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call or notify a bone/junk yard they have the cross reference charts for vehicle parts or try a gm dealer these are a few that are compatible 97-99 Pontiac Bonneville SE 6Cyl 3.8L 231CID VIN K Fit Note Engine VIN: K, Naturally Aspirated 97-99 Pontiac Bonneville SSE 6Cyl 3.8L 231CID VIN K Fit Note Engine VIN: K, Naturally Aspirated 98-99 Buick LeSabre ALL ALL 97 Buick LeSabre ALL ALL Fit Note With Harness Codes: HEN, HER 97-99 Oldsmobile 88 ALL ALL 97-99 Oldsmobile LSS ALL ALL Fit Note Engine VIN: K, Naturally Aspirated 97-98 Oldsmobile Regency ALL ALL
There are 15 possible codes. They are listed on this site. It is possible to bypass that part of the system and then use a regular key. With a little effort and know how, you could fix this rather cheaply. Alot of info on this site.
Use a small piece of wire like a paper clip bent to a long U shape.
With the key on, engine off, short (connect) the two right most terminals in the upper row of the diagnostic connector under dash.
Diligently observe the flashes of the check engine light and count the long/short blinks, make note of them and check them against a table of codes (they represent two digit numbers). Look online at BATauto.com for this info. Reset by disconnecting the negative battery cable briefly (be sure you have codes for any alarm or radios, and cna rest the clock first).
You can call up the dealer and see how much it's going to cost there for the codes, but try 0000 first. If that does not work. try www.radio-code.com they can get your radio working again. Good luck and keep me posted