Ignition coil most likely. I have done many dozens of them. Takes about 2 minutes to replace.
Pros: easy to replace
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I recently got Denso (OEM) from my local o’reillys cheaper than the dealer (~$80).
Pros: cheaper than dealer
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.
Pros: save money, easy job
Cons: time consuming for beginner
Denso iridium spark plugs
Pros: improved engine performance
Vehicle:
Toyota
New Denso Platinum spark plugs. Car drives great, no codes, no sputtering or stalling or hesitation.
Pros: car drives great, no sputtering
Vehicle:
Toyota MR2
Fitting a decent set (Denso or NGK) of iridium plugs is also worthwhile.
Pros: worthwhile
Vehicle:
Subaru Legacy
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.
Pros: null
Cons: too many failures
Vehicle:
Toyota Camry
Denso 3457 (FXE24HR11)
Why? It's the plug recommended in the owner's manual and I have never seen anyone have issues with this plug.
Why are they noticeably better than other equivalent plugs from reputable brands, I honestly don't know as it seems that the differences should be negligible. Plugs are one of the areas where the car is very fussy.
Pros: no issues, recommended by manual
Cons: negligible difference from others
Vehicle:
Infiniti
Part number: 3457 (FXE24HR11)
I finally changed out the OG Denso spark plugs on my wife's '10 RX350 at a shameful 415,000 kms. Wasn't idling rough but some low-rpms hesitation. Plugs still basically worked fine, though.
Pros: worked fine, very durable
Cons: low-rpms hesitation
Vehicle:
Lexus
Mileage: 415000 km
I wish my Toyota 4Runner spark plug service was that cheap in the Toyota dealer. I was quoted $800 parts + labor for OEM Denso.
Pros: OEM Denso parts
Cons: expensive parts and labor
Vehicle:
Toyota 4runner
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What we know about Denso spark plug
The brand is registered in Japan.
In March 2026, PartReview users have a mixed opinion of Denso spark plug.
PR Score — 78 out of 100, based on 184 reviews and 570 votes. 137 positive reviews, 18 neutral reviews, 29 negative reviews. Average rating — 3.9 (out of 5). Vote balance: 447 up, 123 down.
In the ranking of the best spark plug this part is at position 2, behind NGK , but ahead of Bosch and BRISK.
Users also evaluated the qualities of Denso spark plug:
- Starting - cold starts are difficult - rated positively. 3.8 points out of 5.
- Idle - engine shakes and runs unevenly at idle - rated positively. 3.8 points out of 5.
- Acceleration - hesitation or stumbling when speeding up - rated positively. 3.7 points out of 5.
Spark plug Denso in car-specific ratings
See which car brands and models owners choose Denso spark plug for. Below are car-specific ratings where this part is in the Top-3:
- Denso ranked #2 for: Ford Mustang, Volkswagen Golf, Audi A3, Honda Civic, Honda Fit .
- Denso ranked #3 for: Honda Accord, Toyota Corolla, Toyota Camry, Toyota 4runner .
Spark plug Denso in comparisons
There are 16 comparisons of Denso spark plug with other manufacturers on PartReview.
In particular, see which spark plug are better: Denso or OEM Mazda, Denso or OEM Honda, Denso or OEM Audi, Denso or OEM Subaru, OEM BMW or Denso .