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Air and Fuel› Intake Manifolds and Components

Holley

Replacement Air Temperature Sensor

$31.99 $28.79 Save $3.20

SKU: HOL554-121

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Overview

The Holley 554-121 is a replacement air temperature sensor designed for use with Holley Terminator EFI systems. It provides accurate air temperature measurement for precise engine performance. This sensor features a black housing and a push-in mounting type.
Show original supplier description
The Holley 554-121 Terminator EFI Air Temperature Sensor is a direct replacement part designed to ensure accurate measurement of incoming air temperature for optimal engine performance. This sensor is specifically built to work with Holley Terminator EFI systems, providing reliable data for engine management. Constructed with a durable black housing, this air temperature sensor utilizes a push-in mounting type for straightforward installation. It features a female connector and one terminal, facilitating a secure connection. The sensor's performance grade ensures it meets the demands of performance applications. It is important to note that mounting hardware and wiring harnesses are not included with this sensor. This air charge temperature sensor is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations. The product also comes with a California Proposition 65 warning.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandHolley
Part NumberHOL554-121
CategoryAir and Fuel

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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