Boost Pressure Sensor

This procedure covers the removal and replacement of the boost pressure sensor on the 2018-2024 Honda Accord 1.5L turbocharged engine, typically located on the intake manifold near the throttle body.

Warnings

Tools required

Parts

• Boost pressure sensor × 1 — OEM Honda 37830-5AA-A01 or equivalent
• O-ring seal (if not included with sensor) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely (at least 30 minutes after running)
3. Open hood and secure with prop rod
4. Disconnect negative battery terminal and wait 3 minutes to discharge electrical system
5. Remove engine cover by pulling upward on front clips and lifting off

Procedure

1. 1

   Locate the boost pressure sensor
   The boost pressure sensor is mounted on the intake manifold, typically on the passenger side near the throttle body. It is a small cylindrical sensor with a single electrical connector and is threaded into the manifold. Trace the intake system from the turbocharger to locate it visually.
2. 2

   Disconnect electrical connector
   Press down on the locking tab of the electrical connector and pull straight away from the sensor. If the connector is tight, gently wiggle it while pulling. Do not pull on the wiring harness itself. Move the connector aside to provide clearance for sensor removal.
3. 3

   Remove boost pressure sensor
   Using a 10mm socket, carefully unscrew the boost pressure sensor from the intake manifold in a counterclockwise direction. Remove the sensor completely and set aside. Inspect the sensor tip and O-ring for contamination or damage.
   Torque spec

   Boost Sensor15 Nm (11 lb-ft)
4. 4

   Inspect mounting port
   Examine the threaded port in the intake manifold for debris, carbon buildup, or thread damage. Use a clean shop towel to carefully wipe around the opening. Do not allow any debris to fall into the intake manifold. If the old O-ring remains in the port, carefully remove it with a pick.
5. 5

   Prepare new sensor
   Inspect the new boost pressure sensor and verify it matches the original part. Check that the O-ring is properly seated in the groove on the sensor threads. If installing a separate O-ring, apply a light coating of clean engine oil to the O-ring before installation to ensure proper sealing.
6. 6

   Install new boost pressure sensor
   Thread the new sensor into the intake manifold by hand, turning clockwise. Ensure it threads smoothly without resistance or cross-threading. Once hand-tight, use a torque wrench with 10mm socket to tighten to specification. Do not overtighten as this can damage the sensor or manifold threads.
   Torque spec

   Boost Sensor15 Nm (11 lb-ft)
7. 7

   Reconnect electrical connector
   Align the electrical connector with the sensor terminal and push firmly until you hear and feel a distinct click indicating the locking tab has engaged. Gently tug on the connector to verify it is securely locked in place.
8. 8

   Reinstall engine cover and reconnect battery
   Position the engine cover over the mounting posts and press down firmly on all clip locations until seated. Reconnect the negative battery terminal. Reset the clock and radio presets as needed.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify no tools or shop towels were left in the engine bay
3. Confirm engine cover is properly secured at all mounting points

Verification

• Start the engine and allow it to idle. Verify no boost pressure sensor fault codes appear on the dashboard
• Using an OBD-II scanner, check for diagnostic trouble codes related to boost pressure (P0236, P0237, P0238)
• Allow engine to reach operating temperature and monitor for proper operation without any check engine light
• Perform a brief test drive and verify normal acceleration and turbo operation with no hesitation or limp mode
• Check around the sensor installation point for any signs of air leaks (hissing sounds under acceleration)

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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