Code 44, Lean Exhaust Indication: Notes

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 numbers refer to test numbers on diagnostic chart.

Code 44 sets when O2 sensor signal remains low for a precalibrated period and system is operating in "closed loop".