I had the procedure done at dealership yesterday but was late when I picked up vehicle so could not ask purpose of the ECU tune. Anyone know why they did this?My service manager worked me in today to do this action, Q514. The service writeup after shows there was not an O2 sensor replacement, but an ECU tune for management. my wife has the write up with her, but ill post a pic of it when I get home.
+1The Q514B campaign updates the ECU tune to prevent the check engine light from coming on due to an issue with O2 sensors. It is not a sensor replacement, just an ECU tune. If you have an aftermarket ECU tune this will erase that calibration file and you will need to reflash your ECU to restore the tune.