This procedure covers the removal and replacement of a single fuel injector on the 2018-2024 Toyota Camry 2.5L I4 engine, including fuel system depressurization and fuel rail removal.

Warnings

Tools required

Parts

• Fuel injector × 1 — Use OEM specification - Toyota 23250-36010 or equivalent
• Fuel injector O-ring kit × 1 — Use OEM specification
• Fuel rail insulator grommets × 1 — Use OEM specification - replace if damaged

Preparation

1. Ensure engine is cool to touch
2. Disconnect negative battery terminal and wait 90 seconds for airbag system to discharge
3. Place fuel-safe catch pan and shop towels under work area
4. Relieve fuel system pressure by removing fuel pump relay (EFI1 relay in engine compartment fuse box) and cranking engine until it stalls
5. Remove engine cover by pulling upward on the four corner mount points

Procedure

1. 1

   Access fuel rail area
   Disconnect the air intake duct from the throttle body by loosening the clamp. Move the intake duct aside for better access to the fuel rail. Disconnect any vacuum lines or wiring harnesses that may interfere with fuel rail removal.
2. 2

   Disconnect fuel supply line
   Locate the fuel supply line connection on the fuel rail. Use the appropriate fuel line disconnect tool to press the release tabs and disconnect the quick-connect fitting. Have shop towels ready to catch residual fuel. Cap or plug the line to prevent contamination.
   ⚠Residual fuel under pressure may spray out. Keep face and eyes away from connection point.
3. 3

   Disconnect fuel injector electrical connectors
   Press the locking tab on each fuel injector electrical connector and disconnect all four injectors. Push the wire harness aside to provide clearance for fuel rail removal. Note the routing for reassembly.
4. 4

   Remove fuel rail mounting bolts
   Remove the two 12mm fuel rail mounting bolts located at each end of the fuel rail. Keep these bolts as they will be reused during reinstallation.
   Torque spec

   Fuel Rail Bolts12 Nm (9 lb-ft)
5. 5

   Remove fuel rail assembly
   Carefully pull the fuel rail assembly straight up and away from the intake manifold. The injectors will come out with the rail. You may need to gently rock the rail side-to-side while pulling upward to break the O-ring seal. Place the fuel rail assembly on a clean work surface with the injectors facing upward.
6. 6

   Remove defective fuel injector
   Locate the injector clip on the faulty injector. Use a small flat blade screwdriver to pry open the clip tabs while pulling the injector out of the fuel rail. The injector should slide out once the clip is released. Note the orientation of the injector and clip for installation.
7. 7

   Remove old O-rings and inspect seats
   Remove both O-rings from the old injector (upper rail seal and lower intake manifold seal). Inspect the fuel rail bore and intake manifold injector seat for damage, debris, or scoring. Clean any residue with a lint-free cloth. Check the insulator grommet in the intake manifold and replace if damaged or hardened.
8. 8

   Install new O-rings on replacement injector
   Lubricate the new O-rings lightly with clean gasoline or light machine oil. Install the new upper O-ring into the groove near the top of the injector body. Install the new lower O-ring into the groove near the injector tip. Ensure both O-rings are seated properly in their grooves without twisting.
   ℹ️Never reuse old O-rings. Always use new O-rings with proper lubrication to prevent damage during installation.
9. 9

   Install new injector into fuel rail
   Align the new injector with the correct orientation (electrical connector should match position of other injectors). Push the injector into the fuel rail bore until fully seated. Install the injector retaining clip by pressing it into place until you hear or feel it snap. Verify the clip is fully engaged on both sides.
10. 10

    Reinstall fuel rail assembly
    Ensure all four injector insulator grommets are properly seated in the intake manifold. Carefully align all four injectors with their respective bores. Press the fuel rail assembly straight down with even pressure until all injectors are fully seated in the manifold. The rail should sit flush on the mounting bosses.
    ⚠Apply even downward pressure to avoid cocking injectors at an angle which can damage O-rings.
11. 11

    Install fuel rail mounting bolts
    Install both fuel rail mounting bolts hand-tight first to ensure proper alignment. Torque the bolts to specification in a crossing pattern to ensure even seating of all injectors.
    Torque spec

    Fuel Rail Bolts12 Nm (9 lb-ft)
12. 12

    Reconnect fuel injector connectors
    Reconnect all four fuel injector electrical connectors ensuring each connector clicks into place and the locking tab engages. Route the wire harness as noted during disassembly.
13. 13

    Reconnect fuel supply line
    Inspect the fuel line quick-connect fitting for damage or debris. Push the fuel line onto the fuel rail connection until you hear and feel a positive click. Pull back on the line to verify it is locked in place.
14. 14

    Reinstall air intake components
    Reinstall the air intake duct to the throttle body and tighten the clamp securely. Reconnect any vacuum lines or harnesses that were moved aside. Reinstall the engine cover by pressing down on all four corner mount points until they snap into place.
15. 15

    Prime fuel system and check for leaks
    Reinstall the fuel pump relay (EFI1). Reconnect the negative battery terminal. Turn the ignition to ON position (without starting) for 2-3 seconds, then OFF. Repeat this cycle 3-4 times to prime the fuel system. Inspect all fuel connections for leaks. Start the engine and verify no fuel leaks are present while engine is running.
    ⚠️If any fuel leaks are detected, immediately turn off engine and relieve fuel pressure before correcting the issue.

Reassembly

1. Ensure all fuel injector electrical connectors are fully seated with locking tabs engaged
2. Verify fuel supply line quick-connect is properly locked in place
3. Confirm engine cover is securely snapped onto all mounting points

Verification

• Start engine and allow it to idle. Listen for smooth idle with no misfires or rough running
• Visually inspect fuel rail and all connections for fuel leaks with engine running
• Use scan tool to check for any fuel system related diagnostic trouble codes
• Test drive vehicle to verify normal acceleration and performance with no hesitation or stumbling
• Recheck for fuel leaks after test drive with engine at operating temperature

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