i start up my car this morning, CEL. code 0.. try driving it, yeah right... so i shut it off. turn it back on... it's fine. while driving to work, i'm looking at the ECU... it's blinking in random patterns untill it just starts blink code 23, knock sensor... no check engine light? all the way to work, doing 90 mph.. and no check engine light? turn the car off, then back on...... no check engine light? strange....... how come? does anyone know? could i just really have a bad ECU?

 

reset the ecu and see if it throws anymore codes

 

ok

 

i have the same problem. i am throwing code 23 as well (knock sensor), and sometimes my check engine light comes on, and sometimes it doesnt. i am going to get my car up on the lift after work at honda and check my knock sensor as well.