A code popped up today on my truck. It's a P0430 (Catalyst System Efficiency Below Threshold Bank 2). I saw where there was a TSB for Ecoboosts throwing this code but nothing for 5.0's. It runs fine and there is no surging or power loss. Any ideas of what I should check?

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Most common causes are cats going out or a failing O2 sensor. Check the voltage levels on the sensor to see if it's reading correctly. How many miles on the truck? Has it misfired much?

 

Emissions warranty is 8 year/80k. Should be covered, but you better take that tune out and return it to stock before you try to get it covered.

 

Do you run long tubes or high flow cats?