Consider buying remanufactured parts. These are parts that have been disassembled, cleaned, and adjusted to perform like new. Remanufacturers have come a long way and, in many cases, are using new components in their product. The quality can be very close to new and they are generally much less expensive than OEM or aftermarket parts, and they are almost always backed by a warranty.
If you can't afford a new part, it may make sense to buy a used (recycled) or reconditioned part. Sometimes, you have no choice because the car is too old or the manufacturer is no longer in business.
Avoid universal parts whenever possible. A universal part is a part that fits more than one type of vehicle, and may require some modification to fit a specific vehicle. While universal parts are usually less expensive, they can be more difficult to install than parts designed for a specific vehicle, potentially adding to the number of mechanic hours you will be paying for.
– Ray Cox is a senior ASE certified technician with AutoMD.com, an online automotive-repair service owned by US Auto Parts Network.
