thinking about replacing the o2 sensor on my 01 accord. As far as I know it's never been replaced and I'm just sick of this shitty gas mileage. I posted a thread a few weeks ago about it and sense then I've put in a cold air intake and used almost 2 tanks of gas. My first tank was on a road trip up to Tahoe with a full car. I got 19.x MPG My second tank has been around town (all very short trips so the car doesn't even warm up by the time I'm at my destination) and I'm getting like 16 MPG. Going to replace plug wires + O2 sensor.. sound reasonable? Is there any difference between aftermarket O2 sensors or can I safely assume they're all the same.