📍 Serving Worthing & West Sussex — 24/7 Mobile Auto Locksmith
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Seat Key Replacement Worthing With Keys Cut and Coded at Your Car

Seat key replacement is a new Seat key cut to your locks and coded to the car, so it opens and starts again. Worthing Auto Locksmith does it at the car on the Ibiza, Leon, Arona, Ateca and the rest of the range, for flip keys and KESSY keyless keys, and agrees the price on the call.

✔ Ibiza, Leon, Arona, Ateca✔ HU66 Blades Cut On Site✔ No Wait for the Dealer✔ Open 24 Hours
🕐
Available 24/7
Day, night & bank holidays
🚐
Done at Your Vehicle
No tow to a dealer
🔑
All Makes & Models
Cars, vans & LCVs
💷
Price Agreed First
Before a van is sent
WHAT THE SERVICE IS

Seat Key Replacement in Worthing

Every Seat since the late 1990s has a chip key, so a replacement Seat key is two jobs. The HU66 blade is cut to the locks, and Seat key programming codes the chip to the immobiliser so the engine will run. Seat is part of the Volkswagen Group, often shortened to VAG, so its keys and key systems match VW, Audi and Skoda of the same years. It is the Seat side of car key replacement, and the other makes are listed under the car makes we cover.

Spare Seat Keys When One Key Still Works

With a working key, a new key is added alongside it. It is the quickest and cheapest route on any Seat, and on the newest models it can be the only route outside the dealer. The wider service is a spare car key.

AT A GLANCE
Seat Key Replacement Worthing
  • ✔Ibiza, Leon, Arona, Ateca
  • ✔HU66 Blades Cut On Site
  • ✔No Wait for the Dealer
  • ✔Open 24 Hours
📞 Call 07932805727
The price is agreed in writing on the call, before a van is sent.
BY GENERATION

Which Key System Your Seat Has, From IMMO 4 to the VAG MQB Platform

The model and year point to the key system, and the key system decides what can be done at the car. The registration confirms it before anyone sets off.

Key systemTypical Seat modelsChipWhat it means
IMMO 4Leon 2, Ibiza 4, Altea, Toledo 3, ExeoID48Spare and all keys lost at the car
MQB platformLeon 3, Ibiza 5, Arona, Ateca, TarracoMegamos AESSpare and all keys lost at the car
Later MQB, from about 2020Later Ibiza, Arona and AtecaMegamos AESSpare at the car with a working key, all keys lost confirmed on the call
Newest Seat and Cupra systemLeon 4 from 2020, Cupra Formentor and BornNewest chipConfirmed on the call, sometimes the dealer

If your Seat needs the dealer, you are told on the call, so you never pay for a visit that cannot finish.

THE BLADE AND KEY TYPES

The HU66 Blade and Seat Key Types

Most Seat keys use the HU66 blade, a high security profile with a track milled along each side rather than notches on the edge.

The Seat Flip Key

The folding key with lock, unlock and boot buttons, used on most Ibiza, Leon and Arona models for the last twenty years. It carries the blade, the chip and the remote in one head, and this Seat remote key runs on a CR2032 battery.

KESSY Keyless Keys

Seat names its keyless entry and start system KESSY. The key is coded to the keyless system as well as the immobiliser, the work covered under smart key replacement.

Cut by Code or From the Lock

With no key to copy, Seat key cutting starts from the key code or the door lock, and the blade is cut in the van, the work described under car key cutting.

BY MODEL

Seat Key Replacement by Model

The Seat models asked about most, and the key each one uses.

Seat Ibiza Key Replacement

The Ibiza 4 uses IMMO 4 and the Ibiza 5 from 2017 the MQB platform, both cut and coded at the car. Later Ibiza cars are covered with a working key.

Seat Leon Key Replacement

The Leon 2 uses IMMO 4 and the Leon 3 the MQB platform, both covered at the car. The Leon 4 from 2020 uses the newest system and is confirmed on the call.

Seat Arona Key Replacement

The Arona arrived in 2017 on the MQB platform, sharing its flip key with the Ibiza of the same years, cut and coded at the car.

Seat Ateca Key Replacement

The Ateca uses the MQB platform, with a flip key or a KESSY keyless key on higher trims. Both are covered at the car.

WHAT IT COSTS

Seat Key Replacement Cost by Model

Seat keys cost less than most premium makes. These are typical 2026 UK prices with a mobile locksmith, next to the usual dealer price.

ModelSpare keyAll keys lostSeat dealer
Mii£90 to £150£150 to £220£200 to £300 or more
Ibiza£100 to £170£160 to £250£220 to £320 or more
Arona£110 to £190£170 to £280£250 to £350 or more
Leon£110 to £200£170 to £300£250 to £380 or more
Ateca£130 to £220£200 to £320£280 to £400 or more
Alhambra£120 to £200£180 to £300£250 to £380 or more
Tarraco£150 to £250Confirmed on the call£300 to £450 or more

A high street key cutter can copy a basic blade, but a Seat key needs the chip coded to the car, which a mobile locksmith does the same day.

COST FACTORS

What Drives the Cost of a Seat Key

Four things move the price of a Seat key.

The Key System

IMMO 4 and early MQB keys cost less to code than keys for the newest Seats.

Flip Key or KESSY

A KESSY keyless key costs more than a flip key for the same car.

