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California Emission Regulation Applicable Model: Notes

DTC P2097 (LF, L3) DETECTION CONDITION AND POSSIBLE CAUSES

DTC P2097 Target A/F feedback system too rich
DETECTION CONDITION 
  • The PCM monitors the target A/F fuel trim when under the target A/F feedback control. If the fuel trim is more than specification, the PCM determines that the target A/F feedback system is too rich.

Diagnostic support note 
  • This is a continuous monitor. (Fuel system)
  • The MIL illuminates if the PCM detects the above malfunctioning condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
  • PENDING CODE is available if the PCM detects the above malfunction conditions during first drive cycle.
  • FREEZE FRAME DATA is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • Leakage exhaust gas
  • Middle HO2S malfunction
  • IAT sensor malfunction
  • ECT sensor malfunction
  • Front HO2S malfunction
  • Excessive fuel line pressure
  • Fuel pump unit malfunction
  • Purge valve malfunction
  • Insufficient engine compression
  • PCM malfunction
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