The 2021 Toyota Mirai has 9 electrical parts with verified fitment on this page — 3 part types and 7 brands, covering the ELECTRIC engine. Each part includes a manufacturer part number and application notes.
On the 2021 Toyota Mirai, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. All 9 listed parts are Battery (5 parts), Fuse (3 parts) and Battery Current Sensor (1 part).
Every part on this page is matched to the ELECTRIC — the only engine offered in the 2021 Toyota Mirai.
The most listed brands for 2021 Toyota Mirai electrical parts are BUSSMANN (3 parts), DEKA (1 part) and EXIDE (1 part), plus 4 more brands. Quality grades include AGM and Performance AGM.
1 part on this 2021 Toyota Mirai page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — DEKA 9A47 (Battery). Click any part number to see every vehicle that part fits.
Battery
AGM (Extended Life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA Popular | 9A47 | 🇺🇸 US 🇨🇦 CA | IntimidatorAGM | View on Amazon |
| EXIDE | MXH5L247 | 🇺🇸 US 🇨🇦 CA | Marathon MaxBCI Group 47 (H5) | View on Amazon |
| FVP | P47AGM | 🇺🇸 US 🇨🇦 CA | Platinum AGMBCI Group: 47 | View on Amazon |
| LUCAS | LBAGM001A | 🇺🇸 US 🇨🇦 CA | BCI Group: 47AGM | View on Amazon |
Performance AGM (Extended Life + Increased Power)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FULLRIVER | FT61047 | 🇺🇸 US 🇨🇦 CA | BCI Group 47(Length X Width X Height) 9.49 In x 6.89 In x 7.48 In | View on Amazon |
This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery.
5 Battery parts for the 2021 Toyota Mirai come from 5 brands — DEKA, EXIDE, FVP and 2 other brands. The "Popular" part is DEKA 9A47.
In the AGM (Extended Life) grade, DEKA, EXIDE, FVP and 1 other brand supply 4 parts: grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. A representative part number is DEKA 9A47.
In the Performance AGM (Extended Life + Increased Power) grade, FULLRIVER supplies 1 part: grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. A representative part number is FULLRIVER FT61047.
This group includes DEKA 9A47, EXIDE MXH5L247 and FVP P47AGM and the remaining parts above.
Battery Current Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | BSC164 | 🇺🇸 US 🇨🇦 CA | Intelligent Battery Sensor | View on Amazon |
This table covers the Battery Current sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
One part is listed for the 2021 Toyota Mirai — STANDARD MOTOR PRODUCTS BSC164.
Fuse
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BUSSMANN | MPF2534X | 🇺🇸 US 🇨🇦 CA | 50, 30, 40 Amp534 Amps | View on Amazon |
| BUSSMANN | MPF2555X | 🇺🇸 US 🇨🇦 CA | 50 AmpsColor Maroon | View on Amazon |
| BUSSMANN | MPF2444X | 🇺🇸 US 🇨🇦 CA | 40 / 40 / 40 Amp or 444 AmpsMPF multi-pole automotive fuses | View on Amazon |
This table covers the replacement fuses for this vehicle's fuse boxes. Typical signs include one circuit dead while its neighbor still works, or a fuse that blows again as soon as you replace it. Match amperage and fuse type. A repeat blow means a short — find it before the next fuse.
3 Fuse parts for the 2021 Toyota Mirai come from BUSSMANN.
Part numbers include BUSSMANN MPF2534X, BUSSMANN MPF2555X and BUSSMANN MPF2444X.
Buying Electrical Parts for a 2021 Toyota Mirai
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- Confirm you have the ELECTRIC engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Battery and Fuse .
Frequently Asked Questions
How many electrical parts fit the 2021 Toyota Mirai?
Our catalog currently lists 9 electrical parts for the 2021 Toyota Mirai across 3 subcategories and 7 brands, covering the ELECTRIC engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical problems on a 2021 Toyota Mirai?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Toyota Mirai was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Toyota Mirai?
Every part on this page is matched to the ELECTRIC engine. Then test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Toyota Mirai
Electrical Parts for Other Toyota Mirai Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.