HO2S Monitor Code

• Do not turn ignition switch off.
• When negative battery cable is disconnected, all readiness codes are cleared.

Ensure ambient temperature is 20-95°F (-7-35°C).

1. Connect scan tool to DLC.
2. Start engine and hold at 3000 RPM with no load (in park or neutral) until radiator fan comes on.
3. Let engine idle for 5 seconds.
4. Drive vehicle at steady speed between 50 and 62 MPH for about two minutes
5. With A/T in "D" position, M/T in 5th gear, decelerate from 62 MPH by completely releasing throttle for 5 seconds. If engine is stopped during this procedure, repeat step 4) and 5).
6. Check for readiness code with scan tool.