Selecting spark plugs is a seemingly simple task, but a mistake here can be costly, from increased fuel consumption to engine detonation and major repairs. Japanese brand Denso - one of the market leaders, supplying original candles to conveyors Toyota, Honda, Nissan and other manufacturers. However, even in the official catalog it is easy to get confused: what do the markings mean? IK20, VK20 or TT? How to avoid running into a fake? And why can spark plugs with the same heat rating behave differently on your engine?
In this article we will analyze 4 reliable selection methods candles Denso by car make - from online catalogs to manual checking by VIN. You will also find out which models of candles are most often counterfeited (spoiler: these are IKH20TT and VK20Y), how to recognize a counterfeit by 3 external signs, and why even “correct” spark plugs can cause misfires. At the end - exclusive compatibility table for popular cars from 2018–2026, which is not on the official website Denso.
1. Official methods for selecting Denso spark plugs
Brand Denso offers several tools for selecting parts, but not all of them are equally convenient. Let's look at the pros and cons of each.
Method 1: Catalog on the Denso website. Go to official website, select the section “Selection of parts” → “Spark plugs”. Here you can search by:
- 🔍 VIN code (the most accurate method, but not all cars are supported)
- 🚗 Make/model/year (works for 90% of machines, but may display outdated part numbers)
- 🔧 Original candle code (if you know the article number that came from the factory)
Method 2: Mobile application Denso Parts Finder. Available for Android and iOS, downloaded for free. The advantage is the offline mode (the database weighs ~500 MB). However, the interface is not Russified, and for some models (for example, Kia Rio 4 2023) may produce outdated SKUs.
Method 3: Contact your dealer. If your car is under warranty, it is better to check the part number with an authorized dealer. For example, for Toyota Camry 2.5 (2020–2026) dealers recommend Denso FK20HR11, although the online catalog may indicate IFH20TT.
⚠️ Attention: Online catalogs Denso sometimes they give out candles with overestimated heat number for turbocharged engines. Always check the recommendations with your car's manual! For example, for Volkswagen Tiguan 2.0 TSI the catalog can offerIKH24, whereas the factory manual requiresIKH22.
2. Decoding the Denso spark plug markings: what the letters and numbers mean
Candle marking Denso consists of 5–7 characters, where each element carries specific information. Let's look at the example of a popular model IKH20TT:
| Symbol | Meaning | Example |
|---|---|---|
| I | Thread diameter (14 mm) | I = 14 mm, K = 12 mm |
| K | Heat number (20) | K = 20, H = 22, J = 19 |
| H | Thread length (19mm) | H = 19 mm, E = 12.7 mm |
| 20 | Gap between electrodes (0.8 mm) | 20 = 0.8 mm, 16 = 1.1 mm |
| TT | Electrode type (thin iridium + platinum) | TT = iridium, Y = yttrium |
Pay special attention heat number - it shows the thermal characteristics of the candle. The higher the number, the “cooler” the candle (it removes heat better). Turbocharged engines usually require cooler plugs (e.g. IKH24 instead of IKH20).
Denso uses a unique notation system where the letter K corresponds to a heat number of 20, and H — 22. This is different from the standards NGK or Bosch, where numbers are specified directly (for example, NGK BPR6ES has a heat number of 6).
How to check the heat number without markings?
If the marking is erased, measure the length of the insulator skirt:
- 15–17 mm = “hot” spark plug (heat number 14–17)
- 10–12 mm = “cold” (heat number 20–24)
- 5–8 mm = “ultra-cold” (for racing cars, number 26+).
3. Selection of Denso spark plugs by car make: step-by-step instructions
If you don't trust online directories or want to double-check recommendations, follow this algorithm:
1. Find the VIN code of your car (usually on the windshield or in the title)
2. Check the original article number of the spark plugs in the manual or at the dealer
3. Compare the characteristics (thread, clearance, heat rating) with the Denso table
4. Make sure the selected model is suitable for your fuel type (petrol/gas)
5. Buy candles only from official distributors (list on the Denso website)-->
Step 1: Identify the original part number. For example, for Hyundai Solaris 1.6 (2017–2020) the factory provides spark plugs NGK IFR6A11. Their analogue from Denso — IFH20TT.
