Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1987 Acura Integra LS, 2D Hatchback, AutomaticFACTORY OEM SERVICE PROCEDURE
Code 1 & Code 2 - Oxygen Sensor
- Turn off ignition and reset ECU. Remove hazard fuse at battery terminal for 10 seconds.
- Bring engine to operating temperature (cooling fan on). Hold engine at 1500-2000 RPM for 10 minutes, without closing throttle completely during this time. Check if PGM-FI light is on. If not on, test drive and check light again.
- If light is on, check fuel pressure at fuel filter. See appropriate FUEL INJECTION article in this section. Repair fuel system if not within specifications. If fuel pressure is within specifications, proceed to next step.
- Disconnect oxygen sensor connector. Attach voltmeter to vehicle ground and connector. With engine at normal operating temperature, open throttle wide open then close throttle.
- Voltage at wide open throttle should be above .6 volt and below .4 volt at full closed throttle. If not within specifications, replace oxygen sensor. If voltage is within specifications, proceed to next step.
- Turn engine off and attach system checker harness between ECU and connector. Using a voltmeter, connect negative terminal to connector terminal No. A18. Attach positive terminal to connector terminal No. C16.
- Start engine and warm to operating temperature. Open throttle wide open then close throttle. Voltage at wide open throttle should be above .6 volt and below .4 volt at full closed throttle. If not within specifications, repair wire between ECU and oxygen sensor. If within specifications, proceed to next step.
- Install a known good ECU and recheck system. If failed system is now corrected, replace ECU.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.