2021 Mazda 3 engine computer — Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer price snapshot
- Low
- $30
- Average
- $114
- High
- $290
Year & trim-specific price guide
Used 2021 Mazda 3 Engine Computer — Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer prices
Trim-specific pricing for the Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer variant of the 2021 Mazda 3 engine computer, built from 46 real salvage yard listings with condition grade detail.
Price summary
A used 2021 Mazda 3 engine computer (Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer) costs $30 to $290, with a median asking price of $96. Based on 46 priced salvage yard listings across the US, updated Aug 29, 2026. Prices exclude shipping, core charges, and installation.
Grade A (excellent)$96
Grade B (good)$81
USD
Condition comparison
Price by part grade
Grade AClean / low wear$30–$29037 listings
Grade BStandard used$71–$1794 listings
Grade CVisible wearUpdating
Grade XUngraded$85–$1205 listings
| Grade | Price range | Relative range | Listings |
|---|---|---|---|
| Grade AClean / low wear | $30–$290 | 37 | |
| Grade BStandard used | $71–$179 | 4 | |
| Grade CVisible wear | Updating | — | |
| Grade XUngraded | $85–$120 | 5 |
Median by grade
Grade price comparison
Grade A$96
Grade B$81
Ungraded$100
Median asking price by seller-reported condition grade · $30–$290 overall range
Trim-specific context
How does the Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer compare?
This pricing covers the Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer variant of the 2021 Mazda 3 engine computer, based on 46 priced listings. Its $96 median is 0% above the 2021 Mazda 3 engine computer overall median of $96.
There are 2 other engine computer variants available for the 2021 Mazda 3.
Pricing is not a fitment guarantee. Match the VIN, part number, engine or drivetrain, and seller-listed variant before ordering.
Same trim, other years
Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer in other model years
Same year, other trims
What other 2021 Mazda 3 engine computer variants are available?
Back to full guide
2021 Mazda 3 engine computer — all trims
Common questions
2021 Mazda 3 engine computer (Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer) FAQ
How much is a used 2021 Mazda 3 engine computer (Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer)?
Based on 46 priced salvage-yard listings, a used 2021 Mazda 3 engine computer in the Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer variant lists between $30 and $290, with a median asking price of $96.
Which years use the Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer engine computer?
The Electronic Control Module, (mounted by battery), naturally aspirated, Denso manufacturer variant appears in model years 2021, 2023. Prices and availability may differ by year.