Key Fob Programming in Mississauga

The words get used interchangeably and the difference decides what a replacement costs.

A remote, sometimes a separate keyless entry unit and sometimes built into the head of the key, is a one way transmitter. Press a button, it sends a rolling code, the car's receiver acts on it. It handles locking, unlocking, the boot and the panic alarm, and nothing else. If it fails, the car still starts normally with the key.

A proximity or smart key is a two way device. It listens for the vehicle, answers a challenge, and is what permits the push button start to work at all. Losing one is closer to losing a key than to losing a remote, and replacing it involves the immobiliser rather than just the receiver.

So the first question on the phone is whether your car has a key you turn or a button you press, because that single fact separates a quick pairing job from an immobiliser job.

A meaningful share of dead fob calls turn out not to need programming at all, and all four checks cost nothing.

Replacement fobs come in three grades and the price gap between them is large enough that it is worth understanding what you are choosing.

An original manufacturer fob is the part the dealer supplies. It works, it fits, and it costs the most. A quality aftermarket fob from an established supplier is typically far cheaper and programs and performs identically on most mainstream vehicles. A cheap unbranded fob from an online marketplace is where the trouble is: the common failure modes are a chip that will not accept programming at all, a case that does not quite fit the blade, buttons that fail within months, and on proximity fobs a poor antenna that gives you half the detection range you should have.

There is a second problem specific to smart keys. Some proximity fobs are single use, meaning that once they have been paired to a vehicle they cannot be paired to a different one. A used fob bought online may already be locked to somebody else's car and is then simply scrap.

If you are supplying your own fob, tell us the part number before the visit. We would rather check compatibility in advance than arrive and find the part will not take.

There are three routes, and which one applies depends entirely on the vehicle.

Some vehicles support an onboard procedure: a sequence of ignition cycles, door operations and button presses, using an existing working key, that puts the receiver into learn mode. Where this exists it is quick and needs no equipment. Manufacturers have steadily removed it from newer models.

Most vehicles need a diagnostic tool connected to the OBD port under the dashboard, which authenticates to the immobiliser and writes the new credential. This is the standard route and it is what the equipment on the van is for.

A minority of vehicles, generally where all keys are lost or where the manufacturer has locked down OBD access, need the module itself to be read directly. That is a longer job and it is one of the cases where we will tell you honestly whether it is worth doing at the dealer instead.

In all three cases, if the vehicle has a security wait period, and several makes do, the clock runs regardless of how good the equipment is. Ten to thirty minutes of nothing happening is a normal part of the job on those cars.

On most vehicles the programming procedure rewrites the full list of authorised keys rather than adding one to it. That means every fob that is not physically present during the session stops working.

This is a feature and not a bug. If you have lost a fob, you want the lost one dead, and this is exactly how that is achieved. But it catches people out in one specific situation: a two car household where the second driver's fob is in a pocket across town during the appointment. That fob will need reprogramming afterwards.

So the rule is to bring every fob you want to keep working to the appointment, including the spare in the kitchen drawer. It costs nothing to have them present and it saves a second visit.