Can the Iridium Power gap be adjusted? Can I use any spark plug cleaners with Iridium Power?

Do not adjust the spark plug gap. Use of a spark plug cleaner for short periods is acceptable if low pressure is used. Iridium Power spark plug gap is already set at the optimum distance. If the electrode is damaged by gap adjustment or cleaning, the spark plugs will not perform to their best.

Last Updated: January 14, 2017
Do you offer refills for your wiper blades?

We only offer the entire wiper blade. 

Last Updated: January 23, 2019
Does the engine need to be specially set when fitting Iridium Power?

No. The plugs can just replace the ones you take out. The Iridium Power spark plug itself has a low required voltage and high ignitability and is able to draw out the power of an engine. The superb performance of Iridium Power spark plugs is obtained merely by installing them in your vehicle. And, of course, there is no need for special tuning.

Last Updated: January 14, 2017
How difficult is it to replace TPMS sensors?

Because of their location inside your tire, there is simply no way to access and replace a TPMS sensor without the use of special equipment to remove, re-install and re-balance the tire. For this reason, we recommend you have a professional replace your sensors.

Last Updated: March 16, 2018
How do I select the correct heat range when fitting Iridium Power to my vehicle?

In ordinary cars, use a spark plug with the same heat range as a normal spark plug. In highly tuned vehicles, select a heat range to suit the tuning level of the engine. (Ordinarily, the heat range of a highly tuned engine tends to be colder.)

Refer to the following table to compare the heat range of the Iridium Power and other spark plugs.

Last Updated: January 14, 2017
What causes TPMS sensors to fail?

The most common cause of TPMS sensor failure is battery exhaustion. TPMS sensors have built-in batteries with a limited lifespan. When the battery fails, the entire sensor must be replaced.

Last Updated: March 16, 2018
What design features make the Iridium Long Life stand out from competitors?

DENSO's ultimate long life spark plug comes factory installed on the latest high performance and luxury vehicles by automakers such as Toyota, Lexus, GM, Cadillac, Honda, Acura, and Mitsubishi. Using its patented Iridium alloy and patented 360° laser welding process, DENSO was able to shrink the center electrode to 0.7mm, dramatically improving ignitability and achieving the ultimate longevity -- longer than any other OE plug available.

Last Updated: January 14, 2017
What design features make the Iridium Power stand out from competitors?

Iridium is 6x harder and 8x stronger than platinum, this allows DENSO engineers to shrink the center electrode tip to only 0.4mm, the world's smallest , and still maintain durability. This tiny electrode reduces the required voltage for the plug to fire resulting in improved firing performance. DENSO uses a patented Iridium alloy formula which employs over 90% Iridium, and small amounts of another material called Rhodium, which is added to even further reduce oxidation.

Also, a U-Groove has been cut inside the ground electrode to maintain the large volume of space required to form the nucleus of a flame. While still keeping the required voltage low, this technology enables excellent firing performance without increasing the spark gap.

The tip of the ground electrode has been cut to form a taper. This greatly improves firing performance by reducing "quenching," or the absorption of spark energy by the electrode.

At first, the use of Iridium as an electrode material was impossible due to its extreme hardness and high melting point. Now, DENSO has developed a patented 360° laser welding process to firmly affix the Iridium material to the center electrode in a bond so reliable the electrode resists wear even in the harshest conditions.

Last Updated: January 14, 2017
What design features make the Iridium Racing stand out from competitors?

DENSO's patented Iridium alloy, with an extremely high melting point, is used to create the world's smallest center electrode, thus allowing the voltage requirements to be significantly reduced, and greatly improving ignition performance. DENSO's Iridium alloy achieves its particular characteristics through a unique material structure and production method which bonds the alloy in the most reliable patented process.

DENSO's patented 360° laser welding process to permanently affix the Iridium center electrode tip creates a bond so reliable the electrode resists wear even in the harshest racing conditions.

Platinum has a higher melting point than the nickel alloys used in conventional spark plug ground electrodes. DENSO's 100% Platinum ground electrode reduces wear and problems such as melting the ground electrode under severe race conditions. In addition, the platinum alloy used in the 0.8mm ground electrode is produced without the need for fusing or bending, which increases durability and virtually eliminates residual stress.

