Check engine light in 2000 Honda civic Si?

Check engine light 1990 Honda Civic Si?

• Check engine light at highway speeds on 1990 honda civic si? Check engine light comes on and off..As the question above states, i have done a complete tune up (oil, plugs, wires, pcv, fuel filtr, etc) and i dont know what is wrong. I CANNOT GO TO AUTOZONE for them to run codes because it is illegal for them to do it in California, so thats out of the question. What could be the problem? Anyone had the same problem before? Any info would be good.... I dont know if i am reading the flashes right because it never stops...my mechanic jumped it and found a code (O2 sensor) and fixed it...now cel only comes on when on highway...i bring it to mechanic, he says dont turn off the engine so he could get the code but my car wont open the doors with keys in the ignition FYI Autozone in California (or Long Beach, CA) cannot run codes and scanners into anyone's car anymore...it is California law, and every autozone I went to said the same thing...

• Answer:

  Fortunately, in your 1990 Honda you can do it yourself! See pages 16 - 25 of the pdf (the pages are numbered differently). The specific procedure is at the bottom of page 18. You don't need a shorting jumper, just turn the ignition on and look at the flashing lights. I paid $35 a few years ago for this manual in printed form, two shorting tools and a plastic screwdriver. Oh well. Thank you very much for the information on reading codes in California. I suspected it was illegal based on feedback from other people who tried to get their codes read in California, but this is the first actual confirmation I have seen.