Subject regarding engine control module (ecm) calibration update - malfunction indicator light on with diagnostic trouble codes P0420 or P0430 and enhanced engine performance. *tt
Related OBD-II Error Codes
Vehicles impacted by this bulletin may show the following OBD DTC.
P0420 [1] Catalyst System Efficiency Below Threshold (Bank 1)
P0430 [1] Catalyst System Efficiency Below Threshold (Bank 2)