate briskly to 50 mph ensuring that the engine speed reaches at least 3500 rpm for a minimum of 5 seconds.

6. Drive the vehicle steadily between 40 - 60 mph for at least 12 minutes.

7. Gently coast the vehicle to a stop. Allow the engine to idle for 2 minutes.

posted by SmogTips Support

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