DTC P2097 [LF]: Notes

DTC P2097 (LF) DETECTION CONDITION AND POSSIBLE CAUSE

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 less 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 malfunction 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 the first drive cycle. FREEZE FRAME DATA (Mode 2/Mode 12) is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Leakage exhaust gas (between TWC and HO2S) HO2S malfunction IAT sensor malfunction Erratic signal to PCM ECT sensor signal malfunction MAF sensor signal malfunction TP sensor signal malfunction VSS signal malfunction Leakage exhaust gas (between exhaust manifold and A/F sensor) A/F sensor malfunction Excessive fuel line pressure Fuel pump unit (pressure regulator) malfunction Purge solenoid valve malfunction Ignition system malfunction Spark plug malfunction Ignition coil malfunction Ignition coil related wiring harness malfunction Fuel injector improper operation Fuel injector malfunction Fuel injector related wiring harness malfunction Insufficient engine compression ECT sensor malfunction PCM malfunction

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 less 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 malfunction 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 the first drive cycle.
FREEZE FRAME DATA (Mode 2/Mode 12) is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

Leakage exhaust gas (between TWC and HO2S)
HO2S malfunction
IAT sensor malfunction
Erratic signal to PCM
- ECT sensor signal malfunction
- MAF sensor signal malfunction
- TP sensor signal malfunction
- VSS signal malfunction
Leakage exhaust gas (between exhaust manifold and A/F sensor)
A/F sensor malfunction
Excessive fuel line pressure
- Fuel pump unit (pressure regulator) malfunction
Purge solenoid valve malfunction
Ignition system malfunction
- Spark plug malfunction
- Ignition coil malfunction
- Ignition coil related wiring harness malfunction
Fuel injector improper operation
- Fuel injector malfunction
- Fuel injector related wiring harness malfunction
Insufficient engine compression
ECT sensor malfunction
PCM malfunction