If your vehicle is showing loud squeaking or groaning noise when opening or closing doors, here are the most likely causes and the parts you'll need to fix each one.
Over time, the factory grease on the door hinges and the door check strap dries out or washes away, causing metal-on-metal friction and a loud squeak or groan.
The door check prevents the door from opening too far and holds it open. If its internal rollers or springs wear out or break, it will groan loudly regardless of lubrication.
The pins and bushings inside the door hinges wear down over time, causing the door to sag and groan as the misaligned metal parts grind together.
If the door latch or striker is dry or slightly misaligned (often after bodywork or door panel removal), it can squeak as the door is pulled shut and the latch engages.