Turn on front sensors
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You might also be missing the module entirely if the bumper was replaced.
https://we.tl/t-JIP7WQTllM
As for the parking sensor situation, you will need to connect a scanner and look for codes. If like the other forum member mentioned, the bumper was replaced, they might had indeed replaced it with one that has sensors but the car didn't originally came with sensors, you have rear sensors by chance? At least if you do have rear sensors, it might be real sensors in the front but still has a possibility of both front and rear bumpers replaced.