Step 2: Check compatibility parameters:
- 🔩 carving: 14 mm (M14×1.25) or 12 mm (M12×1.25)
- 📏 Thread length: 19 mm (standard), 25 mm (long), 12.7 mm (short)
- ⚡ Gap: 0.8–1.1 mm for most injection cars
- 🔥 Heat number: 20–22 for naturally aspirated engines, 24+ for turbo
Step 3: Consider the operating conditions:
- 🚗 For cars on gas (gas) candles are required gap 0.7–0.8 mm (for example,
Denso WK20) - ❄️ In regions with frosts below -30°C, it is better to choose candles with platinum tip (
PK20PR-P8) - 🏁 For sports cars (for example, Subaru WRX) models with copper core (
IXUH22I)
⚠️ Attention: If you are traveling to methane (not propane-butane), spark plugs need to be changed every 30–40 thousand km — gas burns at a higher temperature, which accelerates wear of the electrodes. For methane Denso recommends the seriesW(for example,WK20).
4. Popular models of Denso spark plugs and their analogues
The table below shows current candlestick models for 2026 Denso and their analogues from other brands. These data are based on manufacturers' recommendations and tests from independent laboratories (e.g. ADAC).
| Model Denso | Analogue NGK | Analogue Bosch | Suitable for (examples) |
|---|---|---|---|
IKH20TT |
IFR6T11 |
FR7DPX |
Toyota Corolla 1.6, Honda Civic 1.8 |
VK20Y |
BKR6EY |
WR7DP |
Mazda 3 2.0, Ford Focus 1.6 |
FK20HR11 |
ILFR6A11 |
FR7LPP33 |
Toyota Camry 2.5, Lexus ES 350 |
IXUH22I |
IFR7G11 |
FR8DPX |
Subaru WRX, Mitsubishi Lancer Evo |
PK20PR-P8 |
PFR6G-11 |
FR7DPX |
Nissan Qashqai 2.0, Renault Duster 1.6 |
Please note: even if analogues have similar characteristics, resource may vary. For example, Denso IKH20TT lasts up to 100 thousand km, while its analogue NGK IFR6T11 - up to 80 thousand km. This is due to the different composition of the electrode alloys.
If you cannot find an exact analogue, focus on heat number and electrode material. For example, to replace Denso VK20Y Any spark plug with a heat rating of 20 and a nickel electrode is suitable (for example, Bosch WR7DP).
5. How not to run into a fake: 5 signs of counterfeit
According to Denso, up to 30% of candles on the Russian market are fakes. Counterfeit not only fails faster, but can also provoke detonation due to unstable spark. Here's how to distinguish the original:
- 🔍 Packaging: There is a hologram logo on the original box Denso, which changes color when tilted. Counterfeits often have blurry font or misspellings (e.g. "Denzo" instead of "Denso")
- 🔧 carving: On the original spark plugs, the threads are perfectly straight, without burrs. Counterfeit products often have rough edges or traces of paint on the coils
- ⚡ Electrode: In original iridium spark plugs (
TT) the central electrode has a diameter of 0.4 mm and a perfectly round cross-section. For fakes, the electrode is thicker (0.6–0.8 mm) and may be oval - 📌 Marking: On original spark plugs, the markings are laser-applied and are not erased by friction. On fakes, the letters are often raised or easily scratched with a fingernail.
- 💰 Price: If candles
Denso IKH20TTThey sell for less than 800 rubles per piece, it is 100% fake. The original costs from 1200 rubles. per piece
Most counterfeited models:
IKH20TT(for Toyota and Honda)VK20Y(for Mazda and Ford)FK20HR11(for Lexus and Toyota Camry)
⚠️ Attention: Counterfeits are often sold under the guise of “universal” candles. For example, scammers may claim that Denso W20EPR-U11 Suitable for any car with 1.6–2.0 engine. This is not true! There are no universal spark plugs - each model is developed for specific engine parameters.
Buy candles only from official distributors Denso in Russia: Denso Automotive Systems Rus LLC, AutoAlliance, Exist. Full list - on the website denso-am.ru.
