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EFI Main Relay

Critical For Operation

Fuel System

Controls the power supply to the electronic fuel injection system.

The EFI main relay provides power to the electronic fuel injection system, ensuring the proper operation of fuel injectors and fuel pump when the vehicle is running.

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Typical part cost
$20–$60🔒
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Typical labor cost
$50–$150🔒
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Typically lasts
100,000–200,000 mi
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Or about
7.0–10.0 years
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DIY difficulty
3/10

⚠️ Owners Often Notice

If the EFI Main Relay is starting to fail, these are the signs owners most commonly report before it gets worse:

Engine won't start
Poor engine performance
Loss of power
Hard starting
Check engine light
Poor fuel economy

Related Services

Services commonly performed on or around this part.

Replace EFI Main Relay

No standard interval on file

Inspect EFI Main Relay

No standard interval on file

Test EFI Main Relay

No standard interval on file