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Old 01-01-2004, 04:10 PM   #1
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My car has been kinda hard to start lately especially in the mornings when it'* been in the 0-20 degree temps. Well I figured I would scan for codes and see what I had and I came up with a code 44. Lean O2 sensor. Well I do know that I have never changed it and the car runs ok except it takes a little longer to start when it'* cold. Would anything else besides an O2 sensor give this code? Car runs like a dream except this little problem.
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Old 01-01-2004, 04:47 PM   #2
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Ok I just got through looking at my chilton manual and it says the O2 sensor should read between 350-500 milivolts. Well mine only checked out at 160 milivolts so i'm gonna assume my O2 sensor is probably dead with over 200K miles on it. Time to go shopping for a new sensor.
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Old 01-01-2004, 05:13 PM   #3
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Quote:
What ever you do get an AC Delco sensor....
yeah I definately will. About a year ago I replaced my O2 sensor with a bosch. Drove around with it for about 3 months and it quit on me and I ended up putting the original back in.
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Old 01-01-2004, 07:02 PM   #4
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Happened to pick up a Bosch O2 sensor a while ago and other than it doesn't fit my slotted socket very well, seems to work OK.

That said, an O2 sensor has nothing to do with a cold start, ECM doesn't pay any attention to the readings until the coolant goes over 146F (closed loop). There is also a delay involved since it will ready steady state until the sensor reaches about 600 degrees. Modern cars have self heating sensors (three wire) to speed the process.
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Old 01-01-2004, 08:26 PM   #5
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said, an O2 sensor has nothing to do with a cold start, ECM doesn't pay any attention to the readings until the coolant goes over 146F (closed loop). There is also a delay involved since it will ready steady state until the sensor reaches about 600 degrees. Modern cars have self heating sensors (three wire) to speed the process.
Ok so if the O2 sensor has nothing to do with cold startup what else would give me a code 44? Also I don't have the service engine light on. It just shows up when I pull codes with the code reader. Also I tested the O2 sensor and it shows 160 milivolts cold. The chilton manual says anything between 350-500 milivolts is good. So I'm assumming my O2 sensor is dead.
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