what is code p219 on 2005 Ford Expedition

engine light is on

Asked by for the 2005 Ford Expedition
There is a p0219; Engine speed over limit. It means the programming in the PCM is set to a RPM limit and your truck has exceeded that limit, Possible programming issue in the PCM.
mechanic told me it was o2 sensor bank2/1
There is no p219. I looked up p0219. What is the proper code.
p219 is what he wrote on the note he gave me when he tested it and said it was the o2 sensor. I couldn't find that either that why i asked here.
Take it to a parts store and have it scanned again.
my bad, hard to read his writing . it was p2197 code, bank 2 sensor 1
Lack of switching. Indicates lean condition.