I did a tune-up for my 3-cylinder Corolla and found that one injector was not working properly. I had to buy a replacement. The dealership price for an injector is 2000 SAR, and after discount, it's 1300 SAR, which is very expensive. I went to the junkyards and after a lot of searching, I found them, but they refused to sell just one injector, insisting I buy all three together. I bought them for 800 SAR, and thankfully, I installed the replacement injector and it worked perfectly. I have two injectors left. Whoever needs them can contact me, and I'll be happy to help.