The Following below admin setting required to add Google AdWords Code in Magento 2 Store.
Step [1] – Go STORES > Configuration, redirects Configuration section.
Step [2] – Left panel, choose SALES > Google API
Step [3] – Right panel, Expand the AdWords section.
To Enable select Yes, after uncheck use system value
Enter the Google Adwords ID Conversion ID filed
Step [4] – Click on Save Config button & run CLI command Flush