My 2009 BMW 328i had a P0304 cylinder 4 misfire code. So naturally, I went on Amazon and found these coils. These coils are advertised as Bosch OEM original coils. For $199.99 shipped via Prime, it was the cheapest fastest solution to solve my problem.
Items arrived next day in a very nice sealed box. The individual boxes are sealed with a proof of authenticity seal with a serial number. I went on Bosch’s website to verify the coils and they are indeed original.
When I opened the box, I discovered that the coils are made in Slovenia. This means that these are not OEM coils. They are Bosch aftermarket replacement parts. They also have some wear marks on the coils. When I install the coils, the electrical connector tabs do not snap in place snugly like the OEM coils. This means that under severe vibration, the electrical connector may come loose and disconnect.
After I installed all the coils, I proceeded to start the car. The car wouldn’t start. I checked all the electrical connections and ensuring the coils are pressed all the way in. Car still wouldn’t start. I proceeded to reinstall all 6 of the old coils back into the car, the car started right up.
I’m not sure if there’s something wrong with just one of the new coils or all six coils are bad, but I didn’t have time to diagnose the coils one by one. Also, since these coils are sold in a pack of 6, I will have to return all six together. So there’s no point for me to diagnose which of the new coils are bad.
EDIT: After reading all the 1 star reviews of this listing, I learn that there is a small plastic tab under the electrical connector of the coils. The tab needs to line up like on the original coil you are replacing. This may explain why the connectors on my car did not fit snugly these coil. Before you buy this coil, check your old coils and make sure it is the same as this one before buying. It will save you a lot of time.
| Manufacturer | Bosch |
|---|---|
| Place of Business | Farmington Hills, MI 48331, US |
| Brand | Bosch |
| Model | 0221504470 |
| Product Dimensions | 27.94 x 20.32 x 15.24 cm; 907 Grams |
| Item model number | 00044 |
| Is Discontinued By Manufacturer | No |
| OEM part number | 12137562744, 12137571643, 12137594937 |
| Item Weight | 907 g |
