DTC Troubleshooting

DTC TROUBLESHOOTING CHART

Step	Action	Yes	No
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2.	Go to "ENGINE AND EMISSION CONTROL SYSTEM CHECK ".
2	Exhaust system visual inspection Check exhaust system for leaks, damage and loose connection. Is it in good condition?	Go to Step 3.	Repair or replace.
3	HO2S-2 output voltage check Check output voltage of HO2S-2 referring to Step 2 of "DTC P0137: 02 SENSOR (BANK 1 SENSOR-2) CIRCUIT LOW VOLTAGE ". Is check result satisfactory?	Replace three way catalytic converter.	Check "RED/BLK" and "GRY/YEL" wires for open and short, and connections for poor connection. If wires and connections are OK, replace HO2S-2.

Step

Action

Yes

Was "Engine and Emission Control System Check" performed?

Go to Step 2.

Exhaust system visual inspection

Is it in good condition?

Go to Step 3.

Repair or replace.

HO2S-2 output voltage check

Is check result satisfactory?

Replace three way catalytic converter.

Check "RED/BLK" and "GRY/YEL" wires for open and short, and connections for poor connection. If wires and connections are OK, replace HO2S-2.