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2019 subaru outback limited 20,000 miles green followed me home. I'll post pice later. My God the owners manual is thicker then my college thermodynamics and emissions engineering text book

Yes, this - they can tell which (or how many) sensor it is. Ideally they don’t charge for diagnosis and eventual repair. If so I’d rather hand them sensors and pay once to have it done...but that’s only viable if you know it’s a bad sensor for sure. Which has always been the case on known vehicles I’m working on. Drive fine for years then light comes on...been a sensor every time.

there's also another type of relays that doesn't have the spade terminals poking out of it colored already, instead it has numbers on the top or side of the relay, 86 and 85 are your low current, should click loudly if current is given to those 2 pins (literally negative and positive to it). 30 and 87 are your high current paths, high amperage comes in (+), and high amperage goes out (+).

that's it, that's the fuel tank plug, mine didn't have a rubber seal to it, it just seals. relays are simple as long as you use a 4 pin type. 2 are usually silver, and 2 are gold plated, i don't remember which is which but one of those pairs controls the low current switch, meaning one goes to ground, the other you'll need to find a switch hot but a hot that stays on while cranking. you can test for this with a multimeter and disconnecting the wire that activates the solenoid to your starter so you don't wear that part out, and have someone "crank" with the key while you search for a hot, i don't remember what i grabbed onto but i don't recommend the ignition coil circuit. the other 2 pins are the high amperage load switch, you run a FUSED hot from the battery with fresh wire, connect that to the high load side of the relay, connect another wire to the last remaining port on the relay which would be the corresponding high load pair, route it around the back of the engine against the firewall and connect it to your fuel pump. the hardest thing out of all this is finding a switched hot with the ignition key on and cranking.