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 P1164: Air/Fuel Ratio Sensor Range Performance Problem (Sensor 1)
2004 Acura 3.5RLSECTION DTC P1164: Air/Fuel Ratio Sensor Range Performance Problem (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.
- 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. Check for temporary DTC with scan tool.
- If temporary DTC P1164 is not set, go to next step. If DTC is set, replace Air/Fuel Ratio (A/F) Sensor.
- Test drive in position "D3" (M/T in 3rd gear). Starting at 1600 RPM, accelerate using Wide Open Throttle (WOT) for at least 5 seconds. Then decelerate for at least 5 seconds with throttle completely closed until readiness code or temporary DTC P1164 comes on. If temporary DTC P1164 is set, replace A/F sensor. If temporary DTC is not set, problem is intermittent. System is okay at this time. Check for poor connection(s) or loose wire(s) between C101 20-pin connector (under right side of dash), C401 24-pin harness connector (under left side of dash), A/F sensor relay 4-pin harness connector, A/F sensor 4-pin harness connector and Gray ECM/PCM 31-pin "A" harness connector. See Figure , Fig 1 , Fig 2 , Fig 3 and Fig 5 . See appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS.
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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.