Kia Sedona catalyst warm-up code?

2003 Kia Sedona, 4.3L 6 cylinders, 117.000 miles, 3,000 miles regular oil and filter, and the transmission fluid filter / air filter change, maintenance of engines. Twice the engine light came on. Code is "hot to the efficiency of catalyst below the threshold. "Both cars were driven over an hour after leaving the highway (high speed of 65 mph), just after the hand loop ramp (slow to 30 km / h), the engine light came on. What should I check / Replace the first? ManassasRalph

Concern Customer: P0431 Tests / Procedures: 1. Monitor the front and rear oxygen sensors to drive the vehicle about 55 kilometers per hour. oxygen sensors should always take into account-cons 8-10 times every 10 seconds. 2. Monitor fuel versions to be normal at rest and at 55 km / h constant cruising. 3. Check that the input temperature Catalytic converter output. In general the back should be 50 degrees or warmer: Potential. Causes of faulty oxygen sensor catalytic converter technology Tips: You can save the catalytic converter on the ground a spark plug wire and the engine to 2,500 rpm for 2-3 minutes. Increasing catalytic converter temperature sometimes can bring in good working condition. Always replace the oxygen sensor before, when a P0420 code was created. The oxygen sensor is what makes the job properly catalytic converter.

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