Question 1

Do you use OEM or aftermarket keys on a 2002 Cadillac Seville?

Accepted Answer

We match the correct key blank and transponder chip type to your vehicle before we head out. On a 2002 Seville, the transponder is the whole job - the chip has to be the right type for the immobilizer to accept it. Cheap blanks sourced from unknown suppliers sometimes carry the wrong chip internally even when the key head looks identical. We verify compatibility before cutting. The blade profile gets cut to your vehicle, the chip gets programmed on site, and we don't hand it over until we've confirmed it starts the car cleanly.

Question 2

How long should a replacement transponder key last on a car this age?

Accepted Answer

A properly programmed key on a 2002 Seville should hold up for years. The transponder itself has no moving parts and doesn't wear out under normal use. What does wear is the physical key - the blade can get bent from heavy keychains, the plastic head cracks, and the blade tip takes abuse if someone's rough with the ignition cylinder. If the shell goes but the chip is still alive, the electronics can sometimes be transferred to a new key head rather than starting over completely. The ignition cylinder on cars this age can also develop wear that makes any key - new or old - feel sloppy. Worth knowing before you blame the replacement key.

Question 3

What if my new key stops working a few weeks after you program it?

Accepted Answer

Call me. I back up the work. If the key was programmed correctly and something changes - intermittent starts, the immobilizer acting up, anything - I come back out and sort it. The more common scenario on older vehicles like this Seville is that a second underlying issue surfaces after the key is fixed. Sometimes a worn ignition cylinder starts misbehaving once the key situation is resolved and owners are paying attention again. I'll tell you what I see and what the actual cause is, rather than just re-programming and sending you on your way.

Question 4

My 2002 Seville starts fine sometimes and stalls immediately other times. Could that be the key?

Accepted Answer

Yes, and it's one of the more frustrating symptoms to trace because it mimics fuel or electrical problems. What's happening when the immobilizer rejects the key is the engine starts on the ignition pulse, then the vehicle security system cuts fuel or spark within a second or two and the engine dies. You'll often see a security-related warning light on the dash when this happens.

The intermittent part is what throws people off. A transponder that's failing doesn't always fail completely right away. It may read correctly eight times and then miss on the ninth, which is why some owners go weeks chasing a misfire or fuel delivery diagnosis before someone checks the key.

If you're seeing that pattern on a 2002 Seville, the key and the immobilizer are the first things I want to look at, not the last.

Question 5

I only have one key left for my 2002 Seville. Should I get a spare made now or wait until something goes wrong?

Accepted Answer

Get the spare made now. All-keys-lost on a vehicle with a transponder system is more involved than adding a spare while you still have a working key. With a working key present, the process is faster and simpler. Once that last key is gone or stops reading, the job takes longer and typically costs more. A 2002 Seville is old enough that replacement parts are getting harder to source on short notice, and a spare sitting in a drawer costs you nothing until the day it saves you an afternoon.

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