Sedan I presume?
What year? They weren't all exactly identical.

You have to replace all those bulbs in pairs in consideration of the way the bulb failure sensor works to detect dead bulbs. Keep the old if matched and working OK, but any replacing has to be done in pairs.

Some kind of mis-routing of wires causing odd warnings?
Or maybe a bad ground. Definitely clean up all grounds. Common cause of trouble.

Headlights and parking lights ground inside the fender. Drivers side is about even with battery or the power steering pump. Passenger side ground is on fender buried behind windshield washer reservoir. Minor PITA to get at it.

Rear tail lights (sedan) ground on the sheet metal near light assemblies; I'm sure you've already found those grounds. Make sure they're nice and clean.

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DAMHIK: Don't Ask Me How I Know - - - Sven: '89 245, IPD sways, electric rad. fan conversion, e-codes, 28+ mpg - auto tranny. 500 mi/week commute. '89 245 #2 (wifemobile). '90 244 (spare, runs).