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Home >> Honda >> 2011 >> Fit Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Advanced Diagnostics >> DTC P0171: Fuel System Too Lean >> Driving Pattern
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Driving Pattern

  1. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on.
  2. Drive at a steady speed between 15 - 75 mph (24 - 120 km/h) for at least 15 minutes, and watch the long term fuel trim. If the long term fuel trim stays at about 1.0, the vehicle is OK or it is a very minor problem. If a significant fault is still present, the long term fuel trim will move up or down while driving.
    • When freeze data is stored, drive the vehicle under those conditions instead of Driving Pattern step  2.
    • If the EVAP monitor runs instead of the HO2S monitor, turn the engine off, then restart it, and the HO2S monitor will restart.
    • After clearing the DTC by disconnecting the battery or using the scan tool, extend Driving Pattern step  2 to 40 minutes or longer to allow time for long term fuel trim to recover.
    • Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
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