According to the user's manual, you need to take it to the dealership to do the job. I suggest you compare the price of fixing it in the dealership with the price of new/used ones in local Ebay, as there are separate ones available for each side.
how can i change bulb
To change an indicator bulb on a Peugeot 307, first, ensure the vehicle is turned off and the key is removed from the ignition. Open the relevant side's door and locate the indicator light assembly; you may need to access it from the wheel arch or under the hood depending on the model. Remove the bulb holder by twisting it counterclockwise, then pull out the old bulb and replace it with a new one, making sure it's securely fitted. Finally, reinsert the bulb holder and test the indicator to ensure it’s working properly.
To change the rear indicator light bulb on a Peugeot 307, first, open the boot and locate the access panel behind the rear light cluster. Remove the panel by unscrewing or unclipping it, depending on the model. Once accessed, twist the bulb holder counterclockwise to release it, then pull out the old bulb and replace it with a new one. Finally, reinsert the bulb holder, secure the access panel, and test the indicator light to ensure it’s working.
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take off the frontunscrew the bulbput the new bulb input front back
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break it
To change the indicator switch on a Peugeot 307 SW, first disconnect the car battery to ensure safety. Remove the steering column cover by unscrewing any screws and gently prying it apart. Then, locate the indicator switch, disconnect the wiring harness, and remove the switch by unscrewing it from the steering column. Finally, install the new switch, reconnect the wiring, reassemble the steering column cover, and reconnect the battery.
You will have to buy a new bulb,then remove the old one and replace with new.