Review on 4 Button Keyless Entry Remote Key Fob for A3 A4 A6 A8 TT Q7 S6 | Replacement Control Key with No Chips | Compatible with MYT8Z0837231, 4D0837231E, 4D0837231P by Adam Davidson

2.5 stars rounded up to 3. I recently bought a used Audi and didn't like that the key fobs were worn out. They were pretty slick, like an old keyboard where the keys had lost their matte finish. Overall, the new case feels sturdy in the hand and will definitely do the job, but it took a long time to fit, which probably wasn't worth the time. First, there weren't any specific instructions on what to do with the key fob and there are multiple places to hang up. Here are a few things I noted: 1) YouTube has instructions on how to remove the back cover. In the well where the key is locked, you need to click on the ledge. push it out 2) Once it's removed, you'll need the world's smallest star wrench or you're ready to crack the case open. I have a set of sprocket/torx wrenches, but here are two that are a few sizes smaller than the smallest one I have. I decided to hack it. 3) Audi has melted down the plastic case in some places to hold the motherboard in place. You should grab a razor and give it a good shave to free yourself. Only then can you pull out the circuit board. 4) There is an RFID chip in the top right corner of the case, under the circuit board. This is perhaps the most difficult part of the disassembly. The chip is encased in melted plastic. It will take some time and skill to carve it with a razor or exacto knife. Be careful as I'm sure breaking the glass will render the keychain useless. If you don't tape it, it will wobble and rattle. I did this and once installed it was extremely difficult to remove the carrying case. 6) Make sure the battery contacts are well connected to the circuit board. It's easy to screw up. You should almost be pushing the motherboard out of the case. 7) Although all the supplied parts fit together perfectly, the locking surfaces of the spring loaded knob, key and body do not mate exactly after installation. This creates pressure and ensures the button doesn't pop out too far. It took a lot of trial and error to cut the plastic to get it working properly. Quality Differences: The OEM key fob was definitely better overall quality. Although I didn't take photos, the secondary fob lacked rubber grommets (to keep water out) and gold-plated battery contacts (better for power delivery). The new key fob had slightly larger gaps in the plastic parts and the panic button was cheap bright red plastic. I only used the original. Apparently the Audi logo is missing, if that matters to you. Now that I've done everything I think it looks and feels great. Spring is so much better and more positive and I love the new matte finish. However, I have no plans to buy a second one as I don't think it was worth it. All interior photos are taken with an old key fob as I didn't want to open a new one.