Throttle Body

This procedure covers the removal and replacement of the throttle body on a 2018-2024 Honda Accord with the 1.5L turbocharged engine, including disconnection of electrical connectors and air intake components.

Warnings

Tools required

Parts

• Throttle body gasket × 1 — Use OEM specification
• Throttle body assembly × 1 — Use OEM specification (if replacing)

Preparation

1. Ensure engine is completely cold
2. Park vehicle on level surface and engage parking brake
3. Disconnect negative battery terminal and wait 3 minutes for system discharge
4. Remove engine cover by pulling upward on integrated pull points

Procedure

1. 1

   Remove air intake system
   Loosen the air intake hose clamp at the throttle body inlet using a flathead screwdriver. Disconnect the breather hose from the air intake tube. Remove the air intake tube by pulling it away from the throttle body.
   Torque spec

   Air Intake Hose Clamps3 Nm (2 lb-ft)
2. 2

   Disconnect throttle body electrical connector
   Locate the electrical connector on the left side of the throttle body. Press the release tab and carefully pull the connector straight off the throttle body. Move the wiring harness aside to provide clearance.
   ⚠Do not pull on wires; always grasp the connector body to prevent damage
3. 3

   Remove throttle body mounting bolts
   Using a 10mm socket, remove the four throttle body mounting bolts in a crisscross pattern. Keep bolts organized for reinstallation. Note the bolt locations as they may be different lengths.
   Torque spec

   Throttle Body Bolts10 Nm (7 lb-ft)
4. 4

   Remove throttle body assembly
   Carefully pull the throttle body straight out from the intake manifold. The gasket may stick to either the throttle body or manifold surface. Remove and discard the old gasket completely.
   ⚠Support the throttle body to prevent it from falling and damaging the throttle plate
5. 5

   Clean mating surfaces
   Using shop towels, thoroughly clean the intake manifold mating surface, removing all gasket material and debris. Ensure no debris falls into the intake manifold opening. Inspect the throttle body bore and plate; clean with throttle body cleaner if servicing (not replacing).
   ⚠Cover intake manifold opening with a clean shop towel to prevent foreign objects from entering
6. 6

   Install new gasket
   Position the new throttle body gasket on the intake manifold. Ensure all bolt holes and passages align correctly. The gasket should sit flat without gaps or wrinkles.
7. 7

   Install throttle body
   Carefully align the throttle body to the intake manifold, ensuring the gasket remains properly positioned. Insert all four mounting bolts by hand to ensure proper thread engagement before tightening any bolts.
8. 8

   Torque throttle body bolts
   Using a torque wrench, tighten the throttle body mounting bolts in a crisscross pattern to 14.0 Nm (10 lb-ft). This is a critical torque specification to ensure proper sealing and prevent vacuum leaks.
   ⚠Over-torquing can warp the throttle body housing; under-torquing can cause vacuum leaks
   Torque spec

   Throttle Body Bolts10 Nm (7 lb-ft)
9. 9

   Reconnect electrical connector
   Push the throttle body electrical connector firmly onto the throttle body until it clicks into place. Verify the connector is fully seated and the locking tab is engaged.
10. 10

    Reinstall air intake system
    Connect the air intake tube to the throttle body inlet, ensuring it is fully seated. Reconnect the breather hose to the air intake tube. Tighten the intake hose clamp to 4.0 Nm (3 lb-ft) using a torque wrench or screwdriver.
    Torque spec

    Air Intake Hose Clamps3 Nm (2 lb-ft)
11. 11

    Reinstall engine cover and battery
    Reinstall the engine cover by aligning the mounting grommets and pressing down firmly until seated. Reconnect the negative battery terminal.

Reassembly

1. Verify all electrical connectors are fully seated with locking tabs engaged
2. Ensure all hose clamps are properly tightened to prevent air leaks
3. Double-check that no tools or shop towels were left in the engine bay

Verification

• Start the engine and verify smooth idle operation with no rough running or stalling
• Check for unusual hissing sounds indicating vacuum leaks around the throttle body
• Verify no check engine light illumination after 2-3 drive cycles
• Confirm throttle response is smooth and immediate with no hesitation
• Allow ECU to relearn idle parameters over 10-15 minutes of varied driving conditions

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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