1998 Mercedes-Benz Cl-Class
Key Replacement - Save vs Dealer in Ventura County

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Professional 1998 Mercedes-Benz Cl-Class locksmith quote from EZ Car Keyz Camarillo CA

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1998 Mercedes-Benz Cl-Class
Key Options

Dealer-grade key for a fair, honest price

Professional 1998 Mercedes-Benz Cl-Class key programming by EZ Car Keyz Camarillo CA

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The 1998 CL-Class (W140 chassis) runs an infrared-based key system through the EZS (Elektronisches Zündschloss) module, part number 140 545 09 08 on most builds. The EZS talks to the engine ECU over the K-line, not CAN. When the IR emitter in the key head dies, the EZS can't authenticate and you get a no-crank, no-start with no warning lights. The IR LED is inside the key bow near the buttons. Swap the CR2025 first, but if range is fine and the car still won't crank, the IR emitter or the EZS receiver window is the problem, not the engine computer.

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Related services: Ignition Repair · Smart Key

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Location

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Wait Time

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✕ 2-5 days

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All Keys Lost

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1998 Mercedes-Benz Cl-Class Replacement - Fast, Affordable & Professional

Got a call from a guy near Camarillo Village Square in Camarillo. His 1998 Mercedes CL500 wouldn't start. Turned the key, nothing. No crank, no click, dash lit up fine. He'd already had it towed home from the dealer after they quoted him a wait of over a week just to look at the EZS module.

When I pulled up he was sitting in a lawn chair next to the car, reading the owner's manual like it was going to reveal something new.

I started with the key itself. The 5WK47283 fob looked rough. The chrome shell had a hairline crack near the hinge, which is standard W140 key aging. Popped it open and the CR2025 tested weak but not dead. The IR LED on the board, though, had a cold solder joint. You could see the tiny ring crack around the base if you tilted it right.

Reflowed the joint, dropped in a fresh CR2025, reassembled. Key went in, EZS authenticated on the first turn, engine fired. Tested all four buttons: lock, unlock, trunk, panic. Everything responded clean.

Then I cut him a spare on the spot and programmed it through the EZS so he'd never be stuck with one key again. The whole thing took maybe 40 minutes in his driveway. He folded up the lawn chair and just said "that's it?" like he was waiting for a bigger problem.

Way less hassle and way less money than what the dealer had lined up for him.

Save vs the Dealer on Your Mercedes-Benz Cl-Class Key

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1998 Mercedes-Benz Cl-Class

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Same-Day Keys (805) 790-8162

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Gordon H.

Dec 2020

★★★★★

“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.”

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T Klein

May 2020

★★★★★

“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.”

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Winter K.

Dec 2025

★★★★★

“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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Certified locksmith review for 1998 Mercedes-Benz Cl-Class service by EZ Car Keyz Camarillo CA

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Mercedes-Benz Cl-Class Mobile Service FAQ

Real costs, no dealer surprises

My key broke in the ignition of my 1998 Mercedes CL-Class. Can you get it out?▼

Yes. The W140 ignition cylinder is mechanical with the EZS module sitting right behind it, so a broken blade needs to come out carefully to avoid pushing fragments into the module housing. I use extractor picks designed for the Mercedes HU64 keyway. Once the broken piece is out, I can cut a new blade to factory spec and reuse your existing key electronics if the IR board and NEC chip on the 5WK47283 PCB are still good. If the shell cracked at the pivot, which is common on these chrome housings, I transplant the board into a new shell and you're back to one working key without reprogramming.