The P219a and P219b are coming on because of the colder temperatures, from what it looks like. SCT is working on adding the ability to keep the code from popping up and we should have something to fix it within the next week.
This code can happen on any SCT custom tune from any company, and it's not an actual problem in the tune or harmful to the performance of the vehicle. It's a very temperamental sensor and colder temperatures don't help them read accurately. It may not be FULLY attributed to temperature, but it's obviously bringing out a few cases. Winter brings out crazy things in cars, from fuel quality being sub-par for winter months to colder temperatures. Either way, this is luckily an easy fix and won't affect driveability, power, safety, etc.
If the code came on for the actual reason it was intended to (because of an air/fuel ratio imbalance), that would affect performance, etc. These cases are all as a byproduct of something else, causing the sensor to believe that is the case.
No big deal, but annoying - I can imagine! We'll have this fixed and update soon!
Chris Rose | AmericanMuscle.com
Toll Free: 866.727.1266 | M-F 9AM-9PM EST | Sat 10AM-4PM EST
Bama Hotline: 888.226.9764 | M-F 9AM-5:30PM EST | Sat 10AM-4PM EST
Free Same-Day Shipping!
Need help? PM AMAlexLazarus for immediate assistance!