A small gap has been developed around the tip of the center electrode and insulator. If the plug develops carbon build up and bridging occurs, electrical discharges in this section burn away any carbon deposits and clean the insulator. This technology has been patented by DENSO (Japanese patent No. 2727558)

For racing vehicles, starting problems caused by carbon deposits and bridged plugs before the start of a race can be fatal. To prevent this, a film of silicone oil is applied to the insulator. The water-repellent properties of the silicone oil keep the insulator surface free from moisture and carbon to prevent any losses in plug insulating performance.

A bevel on the side of the housing has been increased in size to improve resistance to abnormal combustion. Furthermore, they also make possible the discharge of residual gases and entry of fresh gases; improve self-cleaning performance, which helps reduce plug fouling.

Through DENSO's involvement in motorsports, we have engineered a new insulator that is 20% stronger than insulators previously used, achieving unsurpassed reliability.

Last Updated: January 14, 2017
What does it mean when my TPMS indicator illuminates?

When the TPMS light comes on and stays on, it means that at least one of your tires is at a low pressure level. If the light flashes for approximately 60 to 90 seconds when you start your car and remains illuminated, it means that your TPMS system isn't functioning properly and you should take your vehicle to a service center for an inspection.

Last Updated: March 16, 2018
What features make the Platinum TT a superior spark plug?

DENSO's revolutionary Twin-Tip design uses the latest OE technology in combination with Platinum and Titanium, two highly durable precious metals. The center electrode is created using an extremely durable Platinum alloy that allows for the reduction of the tip size to 1.1mm in diameter, to increase performance, while still maintaining plug life. The Titanium-enhanced alloy on the ground electrode further increases durability, which is critical to minimize tip erosion and allow the high-performing Twin-Tip design to function over the long-term. These design features combine to offer better performance through reduced quenching which results in a larger spark and faster flame propagation for a more complete combustion and maximized fuel efficiency.

Last Updated: January 14, 2017
What is TPMS (Tire Pressure Monitoring System)?

TPMS warns you of unsafe changes in air pressure in one or more of your vehicle's tires. Readings from pressure sensing transmitters mounted inside each tire send information to a central computer for display on your dashboard.

Last Updated: March 16, 2018
What makes the Platinum TT stand out above the competition?

Superior ignitability of the DENSO Platinum TT means more efficient combustion, which yields better engine performance in terms of power and fuel economy. Better mileage, more power and faster starts, all while reducing carbon emissions are what places the Platinum TT Spark Plug heads above the competition.

Last Updated: January 14, 2017
What's the difference between Iridium Power and Iridium Long Life?

Iridium Power is a high performance spark plug. The Iridium Long Life is the genuine part that comes OE from car manufacturers. Please click here for more information.

Last Updated: January 14, 2017
Why should I insist on DENSO First Time Fit® TPMS sensors?

DENSO First TI me Fit® TPMS sensors provide accurate tire pressure and temperature readings for safer, more fuel-efficient driving in all conditions. Unlike one-size-fits-all sensors, they're designed specifically for your vehicle and restore it to its original condition. Plus, they're backed by a 12-month warranty.

Last Updated: March 16, 2018
Why should I use the Iridium Long Life?

With a lifespan over 3x longer than conventional spark plugs, the Iridium Long Life is the perfect OE replacement for today's modern vehicles. For longer life and improved performance, this DENSO outlasts all others.

Last Updated: January 14, 2017
Why should I use the Iridium Power®?

Our customers choose the DENSO Iridium Power spark plug for its unsurpassed performance, increasing overall power and acceleration. For that extra burst of power when you need it most, you can count on the combination of revolutionary Iridium alloy and laser welding technology which allows DENSO to harness the power of Iridium to dramatically increase firing performance. The result is maximum horsepower and torque. From extreme race conditions to the daily driver, the Iridium Power is the ultimate choice for performance.

Last Updated: January 14, 2017
Why should I use the Iridium Racing®?

Just as the name suggests, the DENSO Iridium Racing spark plug is the premier choice for racing vehicles. For durability under the harshest, hottest conditions, preventative and self-cleaning technology, lower voltage requirements and the highest performance possible, you won't go wrong with an Iridium Racing because there is nothing better.

Last Updated: January 14, 2017
Why should I use the Platinum TT®?

Our customers choose the Platinum TT to achieve better fuel economy, durability and reduce their carbon emissions. They also appreciate the durability of the Platinum TT, resulting in a longer lifespan coupled with enhanced performance.

Last Updated: January 14, 2017

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