Mazda 3 engine computer price snapshot
- Low
- $25
- Average
- $127
- High
- $465
Vehicle-specific price guide
How much is a used Mazda 3 engine computer?
Asking prices from 559 salvage yards in 47 states, broken down by model year, condition grade, and fitment variant.
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 updatedOct 22, 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 Mazda 3 engine computer
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 Mazda 3 engine computer costs $25 to $465, with a median asking price of $101. Based on 1,926 priced salvage yard listings across the US, compatible across 2014–2025 (12 model years), updated Oct 22, 2026. Prices exclude shipping, core charges, and installation.
Grade A (excellent)$104
Grade B (good)$110
Grade C (fair)$100
USD
Condition comparison
Price by part grade
Grade AClean / low wear$25–$4651,588 listings
Grade BStandard used$30–$465155 listings
Grade CVisible wear$99–$1257 listings
Grade XUngraded$30–$208176 listings
| Grade | Price range | Relative range | Listings |
|---|---|---|---|
| Grade AClean / low wear | $25–$465 | 1,588 | |
| Grade BStandard used | $30–$465 | 155 | |
| Grade CVisible wear | $99–$125 | 7 | |
| Grade XUngraded | $30–$208 | 176 |
Median by grade
Grade price comparison
Grade A$104
Grade B$110
Grade C$100
Ungraded$79
Median asking price by seller-reported condition grade · $25–$465 overall range
Regional supply
Where the Mazda 3 engine computer is listed
We found priced Mazda 3 engine computer listings at 559 salvage yards across 47 states. California supplies the most, with 512 listings (21% of the total) from 53 yards. Location matters: yards in California ask a median $75, while Michigan yards ask $190, 153% more for the same part. Shipping usually costs less than that gap for smaller parts, so it can pay to buy out of state.
| State | Listings | Yards | Median ask |
|---|---|---|---|
| California | 512 | 53 | $75-26% |
| Texas | 442 | 59 | $95-6% |
| Illinois | 134 | 21 | $165+63% |
| Ohio | 99 | 22 | $125+24% |
| Michigan | 83 | 28 | $190+88% |
| Wisconsin | 78 | 13 | $159+57% |
| Florida | 72 | 28 | $101 |
| Indiana | 72 | 15 | $99-2% |
States with at least 10 priced listings. % is versus the $101 national median.
Replacement cost
What is the Mazda 3 engine computer replacement cost?
- Used part
- $101
- Mazda 3 median asking price
- Labor
- $95–$450
- 1–3 hours at $95–$150/hr
- Estimated total
- $195–$550
- 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
Sources
- Labor time estimates: Part Price Guide labor database
Model-year comparison
What does a Mazda 3 engine computer cost by year?
202592 listings$155$54 – $3542024100 listings$202$50 – $2962023145 listingsFits 6 years$100$25 – $3312022150 listingsFits 5 years$169$42 – $2552021145 listingsFits 6 years$96$25 – $331202060 listingsFits 5 years$170$49 – $255201949 listingsFits 5 years$107$25 – $3312018568 listingsFits 3 years$86$25 – $4652017638 listingsFits 5 years$101$25 – $460201650 listingsFits 3 years$150$80 – $4652015317 listingsFits 4 years$99$30 – $395
Market analysis
How much does a used Mazda 3 engine computer cost?
Asking prices for a used Mazda 3 engine computer are unusually spread out: the top listing asks more than ten times what the cheapest does, so which unit you pick matters more than the median. Condition matters: grade-A units (lowest mileage, best condition) carry roughly a 4% premium over grade-C stock, with grade-A medians at $104.
Model year matters too: 2018 units carry the lowest median at $86, while 2024 tops the table at $202. Parts from 2016–2018 are interchangeable, so if the 2018 fits your vehicle, it offers the best value across 3 compatible years.
Against comparable vehicles, the Mazda 3 sits 10% below the Honda Accord ($112), 9% below the Honda Civic ($111), and 20% below the Hyundai Elantra ($126) for the same part. The “similar vehicles” cards below open each comparison guide.
