O2 sensors
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Freshman User
Joined: Nov 2005
Posts: 34
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O2 sensors
Can O2 sensors start going bad without throwing an engine code? Would the front two sensors make the motor run poorly and the back two make the exhaust sound funny?
I was also thinking of changing the spark plugs sometime soon which might help.
I was also thinking of changing the spark plugs sometime soon which might help.
Senior User
Joined: May 2003
Posts: 285
Likes: 0
From: Maryland
My last truck (a foreign model) had the O2 sensor going bad. Would run for a week or two, throw a code, reset and it would run for a week or two before throwing the code again. But when the sensor started to go bad, the MPG dropped -- a lot.
Cargo Master
Joined: Aug 2002
Posts: 2,013
Likes: 6
From: Cajun Country
I replaced my front two O2 sensors at 100k miles (123k currently) and had a dramatic increase in gas mileage.BTW,no codes were present.I think O2 sensors get "lazy" but will not throw a code. 
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Freshman User
Joined: Nov 2005
Posts: 34
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Ya I looked at the front two sensors today, and they dont look easy to replace especially the one on the passenger side. A lift would be nice! If i get some ambition Ill get it done along with the spark plugs.
Posting Guru
Joined: Feb 2001
Posts: 1,514
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From: Maple Grove, PA
mine went in my truck.....they also seamed to get lazy.....then throw a code becaue i started to see a gradual drop in MPG then all of a sudden WHAM down to 8 mpg......i normally get 18 so that was a gradual drop to 14 then down to 8 then the codes came......good luck.....the heat makes them a real pain in the A$$ to get off sometimes.....
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Freshman User
Joined: Nov 2005
Posts: 34
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Ya i really think I want to change the front o2 sensors. Anyone have advice on doin this? The drivers side doesnt look to bad, but the passenger side looks like a PIA!!!!
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