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P0131 A/F SENSOR 1 EC-203 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] C D E F G H I J K L M A EC N P O 4. Check harness continuity between ECM terminals 45, 49 or A/F sensor 1 terminals 1, 2 and ground. Refer to Wiring Diagram. 5. Also check harness for short to power. OK >> GO TO 5. NG >> Repair open circuit, short to ground or short to power in harness or connectors. 5. CHECK INTERMITTENT INCIDENT Perform GI-42, "Intermittent Incident" . OK or NG OK >> GO TO 6. NG >> Repair or replace. 6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1 Replace air fuel ratio (A/F) sensor 1. Refer to CAUTION: • Discard any air fuel ratio (A/F) sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one. • Before installing new air fuel ratio (A/F) sensor, clean exhaust system threads using Heated Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial service tool). >> INSPECTION END A/F sensor 1 terminal ECM terminal 1 45 2 49 Continuity should exist. Continuity should not exist. |