2015 Volkswagen Golf — costs that mattered more than fuel economy — anyone dealt with this recently?

Start with the test that can prove you wrong. Move a coil or plug on the 2015 Volkswagen Golf if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. This is from a 2015 Volkswagen Golf in Philadelphia. A shop burned me once by skipping that step. This is me being the wet blanket on purpose.