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From : budd cochran

Q: i have a 97 ram 1500 5.9l 4x4 70000 miles and the check engine lights comes on when the fuel level is below a quarter of a tank. the truck wont idle right when the check engine light is on. the mil code is 21 which is telling me the left o2 sensor needs replacing. i am hoping that someone can tell me if this sounds like the right symptoms for an o2 sensor. i guess i am cheep because i dont want to shell out a $100.00 if it wont fix it. to me it acts like a fuel pump. thanks larry .