My "service engine soon" light came on and they told me that they had to re-program the ECM module. The Consult device flashed a code of "P0420". Anyone know what this code means? Anyone had this done ?

 

:spock voice: Logic dictates that your answer or a link to your answer might be in one of the stickies in this or other forums. If not, the logical 2nd choice is to use the search feature. In either case, you will end up wiser for the excercise. Live long and prosper. IVI

 

I remember someone complaining about the same problem and the service dept reprogramming the ECU... so I guess it has happened before

 

they reprogramed mine when i went in for the service engine soon light. but they also changed my o2 sensors.