2004 Mazda 3
Key Replacement - Save vs Dealer in Ventura County
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2004 Mazda 3
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2004 Mazda 3 Transponder Key Replacement - Fast, Affordable & Professional
Got a call from a guy over in the Oak Park area of Simi Valley. His 2004 Mazda 3, the first-gen BK chassis, had one key left and it was barely hanging on. The blade was worn thin from years of pocket carry, and the plastic head had a hairline crack running right through the middle where the 4D-63 chip sits.
He told me his wife's key snapped in the ignition six months ago and they'd been down to the one ever since. He kept meaning to get a spare. Then the crack happened and suddenly it felt urgent.
I cut a new MAZ24 blade to code, not copying the worn original, and programmed the fresh 4D-63 chip through the OBD port. The 2004 Mazda 3 immobilizer lives inside the instrument cluster, and the security protocol is the older 40-bit system, so the process is clean and predictable with the right equipment. Programmed a second spare while I was there so they'd never be in the one-key situation again.
Tested both new keys. Engine fired on each one within a second, no extended crank, no flashing immobilizer light. He held up the cracked original next to the new ones and just shook his head at how bad it had gotten.
Two working keys, done in his driveway, on a Tuesday afternoon. The dealer quoted him a week-long wait and way more money for a single key.
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“I lost my Honda Passport key and called EZ Car Keyz. He came out and made a new key in under five minutes. Legendary service.”
“They responded instantly, showed up within an hour, and arrived exactly when they said they would. Made a copy and programmed a fob for my 2014 car with a worn ignition in about 15 minutes. The new key works perfectly and feels like a dealer key.”
“About 15 minutes after calling, he was already at my home. I had lost my original Ford key and he made and programmed a new one on the spot. Very fast, very professional.”
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