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TEST ACTION APPLICABILITY 4 Check the exhaust for excessive smoke from internal oil or coolant leaks. All Yes → Repair engine mechanical condition as necessary and replace No → 5 NOTE: A new Downstream O2 Sensor along with an aging Upstream O2 All Yes → Replace the appropriate Upstream Oxygen Sensor. No → 6 If there are no possible causes remaining, view repair. All Repair Replace the Catalytic Converter. 121 DRIVEABILITY - GAS P0420-1/1 CATALYTIC CONVERTER EFFICIENCY — Continued |