LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Kia >> 2015 >> Forte LX, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) - 1.8L >> DTC P2187: System Too Lean At Idle (←Additive) (Bank 1) >> System Inspection >> Sensor Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Sensor Inspection

  1. Visually/physically inspect the front HO2S for the following conditions:
    • Ensure that the HO2S is securely installed.
    • Silicon contamination. This contamination will be indicated by a white powdery coating on the portion of the sensor exposed to the exhaust stream and this will result in a but false (high) voltage signal
    • Fuel, engine coolant or oil contamination
    • Use of improper sealant
    • If contamination is evident on the HO2S, Fix the source of the sensor contamination before replacing the sensor to prevent future contamination. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  2. Visually/physically inspect the MAFS for the following conditions:
    • Contamination or deterioration
    • Poor connection or damaged harness
  3. Check for an intermittent TPS1 false signal. TPS1 signal displayed on a GDS should increase steadily when depressing accelerator pedal after starting.
  4. Verify that the PCM/ECM ground connections are clean and properly tightened.
  5. If test result is NG, repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure. If OK, go to next step as below.
    NOTE: If the contamination is evident on the HO2S or MAFS. Fix the source of the sensor contamination before replacing the sensor to prevent future contamination.
scientia non olet · About LEMON Manuals