recently bought a 99 civic DX. BOUGHT it with CEL on and checked it today. shot me 3 codes: P1381 which according to articles is cylinder pos sensor intermittment interruption ( dont know what that means) next codes is P1509 which is considered idle air control valve failure. last one is the one i have most trouble finding out which is P0135 need help!

 

also to add i am a new bee to the civics...

 

Reset the ECU to clear the codes to see if any or all repeat after driving the car.

 

How do i reset ECU?

 

Click the Codes link in my signature.

Is the engine stock or has it been swapped?

 

I was told it was swapped with the same exact motor just from a different car. (d16Y7)

 

After you clear the codes, check what block and head you have.

https://honda-tech.com/forums/showpo...5&postcount=12

Also remove the passenger kick panel to find out what ECU is installed.

 

the link i went to does not say how to reset obII ecu but says how to reset obI, they both reset the same way im assuming? and yes already checked what engine i have it is a d16y7.

 

Same way

 

ok and the 7.5A hood back up fuse? dont know what that is.

 

P0135 is the heater circuit in the top O2 sensor.....the one in the exhaust manifold before the CAT. Check for melted wires. Replace the sensor if necessary.

For the other 2 codes, like Ron said, we need the engine and ECU info.

 

It's labeled on the lid of the hood fuse box.

 

hey guys thanks for the help, it is dark where im at so ill have to do this another day when i have some time on my hands. i will be replying to those post for more help though!