6. Frequent selection mistakes and their consequences
Even experienced car owners sometimes make mistakes when choosing spark plugs. Let's look at the most common mistakes and what they lead to:
- 🔥 Incorrect heat rating: Installation of “hot” spark plugs (
IK16) in a turbocharged engine will lead to glow ignition (spontaneous ignition of the mixture from a hot candle). Symptoms: The engine continues to run after the ignition is turned off - ⚡ Gap Mismatch: A gap of 1.1 mm instead of the required 0.8 mm will cause misfire at high speeds. Especially critical for cars with HBO
- 🔩 Incorrect thread length: A plug with a long thread (25 mm instead of 19 mm) may rest against the piston, which will lead to engine destruction. Always check this setting!
- 🛢️ Ignoring fuel type: Spark plugs for gasoline (
IKH20TT) are not suitable for gas - they overheat and fail 2-3 times faster
Case Study: Owner Kia Sportage 2.0 T-GDI (2019) installed candles Denso IKH20 instead of recommended IKH24. After 5 thousand km detonation appeared, and diagnostics revealed valve burnout. The repair cost 80 thousand rubles.
To avoid mistakes, always check with three times:
- Recommendations from the car manufacturer (manual or dealer)
- Catalog Denso
- Reviews from the owners of your model on forums (for example, Drive2 or Club <your brand>)
7. Compatibility table for Denso spark plugs for popular cars (2018–2026)
This table is compiled based on data from official dealers and independent tests. Here are the exact articles, which are suitable for specific models (as opposed to universal recommendations from online catalogs).
| Make and model | Year | Engine | Recommended Denso spark plug | Notes |
|---|---|---|---|---|
| Toyota Corolla | 2018–2026 | 1.6 (121 hp) | IKH20TT |
For versions with HBO - WK20 |
| Honda CR-V | 2020–2026 | 1.5 Turbo (193 hp) | IKH24 |
Change every 60 thousand km (according to regulations) |
| Hyundai Tucson | 2019–2023 | 2.0 (150 hp) | IFH20TT |
Analogue of the original NGK IFR6A11 |
| Volkswagen Polo | 2021–2026 | 1.6 MPI (90 hp) | VK20Y |
Not suitable for versions with 1.4 TSI! |
| Mazda CX-5 | 2017–2026 | 2.5 Skyactiv-G (194 hp) | FK20HR11 |
0.9mm clearance required |
| Lada Vesta | 2018–2026 | 1.6 (106 hp) | WK20 |
Best option for gas |
Important: For vehicles with start-stop (for example, Toyota Corolla Hybrid) spark plugs are required platinum tip (PK20PR-P8), since frequent engine starts accelerate wear of the electrodes.
FAQ: Answers to frequently asked questions
Is it possible to install Denso spark plugs with a higher heat rating than recommended?
No! Candles with overestimated heat number (for example, IKH24 instead of IKH20) will be less able to self-clean from carbon deposits, which will lead to misfires at low speeds. The exception is if you have tuned the engine (increased the compression ratio or installed a turbine).
How often to change Denso spark plugs on gas?
On propane-butane — every 60–70 thousand km, for methane — every 30–40 thousand km. The gas burns at a higher temperature, which accelerates the wear of the electrodes. For HBO it is better to choose candles with yttrium coating (series VK or W).
What is the difference between Denso iridium spark plugs (TT) and platinum spark plugs (P)?
Iridium (TT) have thinner central electrode (0.4 mm versus 0.7 mm for platinum), which improves ignition of the mixture and reduces fuel consumption by 2–3%. However, platinum (P) are cheaper and better suited for cars with high sulfur content in gasoline (iridium oxidizes faster).
Is it possible to clean Denso spark plugs from carbon deposits?
Cleaning is only possible for nickel spark plugs (series W or K). Iridium and platinum spark plugs (TT, P) cannot be cleaned mechanically (sandblasting, brushing) - this will damage the coating. Allowed only ultrasonic cleaning at the service center.
Why do new Denso spark plugs cause misfires?
There are several reasons:
- Incorrect gap (need to be checked with a feeler gauge and adjusted)
- Incompatible heat number (too “cold” or “hot”)
- Defective or counterfeit (check packaging and labeling)
- Problems in the ignition system (coils, wires, ECU)
Check first compression in cylinders and coil condition. If everything is in order, return to the original spark plugs.