Code 61 - Degraded Oxygen (O2) Sensor (3.1L (Exc. CALIF.)

If a Code 61 is stored in memory, ECM has determined O2 sensor is contaminated or degraded because voltage change time (cross counts) is slow or sluggish.

ECM performs O2 sensor response time test when coolant temperature is more than 185°F (85°C), MAT temperature is greater than 50°F (10°C), system is in "closed-loop" or in a decel fuel cut-off mode. If Code 61 is stored, O2 sensor should be replaced.