knfilters.com
16 offers to explore · Updated
SAVE ON YOUR NEXT ORDER
Common K&N Filters codes from the offers we've collected, shared for reference only. A code isn't guaranteed to work, so check the offer's terms at checkout.
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Past promotions for reference. These offers may no longer be redeemable.
OCT| Code | Discount | Offer | Expires |
|---|---|---|---|
| 10OFFKNXT | 10% OFF | Save 10% on Your Order | Nov 26, 2026 |
| HOLIDAY10 | 10% OFF | Save 10% on Your Order | Nov 30, 2026 |
| FREETOTE | Up to 30% OFF | Save up to 30% on All Orders | Nov 19, 2026 |
| MADRED | Up to 40% OFF | Save up to 40% at K&N | Nov 19, 2026 |
| Home25 | 25% OFF | Galore: Take 25% off Your Order in Your Cart | Nov 15, 2026 |
K&N Filters is an automotive filtration company that made its name on high-flow, reusable air filters and intake systems, and it has been trading since 1969. K&N Engineering, Inc. is headquartered in Riverside, in the United States. The catalog runs to over 12,000 products, spanning air filters, cabin filters, oil filters and performance air intake systems for automobiles, motorcycles and industrial applications.
The cotton gauze filter technology the company pioneered catches contaminants while allowing the element to be cleaned and reused instead of discarded. K&N builds its products around engine performance as well as engine protection, presenting them as a way to extend the working life of vehicles and machinery. Alongside the filters themselves, the company sells the cleaning and recharge supplies needed to service reusable elements.
Payments can be made with PayPal, Apple Pay, a debit card or Afterpay. K&N maintains accounts on Facebook, Twitter, YouTube, Instagram, Pinterest, LinkedIn and TikTok. Its website, knfilters.com, carries product specifications, a dealer locator and maintenance information, and orders for some offers are taken by phone.
Confirm current details directly with the merchant.
Codes go into the discount code box at the K&N Filters checkout; deals need no code.
Pick a code from the list above. Its details give the discount and any conditions, such as a minimum spend or an end date.
Select Show Code. A window opens with the full code, a Copy code button and a link to knfilters.com.
Add your items at knfilters.com, then paste the code into the discount code box in your basket or at checkout.
Make sure the discount shows in the order total before you pay. If it does not, the order may not meet one of the code's conditions.
Yes, K&N Filters gives a military and veterans discount. Orders have to be placed directly over the phone by calling 1-800-858-3333, and the caller should mention military or veteran status.
Yes, K&N Filters gives new users a first order discount. It generally comes through email signup or account creation promotions.
Yes, K&N Filters ships orders over $75 for free. That normally applies to qualifying orders placed within the UK.
Yes, K&N Filters gives new customers a 10% signup discount when they join the email newsletter. After entering an email address on the website, customers get an instant discount code that works on select items. Subscribers also receive exclusive offers, product updates and helpful tips from K&N Filters.
Yes, K&N Filters runs clearance deals on select products, with savings of up to 40%. Air filters, intakes, cabin air filters, oil filters, cleaning products, wiper blades and accessories are all covered. The limited-time offers sit on the website's dedicated clearance page while supplies last.
On this page, 1 offer is for new customers only. A code also fails when the basket has excluded items or the promotion has ended.
MADRED gives the biggest discount on this page, up to 40% off. The biggest deal, up to 45% off, needs no code.
No offer on this page is marked sitewide. Each offer's details give the products it covers.
No offer on this page states a use limit.
Yes. K&N Filters provides loyalty-style perks, including member discounts of up to 20% off and free account signup on its UK site. Exclusive offers and free shipping over 25 GBP are part of the arrangement, though there is no traditional points-based program.
K&N Filters accepts PayPal, Apple Pay, Debit card and Afterpay.
K&N Filters has official accounts on Facebook, Twitter, YouTube, Instagram, Pinterest and 2 more.
Over the past year, 3 K&N Filters codes were collected, fewer than one a month. The busiest month was November 2026, with 1 code. The most popular discount was 50% off, offered in December 2025.