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Spare parts reviews ➔ All comparisons ➔ Bosch ➔ Denso

Spark plug Bosch or Denso

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Bosch
Denso
Denso › Spark plug
EnoSoles
Rating 5.0

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
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Bosch › Spark plug
Wacky_Engineer1975
  • Starting:
Rating 5.0

It doesn't look eroded. It looks like the centre electrode tip has fallen off. That shouldn't happen. I usually only use Bosch or NGK plugs. I've never heard of Auto lite...

Pros: reliable
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Bosch › Spark plug
treegangster
  • Starting:
Rating 3.0

Changed valve cover/gasket and installed new Bosch plugs and NGK boots.

Car had slightly higher rpms at cold startup but didn\u2019t think anything was wrong. After a few days engine started to misfire. I did some research and it sounded like I should use OEM plugs. I purchased Nissan plugs from the dealer and replaced the Bosch plugs. Misfire went away, but higher rpms at cold start persisted.

Pros: misfire went away
Cons: higher rpms at cold start
Mileage: 90000 km
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Bosch › Spark plug
Br0boc0p
  • Acceleration:
Rating 3.5

Yes. However as a long time old car mechanic I learned the hard way some new cars are super picky about what spark plugs you put in them. It kind of caught me by surprise. Parts store gave me Bosch plugs their system matched to my GF's Pilot, and it fell on its face hard about a half hour into the next drive.

Pros: new cars picky about plugs
Cons: Bosch plugs caused issues
Vehicle: Honda Pilot
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Bosch › Spark plug
nock6687
  • Acceleration:
Rating 2.0

I have a 21 xlt 4wd 2.7 and I do A LOT of driving for work. Recently crossed 80k miles and it started misfiring like crazy shortly after that and threw a code. Pulled the plugs and they were definitely fouled. I did some reading and saw most people change the plugs out around this interval so I went ahead and did it. EVERY auto part store near me only had 1 or 2 oem plugs and I couldn\u2019t really wait so I went ahead and got BOSCH iridium plugs. Well I\u2019m noticing when I get on it or go to speed up at higher RPMs/gears, I\u2019m getting what feels like stuttering or very minor misfires every now but it\u2019s not throwing any codes.

Cons: stuttering, minor misfires
Mileage: 128747 km
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Denso › Spark plug
unfer5
  • Starting:
  • Acceleration:
Rating 1.0

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
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Which spark plug to choose — Bosch or Denso?

If choosing spark plug across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.

We compare spark plug across these categories:

Comparison of spark plug Bosch and Denso
  1. PR Score.
  2. Overall ranking.
  3. Vote balance.
  4. Average rating.
  5. Number of reviews.
  6. Feature ratings.
  7. Car owners’ choice.

Which spark plug are better — Denso or Bosch?

In March 2026 on PartReview, spark plug Denso were overall better than Bosch.

  1. Bosch received a PR Score of 61 out of 100, and Denso scored 78 points.
  2. Bosch ranked 3 in the overall ranking, and Denso ranked 2.
  3. The average rating is higher for Denso (3.9) than for Bosch (3.3).
  4. Spark plug Denso have better feature ratings than Bosch:
    • Idle - owners believe, that this property for Denso is better than Bosch.
    • Acceleration - drivers claim, that this property for Denso is outperforms Bosch.
    • Starting - reviews suggest, that this property for Denso is preferred to Bosch.

Which spark plug are more popular — Bosch or Denso?

Spark plug Bosch and Denso were equally popular according to data in March 2026.

By vote balance, spark plug Denso surpassed Bosch:

  • For Bosch, the ratio of positive (515) to negative (317) votes is 198 votes.
  • For Denso, the ratio of positive (447) to negative (123) votes is 324 votes.

By number of reviews, spark plug Bosch surpassed Denso:

  • For spark plug Bosch there are 264 reviews: 145 positive, 40 neutral, 79 negative.
  • For spark plug Denso there are 184 reviews: 137 positive, 18 neutral, 29 negative.

Which spark plug do car owners prefer — Bosch or Denso?

In March 2026, according to PartReview, spark plug Bosch led more car-specific ratings than Denso:

Bosch are chosen by owners of cars such as: Nissan Altima, Audi S4, Ford Ranger, Volkswagen Beetle, Volkswagen Corrado, and others.

Spark plug Denso have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.

Other comparisons of spark plug

If this comparison didn’t fully answer your question, there are many others on PartReview.

For example, comparisons of spark plug Bosch with: NGK, Autolite, Champion, AC DELCO, BRISK, OEM Volkswagen, OEM Toyota, Motorcraft, OEM FORD, OEM BMW.

Also available: comparisons of spark plug Denso with: NGK, Autolite, Champion, AC DELCO, BRISK, OEM Volkswagen, OEM Toyota, Motorcraft, OEM FORD, OEM BMW.

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.

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