Test Step 1 - ACTIVE DTC

Start the engine and allow it to idle for at least 60 seconds.

WARNING:

When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

With a scan tool, read the active DTCs.

Is the DTC Active at this time?

Yes

Go to Test Step 2 - O2 SENSOR 2/2 HEATER ELEMENT

Perform the Checking for an Intermittent DTC diagnostic procedure. Refer to Checking For An Intermittent DTC .