If you’re experiencing prevalent knocking noises in your engine and increased oil consumption, as well as low oil pressure, your connecting rods might be going bad. Pick up these four replacements for your TDI ALH engine if any of the previously mentioned symptoms are occurring. This is a set of four rods, as singles are not available. When the connecting rods go, chances are your main bearings are bad as well. Be sure to replace those when you work on your rods as well.