Code Enable Criteria

• DTCs P0105, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0171, P0201-P0204, P0300, P0301-P0304, P0335, P0440, P0442, P0446, P0506, P0507, P0601, P0602, or P1441 are not set.
• Engine coolant temperature is more than 158°F (70°C).
• Battery voltage is more than 10 volts.
• Fuel level is more than 10 percent.
• Engine run time is more than 10 seconds.
• Engine speed is between 1600-2450 RPM.
• Engine is operating in closed loop.
• Throttle Position (TP) angle is 9-18 percent.
• Evaporative emissions control system is commanded open more than 36 percent.
• Purge learned memory is more than approximately 0.78.
• Diagnostic completes when 30 seconds of accumulated time has been spent in specified conditions.

DTC sets when average O2S1 response times are more than 1119 milliseconds for rich to lean sweeps, or 760 milliseconds for lean to rich sweeps. Or sum of rich to lean and lean to rich is more than 1235 milliseconds.