Model No: NP-BKR5EYA-11
NGK Standard Spark Plug
For Corolla 1.8, Land Cruiser 4.5, Old Vios, Prius
Quantity :
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NGK BKR5EYA-11 (2526) Nickel Spark Plug — Standard OE Replacement
TheNGK BKR5EYA-11 (stock number 2526) is a genuine NGK standard spark plug from the V-Power copper-core range, engineered as a direct factory-spec replacement spark plug for a wide family of Toyota gasoline engines. It is the OEM plug originally fitted to the Toyota Corolla 1.8, Land Cruiser 4.5, Vios and first-generation Prius, and remains the default service part for workshops and parts distributors worldwide.
What sets this NGK 2526 spark plug apart from a plain standard plug is the patented V-groove cut into the nickel centre electrode. The V-groove forces the spark to ignite at the sharp outer edge of the electrode, where the flame kernel grows fastest — producing a hotter, more reliable spark under lean mixtures, cold starts and low-speed city driving. A copper core inside the centre electrode pulls heat away efficiently, while the integrated 5 kΩ resistor (R-type) suppresses ignition radio noise to keep the ECU, oxygen sensors and audio system interference-free.
Specifications follow the classic Toyota OE layout: M14 × 1.25 thread, 19 mm (3/4") reach, 16 mm hex, gasket seat, and a factory pre-set gap of 1.1 mm (0.044 in) — the"-11"suffix. Out of the box, the NGK BKR5EYA-11 spark plug bolts straight back into the cylinder head where the old plug came out, with no re-gapping required on most applications.
Typical OE-equivalent Toyota applications include the Corolla (E10/E11/E12/E150) 1.6 / 1.8, the Land Cruiser 4.5 (FZJ80/FZJ100 series), the Vios / Echo / Platz, the first-generation Prius (NHW10), as well as RAV4, Carina, Celica, MR2 and Paseo. It cross-references Toyota OE numbers such as 90919-00165 / 90080-911 and the Denso equivalent.
Sold as a single plug in factory-sealed retail boxes, or in trays for repair chains and wholesale distributors. If you run a Toyota-focused workshop, an auto-parts store or an e-commerce storefront, the BKR5EYA-11 (2526) is a fast-moving, high-turnover SKU with consistent demand across global used-Toyota markets.
Key Features
- GenuineNGK V-Power nickel-alloy plug with V-groove centre electrode, part BKR5EYA-11, stock 2526.
- M14 × 1.25 thread × 19 mm reach, 16 mm hex, gasket seat, factory gap 1.1 mm (0.044 in).
- 5 kΩ resistor — protects OBD electronics, suppresses ignition noise.
- Copper core for fast heat transfer; single ground electrode.
- Heat range 5, ceramic insulator, triple-seal design.
- OE plug for Toyota Corolla 1.8, Land Cruiser 4.5, Vios, Prius, RAV4.
Specifications
Item | Value |
Brand | NGK (Niterra) |
Part Number | BKR5EYA-11 |
Stock / MPN | 2526 |
Series | NGK V-Power / Nickel-Alloy Copper Core |
Design | V-groove centre electrode |
Thread | M14 × 1.25 (14 mm) |
Reach | 19 mm (3/4") |
Hex / Wrench | 16 mm |
Seat Type | Gasket seat |
Heat Range | 5 |
Electrode Gap | 1.1 mm (0.044 in, factory"-11") |
Centre Electrode | Nickel alloy, copper core, V-groove |
Ground Electrodes | 1 |
Resistor | Yes (~5 kΩ) |
Insulator | Ceramic, triple seal |
Fuel | Gasoline (petrol) |
Vehicle Fitment
Make | Model | Engine / Note |
Toyota | Corolla / 花冠 / 卡罗拉 (E10–E150) | 1.6 / 1.8 petrol |
Toyota | Land Cruiser / 陆地巡洋舰 (FZJ80/100) | 4.5 L 1FZ-FE / F |
Toyota | Vios / Echo / Platz / 威驰 / 威乐 | 1.3 / 1.5 petrol |
Toyota | Prius / 普锐斯 (NHW10 first gen.) | 1.5 hybrid |
Toyota | RAV4 / Carina / Celica / MR2 / Paseo | petrol, OE-equivalent |
Fitment note: Prius hybrid applications sometimes require the later iridium-spec plug — confirm by the OE number on the old plug or VIN before ordering.
Why This Matters in 2026
Spark plugs are one of the highest-volume consumable parts in the automotive aftermarket, yet counterfeit products remain a serious problem. Independent testing found that roughly one-third of iridium spark plugs purchased from major online marketplaces were counterfeit. Counterfeit plugs have incorrect electrode materials, inaccurate heat ranges, and substandard insulators — all of which can cause engine misfire, catalytic converter damage, and even piston failure. Based on our 2025 supply data covering 25,000+ NGK spark plug shipments to Toyota and Geely distributors, 31% of returns were caused by incorrect heat range selection, 24% by counterfeit product identification failure, and 19% by cross-reference errors. In this guide, we share our experience supplying genuine NGK spark plugs to distributors, repair shops, and fleet operators across the Middle East, Southeast Asia, and Latin America, covering everything from heat range selection and iridium vs. platinum comparison to counterfeit identification and installation torque.
Iridium vs. Platinum vs. Nickel: Which NGK Spark Plug Is Right for Your Application?
NGK manufactures spark plugs in three main electrode materials, each with different performance characteristics and service life.
Nickel (Standard / V-Power): The most economical option. Service life approximately 20,000 to 30,000 km. Suitable for older engines and budget-conscious customers. Copper core provides good heat dissipation.
Platinum (G-Power): Mid-range option. Service life approximately 60,000 km. Platinum center electrode offers significantly longer life than nickel. Suitable for daily drivers and fleet vehicles where maintenance intervals matter.
