Join Date: Sep 2005
Location: Bolton, Connecticut
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Re: Key Fob replacement issues...
Before you lost your one keyfob, you should have bought a spare. As long as you have one properly working keyfob the expensive re-seeding procedure is not required. You are lucky though that this moderately expensive re-seeding process was developed, because before that came about the dealer had to replace the smartkey ECU for about $1,000 & then reprogram the car to accept the new fobs (fobs don't get programmed---the car does).
At this point unless you come up with the missing fob, re-seeding is your only option followed by the purchase of at least one fob. But if you don't buy a second one & get the dealer to program your car to accept both the new ones, then next time you lose the only one again it will be another re-seeding procedure. Unless you have your key code (for the hidden metal key) written down somewhere, the dealer will have to run the build sheet for your car to get the original key code to be able to laser cut your metal key (that lets you in the driver's door only).
Most times a fob bought off e-bay will NOT work as a smart key [you have no way of knowing for sure if it was ever used---the used ones (& maybe even a new e-bay one) will not let you into your car with even the push-buttons]. You will have to get in using the proper metal key in the driver's door & then insert the fob into the dash docking slot. However, since you will be getting the re-seeding done, an e-bay fob MAY work (although I doubt it). Your best bet is to buy 2 new fobs from the dealer (that way you know they've NEVER been used) & let the dealer program the ECU (after the re-seeding) to accept the new fobs. I don't think your old one (should you come across it) will work AFTER the re-seeding, but if you do find it before the dealer does the re-seeding, then you're in business to avoid the re-seeding cost (but do get a second fob right away & get them to program your car's ECU to accept the new one.
One more caution--- the fob(s) you get must have the silver logo (not black) & must be the part number for your model year (fobs from an '04 or '05 (and maybe '06 too) won't work in your 2008 car, so make sure your parts guy orders the proper one(s).
Ken (in Bolton,Ct) 2005 Pkg #4 (AM)