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2021 Chrysler 300
Key Replacement - Save vs Dealer in San Diego

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

Available
2021 Chrysler 300 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
100+reviews
See why they skip the dealer113KSubscribers
Certified 2021 Chrysler 300 key replacement info from EZ Car Keyz Encinitas CA
Marco Levy • EZ Car Keyz 🔥
Licensed Mobile Locksmith • San Diego, CA
15+
Yrs Exp
Certified 2021 Chrysler 300 key replacement info from EZ Car Keyz Encinitas 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
619 Special
10% OFFCODE:EZ-619-2026

🔥 Save big on your car key today 🔥

Valid on all key types & programming
REDEEM (619) 876-1271

2021 Chrysler 300
Key Options

Dealer-grade key for a fair, honest price

Push To Start
Most popular Chrysler key typeMost Popular
2021 Chrysler 300 Smart Key M3M-40821302
FCC IDM3M-40821302Part #68155687Buttons5BatteryCR2032Frequency433 MHzRemote StartYes
✓ In Stock · Programmed On-Site
Push To Start
2021 Chrysler 300 Smart Key M3N-40821302
FCC IDM3N-40821302Part #68155686ABButtons4BatteryCR2032Frequency433 MHzRemote StartNo
✓ In Stock · Programmed On-Site
Emergency Key
2021 Chrysler 300 Emergency Key
FCC IDPart #ButtonsBatteryFrequencyRemote StartNo
✓ In Stock · Programmed On-Site
Metal Key
2021 Chrysler 300 Metal Key
FCC IDPart #ButtonsBatteryFrequencyRemote StartNo
✓ In Stock · Programmed On-Site
Key
2021 Chrysler 300 Key
FCC IDPart #ButtonsBatteryFrequencyRemote StartNo
✓ In Stock · Programmed On-Site
OEM quality 2021 Chrysler 300 key fob from EZ Car Keyz Encinitas CA
Skip the Dealer Markup
Professional key, honest rate
OEM quality 2021 Chrysler 300 key fob from EZ Car Keyz Encinitas CA
🔧 PRO TIP
The 2021 Chrysler 300 uses a 5-button smart key fob running a CR2032. One thing that trips people up: when the fob battery gets low on these, the car doesn't always throw a clean warning right away. What you get first is inconsistent range, then the push-button start stops responding unless you hold the fob right up against the button. That's the fob telling you the battery is nearly gone, not a module problem. Swap the CR2032 before assuming anything else. Also worth knowing: if you bought a replacement fob online, it still needs professional diagnostic equipment to pair to the vehicle. There's no DIY button sequence on this system. The immobilizer programming has to go through the OBD port with the right software.
Related services: Ignition Repair · Smart Key

Save 40-60% on Your Chrysler 300 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 (619) 876-1271

2021 Chrysler 300 Smart Key Replacement - Fast, Affordable & Professional

Cardiff-by-the-Sea is one of those neighborhoods where I'll get a call, pull up to a house a block from the water, and the job turns out to be anything but simple.

A woman called about her 2021 Chrysler 300. The fob had gotten wet, dried out, and now the push-button start was hit or miss. Sometimes it worked fine. Sometimes she'd sit there pressing the button while the dash gave her a key-not-detected warning and nothing else.

She'd already bought a new fob online. It was sitting in the box, still sealed, because she'd heard somewhere that you couldn't just swap these in yourself.

She was right about that part.

I connected to the OBD port, pulled up the vehicle security system, and got the existing key count. Her original wet fob was still enrolled. We kept it as a backup after I confirmed the electronics had survived the soaking. Then I paired the new fob she'd ordered, cut a replacement blade to match the vehicle, and enrolled both keys into the system.

The testing is where I earn the job. Not just a test start. I walked the perimeter of that 300, checked every button on both fobs from distance, confirmed the door lock and unlock on all sides, and did three clean ignition cycles back to back. If something intermittent is going to show up, it usually shows up in that third cycle.

Both fobs worked clean. She asked what the dealer would have told her to do with that still-sealed fob she'd ordered online.

Probably nothing helpful, I said. And it would have taken a week to find out.

Save vs the Dealer on Your Chrysler 300 Key

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

Get Pricing (619) 876-1271 Text Us
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
Fully Insured Locksmith - Hiscox Liability and Vehicle Damage Coverage
Fully Insured
Liability & vehicle damage coverage
Google Guaranteed Locksmith - Verified and Background Checked
Google Guaranteed
Verified & backed by Google
Also serving: Cardiff-by-the-Sea · Downtown Encinitas · Leucadia · Moonlight Beach

Chrysler 300 Rapid Response, Done Right

Rapid response in the field

Licensed locksmith replacing 2021 Chrysler 300 key in Encinitas CA
Smart Key | Rapid On-Site Service
2021 Chrysler 300 | San Diego
Licensed locksmith replacing 2021 Chrysler 300 key in Encinitas CA
2021 Chrysler 300 Smart Key
2021 Chrysler 300
Smart Key | Programmed for Less
Estimated arrival time to Encinitas
Quick & Affordable
Rapid Arrival
Available Today
Service location Encinitas
Encinitas
Best Rate Here
619 Area
Same-Day Keys (619) 876-1271

Chrysler Customers Love Our Prices

Real savings, real reviews

M
Miston
Dec 2025
★★★★★

“My ignition would not turn in La Jolla and I thought I needed a tow. EZ Car Keyz repaired the ignition on the spot and also made a spare key for safety. The technician worked carefully and confidently.”

Google Review
R
Rick R.
Apr 2021
★★★★★

“Niv showed up, did his thing, and just like that I had two new keys for a fraction of what the dealership quoted. I have zero reservations recommending him to anyone who needs car keys replaced.”

Google Review
f
frankborja25
Dec 2019
★★★★★

“We had one broken key for our Honda Civic and one working key for our Lexus. Tim came out and cut three remote car keys at a great price. All keys worked perfectly. Professional, courteous, and highly recommended.”

Google Review
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5-star review of 2021 Chrysler 300 key service by EZ Car Keyz Encinitas CA
“Real savings, real reviews.”
5-star review of 2021 Chrysler 300 key service by EZ Car Keyz Encinitas CA
5.0 out of 5 - Based on Over 100 five-star Google reviews
Best Price (619) 876-1271

Chrysler 300 Mobile Service FAQ

Real costs, no dealer surprises

My key fob shell cracked. Do I need a full replacement?
Not always. If the electronics inside survived, I can transfer the internal board and the key blade into a new shell without running through the full programming sequence again. The immobilizer cares about the chip, not the plastic housing around it. That said, these fobs do take abuse, and if the board looks corroded or cracked from the fall, a shell swap won't fix it. I'll check the internals on site before recommending which way to go. If the board is good, a shell transfer is quick and saves you money. If it's not, I cut and program a complete replacement. Either way, you leave with a working key.
What exactly is a smart key and how does the 2021 Chrysler 300 use one?
My Chrysler 300 is showing a key-not-detected warning. What should I do first?
I have one working key left for my 2021 Chrysler 300. Should I get a spare made now or wait until I need it?
Can I use a fob I bought on eBay or Amazon for my 2021 Chrysler 300?
Questions? Call (619) 876-1271

Chrysler 300 Key Service Areas

Affordable mobile service across the region

📍San Diego County
San Diego County service area map
619 LOCAL LOCKSMITH
need a key? 🔑
San DiegoChula VistaOceansideEscondidoCarlsbadEl CajonVistaSan MarcosEncinitasNational CityLa MesaSanteePowayCoronado
Licensed 2021 Chrysler 300 locksmith service area in Encinitas County CA
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