Question 1

How do I spot a fake locksmith before I get ripped off?

Accepted Answer

A few things to watch for. If they won't give you a real estimate for your specific vehicle over the phone, that's a problem. A bait-and-switch setup usually starts with a low "service call" price and then the real number appears once they're already at your car. Also watch for anyone who can't tell you what tools they use on Honda and Acura immobilizers specifically. These systems require dedicated equipment, not a generic OBD dongle. If they hesitate on that question or can't explain the process, they either don't have the right gear or haven't done many of these. A real specialist will answer that question without thinking about it.

Question 2

What exactly is a remote key and why can't I just copy it at the hardware store?

Accepted Answer

The key your 2004 RSX uses is a remote with a transponder chip inside. It does two things at once: the chip communicates with the immobilizer so the engine will run, and the buttons handle lock and unlock. Hardware stores can cut the blade shape, but they cannot program the transponder. Without that programming step, the car will crank and immediately die. The immobilizer sees an unrecognized chip and shuts it down. Cutting alone gets you a key that turns the ignition but doesn't start the car, which confuses a lot of people who try the hardware store route first.

Question 3

What equipment do you use to program RSX keys?

Accepted Answer

Professional-grade tools built specifically for Honda and Acura immobilizer systems. These aren't generic scanners. The Honda and Acura lineup from this era has a specific security architecture that requires dedicated software and the right key-cutting equipment for the blade profile used on the RSX. Generic locksmiths who don't specialize in this sometimes get stuck because they invested in broad coverage tools instead of depth on this platform. I've gotten calls from RSX owners who tried another locksmith first and were told the programmer "didn't connect right." That's a tooling problem, not a car problem.

Question 4

My RSX starts fine but the lock and unlock buttons on the fob stopped working. Do I need to reprogram it?

Accepted Answer

Not necessarily. If the car starts, the transponder side of the fob is still recognized by the immobilizer. The remote functions run on a separate signal, and that side is more sensitive to battery voltage than the transponder chip is. A CR2025 that's low but not dead can drop the remote range to almost nothing while leaving the start function completely intact. Swap in a fresh CR2025, make sure it's seated flush, and test from a few feet away. If the buttons come back, you're done. If range is still short or the buttons are still dead after a new battery and clean contacts, that points to the remote side needing a resync, which is a quick bench job.

Question 5

I bought a replacement fob online for my 2004 RSX. Can I program it myself?

Accepted Answer

The remote functions on these can sometimes be synced through an onboard procedure if you still have a working key, but the transponder chip inside the fob requires professional programming equipment to register to your immobilizer. So if you bought a fob expecting a full DIY, you're halfway there at best. The blade still needs to be cut to your vehicle, and the chip still needs to be written and enrolled. If you already have a working key and just want to add the remote functions of a second fob, that's the simpler version of the job. All-keys-lost with only an unprogrammed fob in hand is a longer process. Either way, call before assuming the fob you bought is ready to go.

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