Hi. I have 20021 CX-5. On my old Subaru I regularly removed fuel pump fuse when parked overnight on a street as an anti-theft measure and I never had a problem starting the car after putting the fuse back. Very quick and easy. Does anyone knows if this would be problematic on a new CX-5? With all the "smart" features, I don't know what it could trigger. Thank you very much!

 

It might be easier to install a hidden kill switch which disables the battery -
-

 

I'd be worried that the fuse box would wear out. It's not designed to be pulled / inserted daily. I'm not sure if removal would cause any other problems.

 

Is car theft that much of a problem in your neighborhood?

 

LOL hard to get a straight answer... huh?
NO there is nothing to be concerned about. And the contacts on the fuse are softer than the contacts on the MAZDA so it is not likely you would wear them out.

If I was going to consider what you are doing, I would remove the fuse out of the MAZDA fuse panel and run a remote and simple hidden switch. It would take you about an hour to install and the parts about 10- 20 bucks.

 

for all the answers.@Callisto, thank you.

 

The fuel pump fuse in CX-5 is located in the fuse box under the hood, so not very convenient for everyday use.

Assuming we are talking about a seasoned car thief as opposed to a teenage joyrider, most of the criminals are aware of state-of-the-art antitheft measures.
1) Fuel pump killswitch is the first thing they suspect when the car doesn't start. What they usually do is peel off the floor mat and power the fuel pump directly from a nearby working wire.
2) They are also aware of pulling-the-fuse trick for the fuel pump, starter and the ignition coils, they will bring spare fuses with them.
3) To bypass the immobilizer, they will bring a raspberry-powered device and register their own key in the immobilizer system using a CAN wire, typically by plugging into the OBD port under the steering wheel. Physically relocating the OBD slot helps in some cases but an experienced thief will tap into the CAN bus elsewhere in the vehicle, there are plenty of places where they can do that. Alternatively, they can bring their own ECU with pre-registered keys. You can install a CAN bus killswitch (microcontroller) and hide it in a secret place, but it's typically not something that you can DIY.
4) If they are targeting a car with keyless entry system and they know roughly where the key is, they will bring a radio signal transmitter to trick the car into thinking that the key is nearby. Putting the key in a farraday box/pouch prevents the key from receiving the relayed signal.
5) Something that I am not seeing in the US but is common in other parts of the world - a steering shaft blocking mechanism. And I am not talking about the flimsy steering wheel locks that can be broken with bare hands or taken off by sawing through the steering wheel. Instead, it's something that you put on the shaft itself and it locks in place between the engine compartment panel and the braking pedal bracket. Not completely thief-proof since you can saw through it with an angle grinder. Produces a lot of noise though.

And of course there is the tow truck option. Nothing you can do about it except watching the car 24/7 on a surveillance camera.

Conclusion: get a good car insurance, a signal blocking pouch and a visual deterring device to ward off random crackheads. There is nothing else you can do against a well planned operation.