sh0rt1e67

so my check engine light has been on for a week. i checked the gas cap and i took it to aamco for a diagnostics check and they said everything is normal. is there ant other reason why it might still be on ?!?!?

Former User

Remove the 7.5A BACKUP fuse under the hood for 1 minute and then reinsert. This will clear the ECU and should make the CEL turn OFF. Drive the car to see whether the CEL turns ON again. If so, then retrieve the CEL code yourself as described here.

ivicr

what code is it throwing ?

sh0rt1e67

cool.... i have the original honda motor and when i bought the car i didnt get the radio code i know if i unplug the battery i will need the code to start the readio again ...will removing this fuse affect that?!?!?!?

sh0rt1e67

aamco said they couldnt get a code ...i saw it myself and it would just flash with long pauses in between...they told me thats normal...

Former User

Yes

Former User

They are wrong -- CEL codes were being flashed. Don't take your car back there. Click the link.

sh0rt1e67

i figured since they were doin it for free they didnt wanna do much work....cause right next to me a guy was getting the same thinig done to his 96 civic ex and they gave him the problem...the only difference is I saw them plug a machine into his ecu and they didnt even do it to mine

sh0rt1e67

but thanx for the link...ill make sure to check first thing in the morning

sh0rt1e67

kk so i tried to check it myself by following the instructions on the link....i got the light to flash but it never stopped flahing...i counted up to 30 then i just quit.... any other advice?!?!?
also...am i counting how long the flash is or the gap in between each flash ?!?!?

Former User

Code 1 or 10. Were the flashes long or short?

sh0rt1e67

each flash was about 1 second long .....about 2 second delay in between each flash

shailoche

If you follow the simple and direct instructions that were included by RONJ@HT you would know that you have to add the two types of flashes together. In this example if the long light flashes are the periods and the short flashes are the arrows you add them up. So, ... >>>>>> would be 36. Get it. Add the short and long flashes together to get the code.

If you get just 1 short flash then it is the O2 sensor. If you get 2 long flashes followed by 3 short flashes they add up to 23 and it is the knock sensor.

Depending on the age of your car and the mileage there are some likely culprits. The oxygen sensor goes out with 60,000 to 100,000 on the car. When that happens you may not even notice it has stopped functioning.
If your car is overheating it could be the coolant temperature sender.
If your speedometer or tachometer aren't working it could be your VSS (variable speed sensor.)
If you have had really bad gas mileage lately it could be the fuel system is running lean or more likely rich.
But you really have to be able to follow the basic instructions given. If you are having a hard time reading the codes then go to your local Honda dealership mechanic and have them read the code for you. Most dealerships will do it for free since it takes only a couple of minutes and they are likely to get your business for doing it.

Otherwise, you just have to be patient and try. Also, the ECU can keep multiple codes. So, if you have several things going on you will notice that there is a pause between the codes which is longer than the 2 seconds of the long code. Also, your code will keep looping. So, if you have only one code stored the ECU will flash that code and then wait for a few seconds and then start flashing the same code again. So, if it seems like your ECU is flashing the same type of codes over and over then it is likely that it is just cycling through the same code.

hOnda_hiEn

its either code 1 or code 10.. depending on how long your flash is.. the code will repeat itself as it cycles around so it'll just keep flashing..

sh0rt1e67

kk so where would the oxygen sensor #1 (OA2) b located...is that the one that is between the headers and exhaust by the cat on a 99 ex coupe

Former User

If your 99 EX is like my 00 EX, then your exhaust system and the location of the primary O2 sensor is shown below:

sh0rt1e67

awsome...thanx 4 all the help...ill b replacing the sensor soon
ill keep u guyz posted with the updates.....