engine
Manifold Absolute Pressure Sensor
for 2021 Honda Civic 1.5L I4 Turbo · FWD
Difficulty
Easy
Time
30 min
Tools
4
Steps
10
Replace the Manifold Absolute Pressure (MAP) sensor on the 1.5L turbo engine to restore proper boost pressure monitoring and engine performance.
Warnings
⚠Allow engine to cool completely before beginning work to avoid burns from hot intake components
ℹ️Disconnecting battery will erase radio presets and may require power window initialization after repair
Tools required
10mm socket and ratchetEssential
Small flathead screwdriver or trim tool
Torque wrench (1-10 Nm range)Essential
Dielectric grease
Parts
- Manifold Absolute Pressure (MAP) Sensor × 1 — 37830-5AA-A01 or equivalent OEM
Preparation
- Park vehicle on level surface and ensure engine is completely cool
- Open hood and secure with prop rod
- Disconnect negative battery terminal and wait 3 minutes to allow system capacitors to discharge
- Locate MAP sensor on intake manifold near throttle body (driver side of engine)
Procedure
- 1Remove engine cover if equippedGrasp the engine cover firmly and pull upward to release the retaining grommets. Set cover aside. Some trim levels do not have this cover.
- 2Disconnect MAP sensor electrical connectorPress down on the locking tab of the electrical connector while pulling the connector away from the MAP sensor. If connector is tight, gently wiggle while pulling. Do not pull on wires.
- 3Remove MAP sensor mounting screwsUsing a 10mm socket, remove the two screws securing the MAP sensor to the intake manifold. Keep screws in a safe place for reinstallation. The sensor is mounted directly to the intake manifold plenum.
- 4Remove MAP sensor from intake manifoldCarefully pull the MAP sensor straight out from the intake manifold. The sensor has a rubber grommet seal that may require slight wiggling to release. Inspect the grommet for damage or deterioration.
- 5Inspect mounting locationCheck the MAP sensor port on the intake manifold for debris, oil residue, or damage. Clean the mounting surface with a clean, lint-free cloth if necessary. Do not allow debris to enter the intake manifold.⚠Do not spray cleaners directly into the MAP sensor port as contamination can damage the intake system
- 6Install new MAP sensorEnsure the rubber grommet is properly seated on the new MAP sensor. Align the sensor with the mounting holes and press firmly into the intake manifold port until fully seated. The sensor should sit flush against the manifold surface.
- 7Install and torque MAP sensor screwsInstall both mounting screws and hand-tighten. Using a torque wrench, tighten screws in a cross pattern to specification. Do not overtighten as this can damage the sensor housing.Torque specMAP Sensor Screws3 Nm (2 lb-ft)
- 8Reconnect electrical connectorApply a small amount of dielectric grease to the sensor terminals if desired. Push the electrical connector onto the MAP sensor until you hear/feel a positive click indicating the locking tab is engaged. Gently tug to verify connection is secure.
- 9Reinstall engine coverIf equipped, align engine cover grommets with mounting posts and press down firmly until all grommets are fully seated.
- 10Reconnect battery and clear codesReconnect the negative battery terminal. Start the engine and allow it to idle for 2-3 minutes. The check engine light should illuminate briefly during startup then extinguish. If light remains on, use an OBD-II scanner to verify no new codes are present.
Reassembly
- Torque all fasteners to specified values using a calibrated torque wrench
- Ensure electrical connector locks positively into place
- Verify engine cover is properly seated if equipped
Verification
- Start engine and verify it idles smoothly without rough running or hesitation
- Check that no check engine light is illuminated after startup cycle completes
- Use OBD-II scanner to verify MAP sensor is reading properly (typically 29-39 kPa at idle, sea level)
- Test drive vehicle and confirm normal acceleration and turbo boost response
- Verify no vacuum leaks are present around the MAP sensor installation