Oxygen Sensor Code 44

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HT4100 4.1, 4.5, 4.9 Discussion, Oxygen Sensor Code 44 in Cadillac Engine Discussion; Hello, In a state that doesn't test emissions on cars past 25 years old, it there a reason to replace ...
  1. #1
    nycnftm is offline Cadillac Owners Fanatic
    Automobile(s): 1983 Eldorado
    Join Date
    Jan 2008

    Oxygen Sensor Code 44

    Hello, In a state that doesn't test emissions on cars past 25 years old, it there a reason to replace the O2 sensor when I get a code 44 lean burn? Thanks in advance. 1983 Eldorado

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  3. #2
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
    Automobile(s): 69 Thunderbird | 90 Seville | 89 Marquis | 72 Torino
    Join Date
    Oct 2008
    Palm Bay, FL

    Re: Oxygen Sensor Code 44

    Yes. An o2 sensor isnt just for emissions. Its used for maintaining optimum air/fuel ratio in real-time. It could also just be notifying the computer of lean operation due to some other issue like a vacuum leak...

  4. #3
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX, 2009 Chevy Malibu 2LT
    Join Date
    Oct 2004
    Oak Creek, WI

    Re: Oxygen Sensor Code 44

  5. #4
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003

    Re: Oxygen Sensor Code 44

    Or the fuel pressure is too low which will show as too lean. The code never tells you what to replace but what system of the car to diagnose. If the sensor is original it would not be premature to replace it, but I doubt thats the issue. Be aware the filter inside the tank has a filter ( sock) that over the years plugs up with debris and eventually wears out the fuel pump. Mine did that last year with 90,000 miles on the odometer. A failed oxy sensor would normally set a rich not lean code.

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