Just as the title states. How do you reset the check engine/maintence lights without disconnecting the battery? Is there a code that can be pressed on the dash?

 

Well the check engine light is telling u there's something wrong, and if u originally fixed the problem it shouldn't be on anymore, but the code will still be there. As far as the maint. I know for integras that there's a button u push underneath the dash on the driverside, it's blue, and I know this is at least true for integras not sure for accord, u could try looking, and if it's not there, then try searching in archived. Also, since ur ecu is obd2 I think the only way to reset it is to use a code checker, u can go to autozone an have them reset ur ecu. That's the only way I think u can reset the ecu for obd2, I'm not 100% sure though cause I have an obd1 ecu and this is what I here from ppl here on H-T.

 

to reset the ECU just remove the clock-back up fuse from the under dash passanger side fuse box ,, fuse # 13 7.5 amps , for at least 15 seconds

maint lite,
hold the select/reset button down, turn ign key on, keep holding button down for about 20 seconds ,,,,,,,lite will clear

 

Thanks Honda-Master, that's what I was looking for.

 

Removing fuse 13 for 15 seconds does not work on my 2002 Accord LX with 4-cylinder V-tech engine. Fuse no. 13 is labeled "Start Signal." and is 7.5 amps. I tried removing it for 15 seconds with the ignition off, with the ignition on, and with the engine running and Check Engine Light on. After turning ignition off and restarting, the light remained on. Guess I have to disconnect the negative battery cable. All that I have ever lost this way is the radio presets.

You may like to know however, that the Check Engine Light codes can be read the old-fashioned way on this 2002 model, by interpreting the blinking of the light. I just diagnosed my faulty Oxygen Sensor from a code 41 in the blinking lights. A lot of people think this capability was lost after the switchover to OBD II, but it still works in 2002, and may even apply to later models. Here's a video on how to do it on an earlier model, but the procedure was precisely the same on my 2002

 

My mistake. Removing Fuse 13 on the passenger side for 15 seconds did the trick. I was looking on the driver side, because I didn't know there was also a fuse panel on passenger side.

Just replaced the upstream oxygen sensor on my '02 Accord LX 4-cylinder. The trick was I have the ULEV (ultra low emission vehicle) model. This takes a more sophisticated and expensive sensor. I first tried installing the non-ULEV which is Denso Part No. 234-4620. But the wiring harness is too short, and it has different electronic response. You need the Denso Part. No. 234-9014 for the ULEV model. Presently costs $145 on Amazon and $300 at the parts stores. It's very easy to tell if you have a ULEV engine. The letters ULEV are imprinted right on the top of the engine. Saw it a thousand times, but never knew what it meant.

Anyway, job is now complete. It's very easy if you have the right part. My front sensor came out with a turn of a 7/8-inch wrench--no special tool required (88,000 miles on the car). Takes longer to undo the connector than to remove the sensor. Hope this helps others.