VDIAGTOOL V200 Pro Automotive Circuit Tester, Power Circuit Probe Tester Breaker Finder Tool, 12/24V Electrical Open Short Circuit Finder, Wire Tracer, AC/DC Trailer Relay Fuse Test for 99% Cars

Must have a lot of stuff but in my opinion here's the most important. Strictly talking diagnostics really. Other have mention a site with service manuals I will skip that. Scan tool with live data and functions (one that bt to your phone are cheapest I have A30m) Digital Multimeter/Oscilloscope combo (1 channel is fine for most people) link at bottom to a 2 in 1. Power probe. Super useful but not 100% needed. With these you can do 99% of diag and then but what you need when you have the problem. For instance if you have a vac leak, buy a smoke machine when that happens. DMM/Osc combo:https://www.amazon.com/SKYCENX-SK201B-Oscilloscope-Multimeter-Capacitance/dp/B0DR7WRRT1/ref=sr_1_4?crid=27B4HSE48YM5P&dib=eyJ2IjoiMSJ9.DBpEIrN0zWxb_P0JwTUFdHGEJgWuUEEf7sRSXYWoHGHl2OIxhIY8wPqBsQZ6g-8VXdg7zZe-ecnLSUm6GpJ9pxd58NmBVH0eieSFxfhfkD_U5F2ilTQRky0IbntXQ9ldiQkUYAgtU2nJsSRy2i8MsJiVyjJzeIUcAy7h3u6t4Xqu4z-1KcMMCgFKnFk8aQAqm0VokGK9e0j_bEWDrFqYMjgYoncky2vtUhbnXWkqmNU.IDnWN5WDhdvpb3Ni54Q2CZ1E5N05VTaKVGYgcutUmwk&dib_tag=se&keywords=dmm+oscilloscope&qid=1780948695&sprefix=dmm+%2Caps%2C182&sr=8-4 A30m Scan tool:https://www.amazon.com/XTOOL-Wireless-Bi-Directional-Diagnostics-Services/dp/B09KT9XNML/ref=sr_1_1?crid=33Z7BBJJ0FY0G&dib=eyJ2IjoiMSJ9.wIEPeZpCD-RhVeATyivWSBF2icuECH7HARajzxG2AqpBsgKTBvpVmV58PE0iv-RA6rOuBA2YXyn2uU4fFozshVDSWffIZRuyQ044DJnSJYb93y2rLXh_SXGTj0c-HKYN3ZS3falv-dxjKOwybbUkEurhqpmXb0XB950bbPGRjZhFJrWUDj2VrT-h3KFuv8WunxSQxFR3llsOUUvE8JNhHBBuxbLo47mwlyH4fPaazAg.O-4QumaXUNaqCtT0ICKj9u7D3NzamYYorZi_S_tYhnM&dib_tag=se&keywords=a30m&qid=1780948924&sprefix=a30m%2Caps%2C182&sr=8-1 Power Probe:https://www.amazon.com/VDIAGTOOL-Automotive-Circuit-Breaker-Electrical/dp/B0CKQV587H/ref=sr_1_1?crid=1P0VO6OCI08I6&dib=eyJ2IjoiMSJ9.mq64aWtCwKkv9Sca8kuMoEp5vgZsHbVbdmFJn5UbLOuFKyvh35i1mlHCHzdyiSfC6xKCVU-JhwE3Z1xl3_Eq_llIUw-MJv-kfE9U66ykwB9pZeCpUmIp9ApKEUoCpJycQZoVvQx9rxW-RIolahd2WQ90bwu4vY-4Rp3iTol4c8AIrEwcyKUm8UG6wb2YJWG1m8J_WDVQkgSH19Z4i07Ta9BjrkiS7Eyt-7gSd1rzZQv8O6X9Dt74uuDarWw67qEAP68rrtZSwiruLvlLDifIZ1pF3PhjtOnBFDLUgWAb_zw.TXjjbzq76NI58mQww75RrD7h__vgS1oLj7g6qj98K1c&dib_tag=se&keywords=power+probe&qid=1780948980&sprefix=power+%2Caps%2C320&sr=8-1