I need some help real bad. My check engine light came on one day after my car started to run badly out of the clear blue. In a panic I took my car to an R&S Strauss shop that is right down the street from my job. When I got my car back from them the check engine light was out and the car ran and still runs great. The strange thing about all of this is they said they couldn't find anything wrong with my car. This happend in April and last week when I took my car in to be inspected at the service station for the emmisions test they said they can't get a code reading from the on-board diagnostics for the emmisions system. They asked me did I recently disconnect the battery and I told them no. I have a 2004 honda accord sedan lx with a 4cly. and the owners manual say that in order to see if the readiness codes are set, you have to turn the ignition to the on position without starting the engine. If the check engine light comes on for 20seconds and goes off the readiness codes are set. If the check engine light blinks 5 times then this means the codes are not set. I was told to drive the car on the highway and after a few days of normal driving the codes would be reset. I've done this and I still get the check engine light blinking 5 times when I go to see if the readiness codes have been set. Can anyone let me know if this would be an expensive problem to fix if I took my car to the dealer to have the codes reset in my car? Is this something I can do myself? Can someone out there help me,because with the way the economy is I really can't afford to take my car to the dealer right now. What do I do about this. Please someone respond quickly. Thank You, Kenya99  

I have a similar issue with a 2004 Honda Odyssey.

I was asked the same question "did I disconnect the battery".  I was told to go through a drive cycle of highway and local driving and to go back.  We have been back twice with the same, no codes.

did you get it resolved?  

Have you guys tried to actually disconnect the battery first, then drive it around? Doing so will rest the Ecu and all your codes may come back.  

Oh and be sure to have your radio codes handy