Whether a Key Still Works

A spare costs less than all keys lost, where the blade is decoded and the car data read first.

The Time of the Call

A night or weekend visit can cost more, and that is said on the call.

ALL KEYS LOST

Lost Seat Keys and All Keys Lost

On IMMO 4 and MQB Seats, a new key is made from the car data, often read from the instrument cluster through the OBD port, and coded at the car, usually in one to two hours. The lost keys are removed so they can no longer start the car, the step described under a car immobiliser reset. The full lost key process is under lost car keys.

Newer Seats and Online Protection

From about 2020 the Volkswagen Group added online protection to its diagnostics, so on the newest Seats some key work has to be authorised through the maker. That is why a working key matters, and the route is confirmed on the call.

Second Hand Seat Keys

Second hand keys bought online are usually locked to the car they came from. The key is supplied for the job and coded to yours.

CHECK FIRST

Seat Key Not Working, Check These First

Not every Seat key fault needs a new key. These are the usual causes and what fixes each one.

What you noticeLikely causeWhat fixes it
Buttons need pressing hard or do nothingWorn switches or a weak CR2032A battery, then a repair
Flip blade loose or will not foldBroken flip caseA new flip case
Remote range shorter than it wasWeak batteryA new battery
Immobiliser light on, car will not startKey not recognisedCar key programming
Key hard to turn in an older SeatWorn ignition barrelIgnition barrel repairs
Keys locked inside the carNo fault with the keyLocked keys in car
SHARED KEYS

Seat, Cupra and the Volkswagen Group

The four Volkswagen Group brands share the HU66 blade, IMMO 4 and the MQB platform, so a Leon, a Golf, an A3 and an Octavia of the same years are handled the same way. The Skoda side is set out under Skoda key replacement, and the Audi side under Audi key replacement.

Cupra

Cupra began as the sporty Seat badge and is now its own brand. A Cupra Leon or Cupra Ateca uses the same key as the Seat it is built on.

The Seat Mii

The Mii was built alongside the VW up and Skoda Citigo and shares their key, cut and coded at the car.

HOW IT WORKS

How a Seat Key Replacement Works in Worthing

Every Seat key job starts with the key system and the year of the car.

1

Registration and Key Checked

Call 07932805727 with the registration, and say whether the car has KESSY.

2

Price Agreed in Writing

The price is agreed before a van leaves, including the key and the coding.

3

Ownership Checked and Key Coded

The V5C, VIN and photo ID are checked, then the key is cut and coded at the car.

4

Tested, and Lost Keys Removed

Every key is tested on the doors, boot and engine, and any lost key is removed.

VEHICLES WE COVER

Seat Models We Make Keys For

Most Seat models are covered at the car. The newest models are confirmed on the call.

Seat hatchbacks
✔ Mii
✔ Ibiza
✔ Leon
✔ Toledo
Seat SUVs and MPVs
✔ Arona
✔ Ateca
✔ Tarraco
✔ Alhambra
✔ Altea
Cupra and older Seats
✔ Cupra Leon
✔ Cupra Formentor
✔ Cupra Ateca
✔ Exeo
COVERAGE

Areas We Cover for Seat Key Replacement Worthing

Seat keys are replaced at the car across 15 towns and districts in BN11 to BN17, BN43, BN44, BN5 and RH20. Arrival times for each town are listed under areas we cover.

Worthing districts
📍 West Worthing BN11📍 Broadwater BN14📍 Durrington BN13📍 Goring-by-Sea BN12
East, along the Adur
📍 Lancing BN15📍 Shoreham-by-Sea BN43
West, along the Arun coast
📍 Ferring BN12📍 East Preston BN16📍 Angmering BN16📍 Rustington BN16📍 Littlehampton BN17
North, over the Downs and into the Weald
📍 Findon BN14📍 Steyning BN44📍 Storrington RH20📍 Henfield BN5
FAQS

Questions About Seat Key Replacement in Worthing

The questions asked most about Seat keys, from KESSY and cost to lost keys.

A spare Seat key usually costs £90 to £250 with a mobile locksmith, depending on the model and key, and all keys lost a little more. A Seat dealer usually charges £200 to £450 or more. The price for your car is agreed on the call.

It is the Seat keyless system. KESSY lets the car open and start with the key in your pocket, and the key holds an emergency blade for a flat battery.

Often a repair, not a new key. A new CR2032 battery comes first, then a remote car key repair for worn buttons.

Usually not. The key moves into a new flip case, which is a car key fob repair and costs less than a Seat key fob replacement.

Usually under an hour for a spare, and one to two hours for all keys lost. A dealer often orders the key first, which can take several working days.

Often, yes, apart from the badge. Seat is part of the Volkswagen Group, so it shares the HU66 blade and the same key systems, as set out under Volkswagen key replacement.

Yes, on IMMO 4 and MQB Seats. The HU66 blade is cut to code and the key coded at the car. Seats from about 2020 are confirmed on the call.

Yes, on every Seat since the late 1990s. The chip is coded as described under transponder key programming.

Usually not. The chip is coded once and then locked to its car, so a used key from another Seat will not code to yours.

Yes. Seat keys are replaced at the car across Worthing, Goring, Lancing, Shoreham-by-Sea and the rest of the 15 towns covered.

Seat Keys Cut and Coded Across Worthing, at Your Car

Have the registration ready, and say whether the car has KESSY. The price is agreed in writing before a van leaves.

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