Rep Power: 0

Recently I got the Check Engine light on in my 2003 Honda Civic. After
replacing the oil and filter it did not go. Someone told me to disconnect
the battery for few minutes and reconnect would get rid of this light. Now
after this I got the message on the display to enter the code. I bought
this as used car and manual did not come. I tried several codes and now
it just shows "Error 7" and nothing (radio, CD or clock) works.

Does any one has any idea about the remedy?

Thanx in advance for the help.

 
Rep Power: 237

You'll have to get in touch with a dealer to fix that. It's a security feature if the radio is stolen.

Also, in the future, when your Check Engine Light comes on, go to an auto place and they'll usually scan it for free (or for very cheap) to tell you what is actually wrong. There's a good chance it will come back.

As for changing your oil, that's actually the Maintenance Req'd Light, which comes on every 10k I believe. So, it's good that you changed your oil, but it won't take away the CEL.

 
Rep Power: 291

security code should be in the glove box for the radio. and ditto going to auto zone or advance auto and getting the check engine code checked for free.

 
Rep Power: 0

gr8 info guys... never knew about the free check, and here i was always bringing my rides to the stealership for this...

 
Rep Power: 244

if his car went into limp mode then the CEL would be on and changing the oil would fix it. still good to have it scanned tho

 
Rep Power: 282

somebody said you can also find the radio code on the underside of the engine bay fusebox lid....not sure if that's true or not though