First off, let’s keep it simple: the Chery A5 Right Rear Lamp A21-3773020 isn’t just a “single light”—it’s a full, factory-built assembly for your A5’s right rear end, acting like your car’s “rear safety signal hub.” Think of it as the way your A5 “talks” to other drivers: when you hit the brakes, turn, or back up, this lamp flashes or lights up to tell everyone behind you what you’re about to do. It’s not just for looks—without it, other cars won’t know if you’re stopping suddenly or reversing, which is a huge accident risk, especially in traffic or at night.
This right rear lamp is only for Chery A5 models on the A21 platform—mostly A5 variants from 2006 to 2012 (always double-check your car’s VIN or owner’s manual to confirm!). It’s designed to fit your A5’s rear bodywork like it was there from day one: the mounting holes line up perfectly with the pre-drilled spots on the right rear quarter panel, the outer shell matches the A5’s sleek shape (no weird gaps that let in rain), and the wiring connector plugs straight into your car’s existing rear light harness—no cutting wires or jerry-rigging needed. Grab a generic rear lamp? You’ll run into headaches: dim lights that other drivers can’t see, water leaking inside (which shorts out the bulbs), or a loose fit that rattles every time you hit a bump. Total safety fail.
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This is one of the easiest parts to replace on your A5—all you need is a screwdriver. Here’s how:
Access the lamp from inside: Open your A5’s trunk, and pull back the fabric trim panel on the right rear side (it’s held on by plastic clips—just gently pry them with a flathead screwdriver).
Unplug the old lamp: You’ll see the wiring connector behind the lamp—press the tab and pull it out (it’ll click when it comes loose).
Remove the old lamp: Use a Phillips screwdriver to take out the 2–3 small bolts holding the lamp to the rear bodywork. Then gently pull the old lamp straight back—don’t yank it (it might stick a little).
Install the new one: Line up the A21-3773020 lamp with the mounting holes, screw in the bolts (don’t over-tighten—you’ll crack the plastic!), and plug in the wiring connector.
Test it: Turn on your A5, hit the brakes, flip the right turn signal, and put it in reverse to make sure all the lights work. If something’s off, check the connector—you might not have plugged it in all the way.
Wipe the lens weekly: Dirt, mud, or bug splats on the outer shell make the lights dimmer. Use a damp cloth to clean it—avoid harsh cleaners (they’ll scratch the plastic).
Check bulbs monthly: If a light stops working (e.g., brake light is out), replace the bulb right away (it’s illegal to drive with broken rear lights!). Just pull the lamp out (like in step 3) and twist the bulb socket to remove the old one.
Inspect the seal every 3 months: After heavy rain, look inside the lamp (through the trunk trim) for condensation (foggy glass). If you see it, the seal is worn—ask Chery for a replacement gasket. Condensation will rust the bulb sockets over time.
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Summary
The original A21-3773020 actually passes Chery’s tests with flying colors—it takes extreme temps, from -30°C all the way up to 60°C, never leaks, and all the lights are bright enough that other drivers can spot ’em from way off. It’s not just some random lamp—it’s the peace of mind knowing other drivers will “get” what your A5’s up to, no matter what the weather’s like.
Bottom line, the Chery A5 Right Rear Lamp A21-3773020 is your car’s “rear safety communicator.” It lets other drivers know when you’re hitting the brakes, turning, or backing up, fits your A5 like it was made for it, and it’s super easy to install. Stick with the original part, keep it clean—you’ll never have to stress about other drivers missing your signals again.
![A21-3773020]( "A21-3773020")
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![A21-3773020]( "A21-3773020")
