Code 44, Lean Exhaust Indication - 4.3L Turbo: 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.

This tests oxygen sensor heating element. Heating element resistance should be 3.5 ohms at 68°F (20°C) and 14 ohms at 562°F (350°C).
Code 44 sets when O2 sensor signal at ECM is less than .2 volt for at least 2 minutes and system is operating in "closed loop".