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.
DTC P1163: Air/Fuel Ratio Sensor Slow Response (Sensor 1)
2004 Acura 3.5RLSECTION DTC P1163: Air/Fuel Ratio Sensor Slow Response (Sensor 1)
WARNING: This page is about a different car, the 2003 Acura RSX. However, it is still accessible from the selected car via links, so may be relevant.
If DTC P1162 is stored at same time as DTC P1163, troubleshoot first, then recheck for DTC P1163.
- Perform ECM/PCM reset procedure. See ECM/PCM RESET PROCEDURE/CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM.
- Start engine and hold at 3000 RPM, with no load (in park or neutral), until cooling fan comes on. Test-drive under following conditions:
- 55 MPH steady speed
- A/T in "D4" position (M/T in 5th gear)
- Until readiness code or temporary DTC P1163 and/or P1163 comes on
- Check for temporary DTC P1163 with scan tool. If temporary DTC P1163 and/or P1163 is set, replace A/F sensor. If DTC is not set, problem is intermittent. System is okay at this time. Check for poor connection(s) or loose wire(s) between Air/Fuel Ratio (A/F) sensor 4-pin harness connector and Gray ECM/PCM 31-pin "A" harness connector. See Figure .
RENDER: 1.0x
NO RELATED
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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.