Here's the deal: My car is a 1990 Civic 4 dr. LX, the check engine light comes on. What seems to make it come on is when I'm in the mid rpm's (over 2200-2500 ish) for an extended period of time, say over 10-15 seconds. It typically comes on when I'm climbing a hill at "around town" speeds and when I get on the highway. I don't feel anything change with the car when it comes on.
My ECU is flashing once, then a 3 second pause, then once again, then a 3.5 second pause, and it repeats that sequence. The legnth of both flashes are the same.
What does this code mean? If anyone needs more info please ask.

 

sounds like code one,
replaced the O2 sensor ever?
stan

 

Yes my O2 sensor has SUPPOSEDLEY been replaced by the dealership that I bought the car from. I sent the car back after buying it from them because it had a bad distributor, it was under warranty. I told them the ECU was sending bad O2 sensor and bad distributor codes. They told me they replaced both items. Now I know they replaced the dizzy because the car not sputtering and stalling and in limp mode anymore, and I can see it visually that its been replaced, of course. But did they really change the O2 sensor? Who knows...

 

well you might be able to see the new o2 sensor. but the code is actually o2 sensor/content i believe.

Try re-setting your ecu as per the manual.

 

the 02 sensor should be going into your exhaust manifold right by the transmission. pull the neg. cable off the battery for 10 seconds to reset the ecu.

 

Unfortunatley my Civic didn't come with the manual, it had a manual for an 86 Camry in it though I never would have guessed an 86 Camry might be packin factory BOOST! Anyway, I'll reset the ECU and let you guys know what's up...thanks again.