Please make sure the Part number in our listing is the same as your original one. This can easily lead to errors. Our product requires professional installation and disassembly. If the installation is damaged, we are not responsible for after-sales service!! Before replacing the fuel injector, please replace the fuel filter, clean the front oil pipe of the injector, and check if the oil pump is working properly. This product requires professional installation, and we are not responsible for any damage to the injector caused by installation. Product Information:Part Type: Fuel Injector. Fuel Type: Diesel Material: Metal Item Condition: Aftermarket Part Way of Use: Direct Replacement Reference Number: 5521671 0445120568 All Injectors are completely end of line tested using the exact OE test equipment and specifications. Manufactured with the latest engineering updates so often times it is superior to the dealer channel product. Manufactured using all OE tools and process to provide guaranteed factory performance. Each critical component is re-surfaced or replaced. Attention: Reliability – The parts are excellent and fast after-sales service. Parts Updates – According to the original factory specifications manufactured, tested.