Code 64, Right Heated Oxygen Sensor Lean Indication: Notes

NOTE: Engines are equipped with 2 oxygen sensors. On these models, Code 64 will set if the right sensor circuit is lean. Code 44 will set if the left sensor circuit is lean.

O2 sensor acts like an open sensor circuit and produces no voltage when exhaust temperature is less than 600°F (316°C). An open sensor circuit or cold sensor causes "open loop" operation.

NOTE: Test number refers to number on diagnostic chart.

Checks to see if O2 sensor is registering a lean condition. Code 64 is set when O2 sensor voltage signal at control module is low (less than .3 volt) for a precalibrated period and system is operating in "closed loop".