This will vary depending on vehicle year which wasn't provided. Toyota 4Runner headlight bulb replacement: Purchase the correct replacement headlight bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement bulb information. Then consult your owner's manual for the headlight bulb replacement procedure. As simple as it sounds, the owner's manual is the best place to start for bulb replacement instructions and illustrations. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).
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If you're talking about the headlight, the "lens cover" is not a separate part, you need to replace the whole headlight assembly.
Take out the headlight is the easiest way!
To replace the rear bulb in a Toyota 4Runner remove the plastic covers located in the trunk. Taking off the plastic covers will reveal the taillight housing and bulbs. Replace the bulbs.
How do you replace a 1999 Ford Escort headlight - could use a picture.
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go to back of headlight assembly and twist it out.
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detach the bulbs and remove the clips behind the headlight assembly
it is behind the passenger side headlight assembly. you will have to remove the headlight assembly to replace it.