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2011 ACURA RL
3.7L V6•AWD•AUTOMATIC•gas
6 active safety recalls on this vehicle — view recalls
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Repairs0Labor479Torque4166Fluid7DTC1898Battery1Maintenance0Recalls6
P1173moderate severityPowertrain

Air Fuel Ratio (A/F) Sensor Circuit Malfunction

on 2011 Acura RL 3.7L V6 · AWD

What this code means

The wideband air/fuel ratio sensor circuit is faulty, so the ECM can't accurately trim the fuel mixture. Similar in function to OBD generic P0130-series O2 sensor codes.

Symptoms

  • Check engine light on
  • Poor fuel economy
  • Rough running or hesitation

Common causes

  • Failed A/F ratio sensor
  • Damaged sensor wiring or connector
  • Blown sensor heater fuse
  • Faulty ECM

Diagnostic steps

  1. Scan and confirm P1173 with freeze frame
  2. Inspect A/F sensor wiring and connector
  3. Check sensor heater circuit resistance
  4. Test sensor signal against known-good spec
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