Oxidation/rust of engine parts in 2017 Yaris

[tmontague]

Originally Posted by jowii

One mechanic told me in those cases, that the check engine light will come on if it's something serious.

not necessarily, and in my experience as well as others on this forum who had this issue in different cars, a CEL did not illuminate.

You would know if this was damaged from a previous user. You would have the pump constantly shutting off if you try to even come close to filling it at full force. You may also smell gasoline vapors when the tank is full. (this happens on my Vibe, but it still allows me to fill it fully without shutting off the pump)