Inspection Procedure

1. Connect a Hi-Scan (Pro) to the data link connector.
2. Start engine and warm up the vehicle until the cooling operates.

Does scan tool display DTC P0131?

1. Yes:  Go to next step.
2. No: Problem is intermittent or was repaired and ECM memory was not cleared. See INTERMITTENT PROBLEM INSPECTION PROCEDURE ..

1. Turn ignition switch to OFF position, and then disconnect HO2S and ECM connector.
2. Measure resistance between terminal 1 of the HO2S harness connector and chassis ground.
3. Measure resistance between terminal 2 of the HO2S harness connector and chassis ground.
4. Measure resistance between terminal 3 of the HO2S harness connector and chassis ground.
5. Measure resistance between terminal 4 of the HO2S harness connector and chassis ground.

   Specification (Resistance): infinite

   Fig 1: Checking For Short To Ground In Harness

   Courtesy of KIA MOTORS AMERICA, INC.

   Is each resistance within specification?

   1. Yes:  Go to next step.
   2. No: Repair short to chassis ground in harness.

1. Remove HO2S.
2. Thoroughly check HO2S for contamination, deterioration or damage.

Is HO2S contaminated, deteriorated or damaged?

1. No:  Go to next step.
2. Yes: Clean or replace HO2S.
3. CHECK HO2S
   1. Install a well-known good HO2S.
   2. Connect a Hi-Scan (Pro) to the data link connector.
   3. Start engine and warm up the vehicle until the cooling operates.

   Does scan tool display DTC P0131?

   1. Yes:  Proceed with ECM PROBLEM INSPECTION PROCEDURE .
   2. No: Replace HO2S.