Buying a used engine computer: what to check
- Match hardware and service numbers: Ensure hardware revision codes and circuit board part numbers match exactly, as pinouts change mid-model year.
- Inspect multi-pin connector headers: Check header pins for bending, green copper oxidation, or burnt circuit board traces inside the wiring sockets.
- Verify immobilizer programming requirements: Plan for anti-theft security relearn procedures or ECU re-flashing before the replacement computer will start the engine.
- Confirm donor transmission and emissions spec: Ensure the donor vehicle used the same transmission type and regional emissions package to prevent fault codes.
- Check aluminum casing seals: Inspect housing screws and perimeter rubber gaskets for white oxidation or breaks that indicate past water intrusion.
Keep browsing this vehicle
What other Mazda 3 parts are priced?
01wide ±202%
Tail Light
$195median
$34$821
02wide ±206%
Axle Shaft
$96median
$28$424
03wide ±179%
Side Mirror
$157median
$30$593
04wide ±225%
Wheels
$178median
$30$830
05wide ±253%
Transmission
$560median
$116$2,947
06wide ±115%
Headlight Assembly
$950median
$147$2,325
07wide ±235%
Grille
$184median
$29$895
08wide ±110%
Fender
$198median
$65$500
09wide ±207%
Engine
$1,072median
$204$4,650
10wide ±181%
Alternator
$85median
$25$332
11wide ±162%
Strut
$100median
$30$354
12wide ±254%
Starter
$71median
$25$385
Price comparisons
Compare Mazda 3 engine computer prices
Engine Computercompare
HondaAccordvsMazda3
Accord$112
3$101
$11 diff10,131 listings
Engine ComputercompareHondaCivicvsMazda3
Civic$111
3$101
$10 diff9,966 listings
Engine ComputercompareHyundaiElantravsMazda3
Elantra$126
3$101
$25 diff9,522 listings
Engine ComputercompareFordF250vsMazda3
F250$250
3$101
$149 diff6,091 listings
Engine ComputercompareKiaSportagevsMazda3
Sportage$159
3$101
$58 diff5,880 listings
Engine ComputercompareFordMustangvsMazda3
Mustang$172
3$101
$71 diff5,760 listings
Compare fitments
What do similar vehicles charge for this part?
Acurawide ±167%
Acura ILX
$138median
$40$500
Acurawide ±153%
Acura Integra
$155median
$50$525
Acurawide ±219%
Acura MDX
$135median
$35$625
Acurawide ±162%
Acura RDX
$155median
$42$543
Acurawide ±208%
Acura TLX
$125median
$33$553
Audiwide ±174%
Audi A4
$175median
$35$644
Audiwide ±122%
Audi A6
$184median
$50$500
Audiwide ±188%
Audi Q3
$200median
$50$800
Audiwide ±211%
Audi Q5
$192median
$39$850
Audiwide ±141%
Audi Q7
$249median
$48$748
Mazdawide ±235%
Mazda CX5
$110median
$25$543
Mazdawide ±205%
Mazda Miata
$165median
$30$705
Common questions
Mazda 3 engine computer FAQ
How much is a used engine computer for a Mazda 3?
The median asking price is $101 across 1,926 priced listings from 559 yards. Grade-A units, the cleanest stock, have a median of $104. 2018 is the cheapest model year we track, with a median of $86.
How much does it cost to replace a Mazda 3 engine computer?
Using a used part, a Mazda 3 engine computer replacement typically runs $195–$550 all-in: the median used engine computer for this model lists at $101, 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.
Which Mazda 3 model years does this price guide cover?
This guide currently has year-level pricing for 2025, 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015. Other model years contribute to the overall range where sellers listed them without a year breakdown.
Which Mazda 3 engine computer years are interchangeable?
Salvage-yard interchange data links Mazda 3 engine computer fitments across 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025. Searching all 12 years widens the pool of units; confirm the part number against your VIN, since trim or drivetrain can split an interchange group.