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I've been thinking on fitting an after-market reverse parking sensors for my car, and I found 2 options:
The Electromagnetic doesn't require to make holes in the bumper, works at shorter distances and it seems cheaper, so it seems the best option.
My question is, is there any drawbacks with the electromagnetic sensors? Are they easy to fit or do I need to go to a garage?
I would get a reversing camera instead. You can get the type that is mounted on the license plate and then you can either get a radio/headunit which supports backup cams or get a rearview mirror which has a backup display. Personally I would try to get a rearview mirror one. I think you can get the mirror for about ~$500 with the camera but I don't remember the exact price.
As for the two options supplied I would probably go ultrasonic.
My worry about the electromagnetic one is that while it is good at picking up metal objects that you may hit, they aren't so good at organic objects.
Ultrasonic reversing sensors are good at detecting solid objects, but not so good at soft objects.
As solid objects are important to identify, whether or not they are metal, the ultrasonic sensors are, in my opinion, the best ones to install. They are also very cheap, so unless you have cost as an essential priority, ignore pricing as a factor here.
Most home fit kits make the placing of the sensors very simple - the small holes through the bumper are easy to do and will not impact the safety of the bumper in any measurable way.