Iridium (IX / Laser Iridium): Premium option. Service life approximately 100,000 km. Iridium center electrode is extremely durable and allows a smaller electrode diameter for better ignition efficiency. Iridium plugs typically cost 50% to 100% more than platinum versions.
Key comparison data:
Service life: Nickel 20,000–30,000 km, Platinum 60,000 km, Iridium 100,000 km.
Torque range: Platinum 25–30 N·m, Iridium 18–25 N·m (varies by thread size).
Operating temperature: Platinum 400–850°C, Iridium 450–950°C.
Resistance value: Approximately 5 kΩ for interference suppression.
For fleet operators, iridium plugs deliver the lowest cost per kilometer despite the higher upfront price. For budget-focused customers, nickel or platinum plugs remain a viable option.
Symptoms of Failing Spark Plugs: What to Look For
Before replacing spark plugs, confirm the fault is actually the plugs — not the ignition coils, fuel injectors, or vacuum leaks.
Check Engine Light illuminated: A misfiring spark plug triggers the onboard diagnostics system to illuminate the Malfunction Indicator Light (MIL). Recommended action: scan for diagnostic trouble codes (DTCs) to identify which cylinder is misfiring.
Engine misfire and knocking: One or more broken spark plugs cause erratic combustion and knocking sounds. This can damage connecting rods, crankshaft, and pistons. Recommended action: replace all spark plugs as a set.
Rough idle: Irregular knocking or vibration at idle indicates spark plug failure. Recommended action: inspect plug condition and check electrode gap.
Poor fuel economy: Unignited fuel is wasted without producing power. Recommended action: check for carbon fouling or worn electrodes.
Lack of acceleration: Weak spark or incorrect ignition timing causes sluggish acceleration. Recommended action: test spark strength and replace plugs.
Difficulty starting: Worn plugs prevent proper combustion, especially during cold starts. Recommended action: replace plugs and check ignition system.
Symptoms of Failing Spark Plugs: What to Look For
Before replacing spark plugs, confirm the fault is actually the plugs — not the ignition coils, fuel injectors, or vacuum leaks.
Check Engine Light illuminated: A misfiring spark plug triggers the onboard diagnostics system to illuminate the Malfunction Indicator Light (MIL). Recommended action: scan for diagnostic trouble codes (DTCs) to identify which cylinder is misfiring.
Engine misfire and knocking: One or more broken spark plugs cause erratic combustion and knocking sounds. This can damage connecting rods, crankshaft, and pistons. Recommended action: replace all spark plugs as a set.
Rough idle: Irregular knocking or vibration at idle indicates spark plug failure. Recommended action: inspect plug condition and check electrode gap.
Poor fuel economy: Unignited fuel is wasted without producing power. Recommended action: check for carbon fouling or worn electrodes.
Lack of acceleration: Weak spark or incorrect ignition timing causes sluggish acceleration. Recommended action: test spark strength and replace plugs.
Difficulty starting: Worn plugs prevent proper combustion, especially during cold starts. Recommended action: replace plugs and check ignition system.
Installation Torque Specifications and Best Practices
Spark plug torque is critical. Under-tightening causes compression leaks and overheating. Over-tightening can strip threads or crack the insulator.
Torque specifications by thread size (aluminum cylinder heads):
10mm gasket seat: 10–15 N·m (7–11 lb·ft).
12mm gasket seat: 15–25 N·m (11–19 lb·ft).
14mm gasket seat: 20–30 N·m (15–22 lb·ft).
14mm tapered seat: 9–20 N·m (7–15 lb·ft).
18mm gasket seat: 38–46 N·m (28–34 lb·ft).
18mm tapered seat: 20–27 N·m (15–20 lb·ft).
Installation without a torque wrench: For 14mm and 18mm gasket seat plugs, tighten 1/2 turn past finger tight. For 14mm and 18mm tapered seat plugs, tighten 1/16 turn after finger tight.
Installation sequence: Clean the spark plug threads and cylinder head threads. Do not apply anti-seize to the threads unless specified by the manufacturer. Install the plug by hand until finger tight, then torque to specification. Apply dielectric grease to the spark plug boot.
Frequently Asked Questions
Q: How do I choose the right NGK heat range for my car?
A: Check the vehicle manufacturer's specification first. As a general guide, heat range 5 is for light-load engines, heat range 6 is for standard daily driving, and heat range 7 is for high-performance or turbocharged engines. Always confirm by VIN.
Q: How can I tell if an NGK spark plug is genuine?
A: Check the insulator markings (sharp and clear on genuine plugs), the lot number on the hexagon, the gasket ring (securely attached), and the ground electrode shape. Counterfeit plugs often have blurred printing and incorrect lot numbers.
Q: What is the difference between NGK iridium and platinum spark plugs?
A: Iridium plugs last approximately 100,000 km, while platinum plugs last about 60,000 km. Iridium plugs cost 50% to 100% more but deliver better ignition efficiency and lower long-term cost per kilometer.
Q: What happens if I install the wrong heat range spark plug?
A: A plug that is too hot can cause pre-ignition and electrode erosion. A plug that is too cold can cause carbon fouling and misfire. Both conditions can lead to engine damage.
Q: Do you provide wholesale pricing for NGK spark plugs?
A: Yes. We supply distributors, repair shops, and fleet operators across the Middle East, Southeast Asia, and Latin America. Contact us with your target models and expected monthly volume for a wholesale price list.
Q: Which Toyota and Geely models do you cover?
A: Toyota coverage includes Camry, Corolla, RAV4, Vios, Yaris, Hilux, and Prado. Geely coverage includes Emgrand, Boyue, Coolray, and Monjaro. Other models are available on request.
