Have Honda Questions? Ask a Honda Repair Expert.
If it's a P0135, or a P0141, just replace the sensor. These are both heater circuit malfunctions. We do a lot of them. Do't buy aftermarket. Honda computers do not like splices or badly manufactured parts.
On a 4 cyl. the O2 sensors sre both at the catalytic converter. The HO2S S1 is closer to the engine, the HO2S S2 is after the S1.
What code exactly do you have?
I do. Only because I have had to replace the aftermarket ones before, and they don't last very long for some reason. Every time I have replaced one, my custmer tells me they just replaced it 6 months ago. Generally speaking, Honda cars don't like much of anything afftermarket.
I also checked on warranty extensions, but there are none for this problem.