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O2 sensor problem

they check engine light was on so i borrowed a friends scan tool to discover whats wrong. i got a thing that said p420 which is the code for the front oxygen sensor. i replaced the sensor yesterday and the check engine light went off for several hours however then turned back on. i used the scan tool again and once more it said no different error front oxygen sensor...what other thing can i do besides take it to a mechanic.???
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If I dont change my O2 sensor right away what could happen?

My check engine light came on. The guide says it means there's something wrong amongst emission programme. My buddies say it's most likely the O2 sensor and it would cost about $300 bucks. If I dont change it whats the worst that could happen?Second part of my question is.. What other things could be wrong to create the light go on?
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Oxygen Sensor of Honda Civic LX 2003 (sedan style)?

Dear all,I would prefer to ask about oxygen sensor matter of my auto, and hopefully, somebody will point out a solution. My question is: I know my car have 2 oxygen sensor (one in the front and one in the rear). However, I can't locate the rear one. If anybody know about it, then you should assist me out. The solution would be better and understandable if you provide me amongst picture.Thank you in advance,Thank you for replying to me. Here is the extra details: 1. When I went to AutoZone shop to ask, the guy in there showed me the picture which telling me my car have 2 oxygen sensor. Plus, I've noticed this by looking 2 wires running along (one is connected to the front and one is connected to the rear). The picture show is very clear, however cannot located. Is it weird? 2. About changing, I think changing the front one is a lot lot more easier compared to the rear.
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