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2005 Cadillac STS
Key Replacement - Save vs Dealer in Ventura County

Same-Day Keys | Save 40-60% vs Dealer

Available
2005 Cadillac STS Smart Key
Smart Key

Save 40-60% compared to dealership prices. Our certified technicians come to your home, office, or roadside with all the equipment needed to cut and program your key on the spot.

CA BSIS LICENSE LCO#6792
Save 40-60% vs Dealer OEM Quality Parts No Hidden Fees
Fast Response15-25
min arrival
1,000+reviews
See why they skip the dealer113KSubscribers
Certified 2005 Cadillac STS key replacement info from EZ Car Keyz Simi Valley CA
Marco Levy • EZ Car Keyz 🔥
Licensed Mobile Locksmith • Oxnard, CA
15+
Yrs Exp
Certified 2005 Cadillac STS key replacement info from EZ Car Keyz Simi Valley CA
Key specialists
Save 40-60%
Same OEM-quality key, fraction of the dealer price
Fixed pricing
Fixed Pricing
The quote on the phone is what you pay. Period.
Fast mobile service
Free Mobile Service
No trip fees, no towing costs - service included
805 Special
10% OFFCODE:EZ-805-2026

🔥 Save big on your car key today 🔥

Valid on all key types & programming
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2005 Cadillac STS
Key Options

Dealer-grade key for a fair, honest price

Push To Start
Most popular Cadillac key typeMost Popular
2005 Cadillac STS Smart Key M3N-65981403
FCC IDM3N-65981403Part #15212382Buttons5BatteryCR2032Frequency315 MHzRemote StartYes
✓ In Stock · Programmed On-Site
Transponder Key
2005 Cadillac STS Transponder Key
FCC IDPart #ButtonsBatteryFrequencyRemote StartNo
✓ In Stock · Programmed On-Site
OEM quality 2005 Cadillac STS key fob from EZ Car Keyz Simi Valley CA
Skip the Dealer Markup
Professional key, honest rate
OEM quality 2005 Cadillac STS key fob from EZ Car Keyz Simi Valley CA
🔧 PRO TIP
The 2005 STS runs GM's PFS (Passive Fuel Start) system, which is Cadillac's version of the Passkey III+ immobilizer. The smart key fob (FCC ID M3N-65981403, part 15212382) communicates at 315 MHz with the BCM on a rolling-code protocol. A dying CR2032 won't throw a dash warning right away. Instead, you'll notice reduced range on the remote start or the push-button ignition hesitating before cranking. If the dash reads "No Remote Detected," swap the CR2032 first and check that the battery contacts inside the fob housing aren't corroded or bent flat.
Related services: Ignition Repair · Smart Key

Save 40-60% on Your Cadillac STS Key

See how much you save with EZ Car Keyz vs the dealership

EZ Car Keyz
EZ Car Keyz
Dealership
Average Cost
✓ $$
✕ $$$$
Location
✓ We come to you
✕ You drive there
Wait Time
✓ 20-45 min
✕ 2-5 days
Same-Day
✓ Yes
✕ Rarely
All Keys Lost
✓ No problem
✕ Tow required
OEM Quality
✓ Yes
✓ Yes
EZ Car Keyz wins 5 out of 6
Same key, fraction of the dealer price
Book Service (805) 790-8162

2005 Cadillac STS Smart Key Replacement - Fast, Affordable & Professional

Out near Lost Canyons Golf Club in Simi Valley, a guy visiting his daughter for Thanksgiving had a question I actually like getting. Not "my key is dead," but "is my spare good enough to carry every day?"

He had a 2005 Cadillac STS. His original M3N-65981403 fob was scratched up and the unlock button was mushy from years of pocket carry. He'd bought a second key from me a while back as a backup, aftermarket housing, and it had been sitting in a kitchen drawer. Now he wanted to swap to it full time.

Fair question. The aftermarket blank I carry uses the same blade profile, same 315 MHz board layout, same PFS chip spec that talks to his BCM. The button feel and finish are identical. The only visible difference is no Cadillac crest on the back.

I tested his spare on site. Walked every door handle, checked passive entry on driver and passenger side, ran remote start from 30 feet, confirmed push-button ignition, cycled trunk release. Everything responded the way it should. He stood there watching me go door to door like I was doing a home inspection.

Where aftermarket goes wrong is cheap sourcing, and I've returned full batches that didn't meet spec. His spare was from good stock. He drove off carrying it as his daily key, and the old fob went into the drawer instead. The whole thing cost him a fraction of what the dealer would have charged for an OEM replacement.

