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Ignition coil most likely. I have done many dozens of them. Takes about 2 minutes to replace.
I did absolutely nothing apart of spark plugs and oil change . I had E90, 188k km, 330d until it meet it's end when I crash it to railguards. it never showed me any lights or anything so I would say around 60-80$ tops.
I recently got Denso (OEM) from my local o’reillys cheaper than the dealer (~$80).
Bro ABSOLUTELY do the spark plugs yourself. I bought oem Denso spark plugs from Napa Auto for about $180. Then all you need is a spark plug socket w/ swivel head, 10mm socket, 12mm, a couple extensions, needle nose pliers, dielectric grease, and a pick to make life easier.
Denso iridium spark plugs
New Denso Platinum spark plugs. Car drives great, no codes, no sputtering or stalling or hesitation.
I did my spark plugs on my 335i f30 and I can say one thing. $400 for labor on spark plugs is treason. Shit should take those "experienced" mechanics maybe an hour.
Swapped the NGKs (around 60k miles on them) for new OEM Denso plugs. That stopped the shaking for about two days, then it came back.
I’ve had several Denso plugs do this on a couple Camrys I service, and our own. All 2.4 cars. Caused tow ins for both husband and wife’s cars. I’ve fired denso as a spark plug provider, too many failures.
I wish my Toyota 4Runner spark plug service was that cheap in the Toyota dealer. I was quoted $800 parts + labor for OEM Denso.
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We compare spark plug across these categories:
In March 2026 on PartReview, spark plug Denso were overall better than OEM BMW.
In March 2026 on PartReview, spark plug Denso were overall more popular than OEM BMW.
By vote balance, spark plug Denso surpassed OEM BMW:
By number of reviews, spark plug Denso surpassed OEM BMW:
In March 2026, according to PartReview, spark plug OEM BMW and Denso have not taken top places in car-specific ratings. You can help by adding your review about these manufacturers.
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You can also see who is better among other spark plug manufacturers: Bosch or NGK, NGK or Denso, NGK or Autolite, NGK or Champion, NGK or AC DELCO.