Hi everyone! I have a 2011 F150 with a 5.0 Recently threw a code P219B. I feel like it was related to a fill up. That code talks about cylinder imbalance. Any ideas or anybody solved this issue before? Any input would be appreciated! I will also add that I installed a Magnaflow Cat Back. The turndown style before the rear axle. I didn’t find anything in the forums relating to the code though. I reset the code and drive for about 10 miles so far and has not popped back up. Thanks for any input!

P219B - Bank 2 Air/Fuel Ratio Imbalance
Description: The air to fuel imbalance monitor is designed to detect differences in the air to fuel ratio between cylinders per engine bank. This DTC sets when the air to fuel ratio difference per cylinder is greater than a calculated amount.

Possible Causes:

Leaking or contaminated fuel injectors
Low fuel pressure or running out of fuel
Leaking EVAP purge valve
Exhaust or intake air system leaks
Exhaust gas recirculation (EGR) system
Positive crankcase ventilation (PCV) system is leaking
Ignition system
Incorrectly seated engine oil dipstick, tube or oil fill cap
Base engine concerns
.

thanks! I’m gonna start with the easy ones first haha!