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TEST ACTION APPLICABILITY 1 NOTE: A new rear O2 Sensor along with an aging front O2 Sensor may cause t, read DTCs and record the related Freeze Frame data. Is the Good Trip Counter displayed and equal to zero? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION Symptom (Diagnos- tic Procedure). 2 Inspect the Catalytic Converter for the following damage. All Yes → Replace the Catalytic Converter. Repair the condition that may have caused the failure. No → Go To 3 3 Start the engine. All Yes → Repair or replace the leaking exhaust parts as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 4 4 Check the exhaust for excessive smoke caused by an internal problem in the engine. All Yes → Repair the engine mechanical condition as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 5 5 A new rear O2 Sensor along with an aging front O2 Sensor may cause the DTC to set. All Yes → Replace the Front O2 Sensor as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 6 6 If there are no possible cause remaining, view repair. All Repair Replace the Catalytic Converter. 141 DRIVEABILITY - NGC P0420-CATALYST 1/1 EFFICIENCY — Continued |