> Are key fobs are the canary in the coal mine of RF interference?
If key fobs use receivers similar to the popular and dirt cheap "433 MHz RF Modules (ideal for Arduino)..." sold on eBay for <1$/piece: these are very, very crude and not selective to a particular frequency at all.
So, yes, they will stop working long before anything else (built a little more sophisticated) starts to show problems. Typically they are designed to be used in close proximity to your car, even if some people got used to operate it at considerable distance.
If key fobs use receivers similar to the popular and dirt cheap "433 MHz RF Modules (ideal for Arduino)..." sold on eBay for <1$/piece: these are very, very crude and not selective to a particular frequency at all.
So, yes, they will stop working long before anything else (built a little more sophisticated) starts to show problems. Typically they are designed to be used in close proximity to your car, even if some people got used to operate it at considerable distance.