Check Engine Light

What is your question?

My car was fine before I had Midas change the front belt on or next to the fan. Now my check engine ligt comes on. I had check the impulse counter for the code located in fron of the battery. The LED blinks 18 "Adjustable camshaft timing solenoid-open or short circuit and 22 times "Cam position sensor signal defective. my question is by changeing the regular belt can cause a code 18 and 22. Thank u. My Zip Code is 19702