2003 BMW Z4
Key Replacement - Save vs Dealer in San Diego
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2003 BMW Z4
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Dealer-grade key for a fair, honest price
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2003 BMW Z4 Remote Head Key Replacement - Fast, Affordable & Professional
When a 2003 BMW Z4 key is done wrong, BMW's immobilizer makes it obvious fast. The engine cranks but cuts fuel instantly. The fob slots but the CAS throws an error. Or the key programs initially but the DME rejects the ISN sync and the car dies after one drive cycle. BMW security is layered, and cutting corners on any layer means the whole job fails.
A customer at the watch repair shop in Rancho Bernardo had a key from another locksmith that worked for three days then stopped. His Z4 would crank but immediately cut fuel. The other locksmith told him the DME was bad.
The DME was fine. The locksmith hadn't completed the ISN synchronization between the CAS4 module and the engine computer. BMW's immobilizer requires the CAS and DME to exchange a secret number. If that sync is skipped or done wrong, the car runs temporarily on a grace period then shuts down. I used my VVDI2 to read the CAS4 data, confirmed the ISN mismatch, and reprogrammed the key with the correct sync. His fob, FCC ID LX8FZV, was a 3-button smart key. Engine start was clean with no fuel cutoff.
His cost was $185. Dealer would have charged $395. The difference between a BMW key that works and one that dies after three days is the ISN sync. I verify it on every job because a callback on a BMW is expensive for everyone.
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“My son had an issue opening the driver door on his Honda Civic. I called on New Year's Day and expected a nightmare, but they arrived quickly and fixed the problem in about half an hour.”
“I needed a second key made for my 2012 Nissan Altima. They arrived quickly, finished in about 15 minutes, and gave me the best price I could find.”
“I lost my key and called EZ Car Keyz. Marco was great. He arrived quickly, explained everything clearly, and kept me informed throughout the entire process. The service was fast, professional, and fairly priced.”
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