2018 Mazda 3 engine computer price snapshot
- Low
- $25
- Average
- $101
- High
- $465
Year-specific price guide
Used 2018 Mazda 3 Engine Computer prices
Year-specific used engine computer pricing for the 2018 Mazda 3, built from real salvage yard and junkyard listings with condition grade and fitment detail.
SKWritten bySaurabh Kumar · Co-Founder & CTO
SK
Saurabh Kumar
Co-Founder & CTO, Part Price Guide
Built the pricing pipeline that collects and normalizes used OEM part listings from salvage yards and online marketplaces across the US.
ASReviewed byAmbika Sharma · Co-Founder & COO
Last updatedAug 30, 2026AS
Ambika Sharma
Co-Founder & COO, Part Price Guide
12 years of project management and technical operations experience. Reviews price guides for sample size, fitment accuracy, and data freshness.
Part overview
About the 2018 Mazda 3 engine computer
A used 2018 Mazda 3 engine computer costs between $25 and $465, with a median of $86 from 487 salvage yard listings.
What the engine computer does, common failure signs, and prices across all vehicles: used engine computer price guide →
Also known asECUECMPCMEngine Control ModuleEngine Control UnitPowertrain Control Module
Price summary
A used 2018 Mazda 3 engine computer costs $25 to $465, with a median asking price of $86. Based on 487 priced salvage yard listings across the US, compatible across 2016–2018 (3 model years), updated Aug 30, 2026. Prices exclude shipping, core charges, and installation.
Grade A (excellent)$96
Grade B (good)$109
USD
Condition comparison
Price by part grade
Grade AClean / low wear$25–$394400 listings
Grade BStandard used$35–$46523 listings
Grade XUngraded$30–$15064 listings
| Grade | Price range | Relative range | Listings |
|---|---|---|---|
| Grade AClean / low wear | $25–$394 | 400 | |
| Grade BStandard used | $35–$465 | 23 | |
| Grade XUngraded | $30–$150 | 64 |
Median by grade
Grade price comparison
Grade A$96
Grade B$109
Ungraded$75
Median asking price by seller-reported condition grade · $25–$465 overall range
Replacement cost
What is the 2018 Mazda 3 engine computer replacement cost?
- Used part
- $86
- 2018 Mazda 3 median asking price
- Labor
- $95–$450
- 1–3 hours at $95–$150/hr
- Estimated total
- $180–$535
- median used part + labor
Labor is a typical independent-shop range for engine computer replacement, not a quote for your vehicle; it does not include programming and key relearn procedure. The part price is the live median from the salvage-yard listings on this page. Full engine computer replacement cost breakdown
Fitment matters
Price by trim & variant
Year-specific context
How does the 2018 Mazda 3 compare?
The 2018 guide is based on 568 observed listings, including 487 with posted prices. Its $86 median is 15% below the Mazda 3 guide's $101 median.
Among the 11 model years with current price data, 2018 ranks #1 from lowest to highest median.
Interchange data shows this part is also listed under model years 2016, 2017. Shopping across all 3 compatible years may surface better prices or condition grades.
Pricing is not a fitment guarantee. Match the VIN, part number, engine or drivetrain, and seller-listed variant before ordering.
Compare model years
What does a Mazda 3 engine computer cost in other years?
202592 listings$155$54 – $3542024100 listings$202$50 – $2962023145 listings$100$25 – $3312022150 listings$169$42 – $2552021145 listings$96$25 – $331202060 listings$170$49 – $255201949 listings$107$25 – $3312017638 listingsCompatible$101$25 – $460201650 listingsCompatible$150$80 – $4652015317 listings$99$30 – $395
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Common questions
2018 Mazda 3 engine computer FAQ
How much is a used 2018 Mazda 3 engine computer?
Based on 487 priced salvage-yard listings, a used 2018 Mazda 3 engine computer lists between $25 and $465, with a median asking price of $86.
How much does it cost to replace a 2018 Mazda 3 engine computer?
Using a used part, a 2018 Mazda 3 engine computer replacement typically runs $180–$535 all-in: the median used engine computer for this year lists at $86, and independent-shop labor for engine computer replacement typically takes 1–3 hours at $95–$150/hr ($95–$450). The labor figure does not include programming and key relearn procedure. Labor is a national part-level estimate, not a quote for your vehicle.
Will a 2018 Mazda 3 engine computer fit another year?
Based on salvage-yard interchange data, listings for the 2018 Mazda 3 engine computer also appear under model years 2016, 2017, suggesting these years share compatible fitments. Always verify the exact part number, drivetrain, trim, and your VIN before buying — interchange compatibility can vary by variant.
How much is a 2018 Mazda 3 ecu?
A ecu is another name for a engine computer. The prices on this page cover the 2018 Mazda 3 engine computer — median $86, from 487 listings.