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I've read that Honda has a particular warranty in place for emissions issues such as the P0*** codes a check engine light will indicate such as a problem with the O2 sensor. I read on another Honda site for instance that they have a warranty such as this for the S2000 that goes up to 80K, and 6th gen civics were somewhere around 100K but I couldn't find any information on the 7th gen civics. So Honda would be responsible for fixing this problem, for example I have a P0135 code that is coming up for an O2 sensor heater circuit malfunction. Anyone heard of this kind of special warranty and what the mileage is for it? I have an '04 EX with 42K

 
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basically a stock honda comes with a 3 year/ 36,000 mile warranty which covers everything. after that you are responsible. Now I do believe honda also has an emissions warranty that is 8 years/ 80,ooo miles that covers any emission related component. your best bet is to call honda and ask. now if you do have any extended warranty, it should cover it.

 
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here's what I found, looks like you were correct:

Emissions Warranty (years/miles) =
Federal: 3/36,000 and:
8/80,000 (specified major emission control components)
California: 3/50,000 and:
7 /70,000 (specified high cost emission control components)
15/150,000 PZEV*(CA, NY, ME, VT, MA, CT

The question is, what is considered a "specified major emission control component." Would an O2 sensor fit into this category? Because I am beyond the standard 36K warranty, and I don't have extended. I'm going to call tomorrow, I'll let you know what they say.

 
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It basically means stuff like the cat, the evap system, etc... that cost lots of money are covered. As stingy as Honda is, a $50 o2 sensor is unlikely to be covered.

 
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I agree. I don't think O2 sensors fall under the extended emissions warranty.