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I just recently had my Check Engine Light come on in my `91 CRX, so I have stared to find what I need to look into. And the manual seems to say that the light may come on for: (keep in mind this for many modles from `88-`91, So they may not be in the `91 CRX) Oxygen Sensor Manifold Absolute Presssure Sensor TDC/Crank Sensor Coolent Temperature Sensor Throttle Angle Sensor Intake Air Temperature Sensor Atmospheric Pressure Sensor Ignition Output Signal Vehicle Speed Sensor Lock-Up Control Solenoid Valve Fuel Injector EGR Control System (Cal. A/T only)

If you pull down the passenger-side floor mat from the top, you'll expose the computer. In the middle of it's housing there's a sight window. Turn on the ignition key and a light will blink indicating the code(s) set. Just count the blinks for the first digit, followed by an obvious delay; then count digits again. If more that one code is set, there will be a yet longer delay between each code. This will repeat itself continuously, so you'll have plenty of time to figure it out.
Then you have to get a list of the codes somewhere.

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โˆ™ 2007-08-01 16:54:15
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Q: If the check engine light on a 1991 crx is coming on but you just changed the o2 sensor what else could be the problem?
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