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my car has 244000km on it and i have never changed the o2 senser. my car runs great and gets awsome mileage... if and when i due swap the o2 sensors out, which one do you recommend.. the dealership wants 600 for both to me, thats just a whee bit to steep.....

 
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um thats a bit crazy, sensors are not made to last more than 80k miles. what kind of car is this? theres no way the sensors cost that much unless they are wideband which is doubtful. the bosch sensors at the store are exactly the same brand as oem (NTK) and only cost $50-80. your profile says 2003, so you use the regular narrowband sensors. 04-05 switched to expensive wideband. heck even the honda prices i looked up are $59 each. do you have an EX? maybe lx uses a different sensor im not sure.