Ignitions and Electrical› Computers, Chips, Modules and Programmers

Mazda

Engine Control Module

$249.99

SKU: L374-18-881C

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

Easy — 1–2 hours

Overview

The Mazda L374-18-881C is an engine control module (ECM), also known as an Engine Control Unit (ECU) or Powertrain Control Module (PCM). It is a guaranteed replacement for 2004 Mazda 3 PCM models with a 2.3L engine and the matching part number L374-18-881C.

This ECM arrives programmed, flashed, and updated to your vehicle's VIN with the latest manufacturer updates, which aim to improve performance and fuel economy. If your vehicle is equipped with PATS (Passive Antitheft System), key reprogramming by a locksmith or dealer may be necessary. Otherwise, the unit is plug-and-play.
Show original supplier description
The Mazda L374-18-881C is a guaranteed replacement Engine Control Module (ECM), also referred to as an Engine Control Unit (ECU) or Powertrain Control Module (PCM), specifically for 2004 Mazda 3 models equipped with a 2.3L engine and matching part number L374-18-881C. This unit comes programmed, flashed, and updated to your vehicle's VIN with the most recent manufacturer updates. The installation process is plug-and-play for vehicles not equipped with the PATS (Passive Antitheft System). For vehicles with PATS, key reprogramming by a Locksmith or Ford Dealer may be required. Each ECM is individually inspected, fully refurbished, and quality control tested by certified in-house mechanics. This rigorous in-house testing ensures that the unit addresses common issues such as electrical problems, failure to start, fault/trouble codes, intermittent issues, loss of power, no ignition or injector pulse, poor fuel economy, and shifting problems. FS1 Inc. offers this ECM with a lifetime warranty, free shipping throughout the USA, and no core charge, allowing you to keep your old unit.

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

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandMazda
Part NumberL374-18-881C
CategoryIgnitions and Electrical

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

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.

View Full Return Policy

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.

View Full Shipping Policy