My 2013 Focus check engine light came on and Oriely's OBDII said it is P219A Bank 1 Air-Fuel Ratio Imbalance. This car only has 45,000 miles on it, but uses 1 quart of oil about every 600 miles. No leaks and doesn't smoke any. The Ford dealer couldn't really determine the problem, so they replaced all the valve guides, which made no difference. Any help would be GREATLY appreciated!