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P0431 Diagnostic Trouble Code Discussion for January 2008

Warmup Catalyst System Efficiency Low (Bank 2)

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Trouble Ticket Help Requests for DTC P0431
Help Request Posted
2006 Jeep Wrangler Unlimited 4.0L MIL Lamp on VIN: 1J4FA44S46
P0431: Catalyst Efficiency Below Normal (Bank 2). ... went bad, we've installed a jasper engine. The Check engine light is coming on with code P0431, we changed ox sensor Bank 1 Sensor 2, but after driving a few miles the light comes on. The customer stated it actually started just before the engine went bad....
January 08, 2008