DEF System Parts Pricing
Current market data for 21,209 diesel exhaust fluid system components.
What you'll usually pay
💡 Buying used saves about 40% here.
👉 In short easy summary
The best value is found in Aftermarket Branded parts, which sit 58% below the market median. Genuine OEM parts maintain a higher price point, only 13% below the median.
💚 Best value for your money
Price by brand type
Why? Prices vary by origin, with Unbranded at 176.74 and Aftermarket Branded at 77.71.
Price by items included
Why? Component complexity drives cost, from Injectors at 66.65 to Pumps at 249.89.
Price by type
Why? Specialized electronics like Sensors cost 323.91, while Injectors are 79.6.
🛒 Some on sale right now
Common questions
What is the price difference between new and used DEF parts?
The median price for new parts is 178.64, while used parts have a median of 107.58.
Which specific DEF component is the most expensive on average?
Sensors have the highest median price at 323.91.
How much can I save by choosing Aftermarket Branded over the market median?
Aftermarket Branded parts have a median of 77.71, which is 58% below the market median.
How we got these numbers
Worked out from 200 live eBay listings (price range $24–$501, odd outliers ignored). These are asking prices, so use them as a guide. Last checked August 12, 2026.