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Home >> Hyundai >> 2011 >> Elantra Limited >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) >> DTC P2096: Post Catalyst Fuel Trim System too Lean (Bank1) >> Inspection/Repair >> Component Inspection

Component Inspection

  1. Visually/physically inspect the following conditions:
    • Exhaust system between HO2S and Three way catalyst for air leakage, restriction and damage.
    • Damage, and for loose or missing hardware.
  2. Was a problem found in any of the above areas?

    YES 

    Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    Go to next step as below.

  1. Visually/physically inspect the three-way catalyst (TWC) converter for the following damage:
    • Severe discoloration caused by excessive temperature.
    • Dents and holes.
    • Internal rattle caused by a damaged catalyst.
  2. Also, ensure that the TWC is a proper original equipment manufacturer part.
  3. Was a problem found?

    YES 

    Replace TWC and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    Go to next step as below.

  1. Visually/physically inspect the HO2S for the following conditions:
    • Ensure that the HO2S is securely installed.(Pigtail and wiring harness not making contact with the exhaust pipe)
    • Check for corrosion on terminals and terminal tension (at the HO2S and at the PCM)
    • Front HO2S for 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. Warm up the engine to normal operating temperature and let it idle.
  3. Connect GDS and monitor the "O2 SNSR VOL.-B1/S1" and "O2 SNSR VOL.-B1/S2" parameters on the GDS data list.

    Specification:  Refer to "SIGNAL WAVEFORM&DATA " in the "General Information" procedure.

    • Front HO2S (O2 SNSR VOL.-B1/S1): Verify signal is switching from rich (above 0.45V) to lean (below 0.45V) a minimum of 3 times in 10 seconds (voltage will vary between 0.1 and 0.9V) at idle.
    • Rear HO2S (O2 SNSR VOL.-B1/S2): Above 0.6V at idle.
  4. Was a problem found in any of the above areas?

    YES 

    Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

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