Save vs the Dealer on Your Cadillac STS Key

Get your key for hundreds less than the dealer. Same quality, same result, better price.

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BSIS Licensed Locksmith - California License LCO#6792
BSIS Licensed
CA Bureau of Security & Investigative Services
NASTF Certified Automotive Locksmith - Vehicle Security Professional
NASTF Certified
National Automotive Service Task Force
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Fully Insured
Liability & vehicle damage coverage
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Also serving: Big Sky · Bridle Path · Corriganville · East Simi Valley

Cadillac STS Rapid Response, Done Right

Rapid response in the field

Licensed locksmith replacing 2005 Cadillac STS key in Simi Valley CA
Smart Key | Rapid On-Site Service
2005 Cadillac STS | Ventura County
Licensed locksmith replacing 2005 Cadillac STS key in Simi Valley CA
2005 Cadillac STS Smart Key
2005 Cadillac STS
Smart Key | Programmed for Less
Estimated arrival time to Simi Valley
Quick & Affordable
Rapid Arrival
Available Today
Service location Simi Valley
Simi Valley
Best Rate Here
805 Area
Same-Day Keys (805) 790-8162

Cadillac Customers Love Our Prices

Real savings, real reviews

K
Kane G.
Apr 2024
★★★★★

“Tim is a hero. He programmed a master proximity key for a newer Volkswagen that multiple locksmiths refused to touch. He spent hours until late at night making sure every function worked perfectly. The skill level here is incredible.”

Yelp Review
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Natasha S.
Sep 2025
★★★★★

“Very professional and extremely affordable. The price was literally about three times cheaper than what my dealership quoted me. Fast service and no stress at all. Highly recommend.”

Google Review
A
A. G.
Jun 2025
★★★★★

“A friend lost my Lexus key and he was able to program and cut a brand new one within 20 minutes. Arrived within about 40 minutes and was friendly, efficient, and quick.”

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5-star review of 2005 Cadillac STS key service by EZ Car Keyz Simi Valley CA
“Real savings, real reviews.”
5-star review of 2005 Cadillac STS key service by EZ Car Keyz Simi Valley CA
5.0 out of 5 - Based on Over 1,000 five-star Google reviews
Best Price (805) 790-8162

Cadillac STS Mobile Service FAQ

Real costs, no dealer surprises

I lost all my keys for my 2005 Cadillac STS. Can you still make a new one on site?
Yep. All-keys-lost on the 2005 STS is a job I handle on site regularly. The process is a BCM security access through the OBD-II port, a PFS immobilizer relearn, cutting a new key blade to code, and programming the M3N-65981403 smart fob fresh. Any old missing fobs get wiped so they can't start the car. The GM theft deterrent relearn has a timed sequence built in, so expect it to take around 30 to 45 minutes total. Cadillac dealers quote significantly more and require a tow. I come to you in Simi Valley.
Do I need to tow my 2005 STS to the dealer if I have no keys?
How long does an all-keys-lost replacement take on a 2005 STS?
My 2005 STS dash shows "Service Theft Deterrent System." Is that the key or the car?
Can I program a new smart key fob for my 2005 STS myself?
Questions? Call (805) 790-8162

Cadillac STS Key Service Areas

Affordable mobile service across the region

📍Ventura County & SB
Ventura County service area map
805 LOCAL LOCKSMITH
need a key? 🔑
Santa Barbara
Santa BarbaraETA 30-35 min
Goleta
GoletaETA 30-35 min
Isla Vista
Isla VistaETA 30-35 min
Montecito
MontecitoETA 25-30 min
Carpinteria
CarpinteriaETA 20-25 min
Ojai
OjaiETA 20-25 min
Ventura
VenturaETA 10-15 min
Santa Paula
Santa PaulaETA 20-25 min
Fillmore
FillmoreETA 25-30 min
Oxnard
OxnardETA 10-15 min
Port Hueneme
Port HuenemeETA 10-15 min
Camarillo
CamarilloETA 15-20 min
Moorpark
MoorparkETA 25-30 min
Simi Valley
Simi ValleyETA 30-35 min
Thousand Oaks
Thousand OaksETA 20-25 min
Santa BarbaraGoletaMontecitoCarpinteriaOjaiVenturaSanta PaulaFillmoreOxnardPort HuenemeCamarilloMoorparkSimi ValleyThousand Oaks
Licensed 2005 Cadillac STS locksmith service area in Ventura County CA
Licensed 2005 Cadillac STS locksmith service area in Ventura County CA
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