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replace the right rear bulb. the quick flashing indicates a bad bulb. it could be a wiring problem to the rear for the signal light that you will have to check out starting at the socket and working forward.
The rapid flashing occurs because of the light problem. If the 20A PARK LP fuse in the underhood fuse block is OK, the front marker lamps and the park lights should turn on when you set the headlamp switch to PARK. If the 10A T/SIG fuse in the instrument panel fuse block is OK, and the ignition switch is on, moving the turn signal multi-function switch to signal a right or left turn should cause the turn signals to flash. If this doesn't happen, check for a missing ground connection to the socket you replaced and check to be sure the replacement lamp was not forced into the socket backwards (it happens).
Good job, and good joe to you for solvin it! Now you'll remember that's a common indicator of a burnt out bulb. For some reason I can't explain, that is how a bad bulb acts on the flasher unit - by more rapid clicking (breaking contact inside the flasher relay at a quicker rate). It seems both the front and rear signal lights have to be working for the normal flasher rate ...well good.
Fast flashing occurs when one or more signal lights burn out on that side--front or rear. Other than the stress of turning the lamps off and on, the flasher should not cause rapid burn-out of any lamps. If any lamp doesn't work even with a new bulb, check for a poor grounding connection locally.
I assumer you're getting a a "check left turn signal" error message too? The rapid flash is the car's way of letting you know you've got a bulb out. The front bulbs can be tricky since they're double filament. If one filament is out the light may look dim. Set the hazards on and inspect. Last time this happened to me on my 2001 S60, the bulb was fine and the socket was flaky. You may need to clean the contacts and check the resistance from the plug to the socket. Mine is working now - for the time being. I hope it's not your front bulb because you have to remove the air filter to get to it. Good luck!