EVAP Purge Valve

This procedure covers the replacement of the EVAP purge valve on a 2016-2021 Honda Civic with the 1.5L turbocharged engine, located on the intake manifold.

Warnings

Tools required

Parts

• EVAP Purge Valve × 1 — Honda OEM 36162-5AA-A02 or equivalent
• Vacuum hose clamps (if damaged) × 2 — Use OEM specification

Preparation

1. Ensure the engine is cool to the touch
2. Open the hood and secure it in the open position
3. Disconnect the negative battery terminal and wait 3 minutes for electrical system discharge
4. Have a container or shop towels ready to catch any residual fuel vapors or condensation

Procedure

1. 1

   Locate the EVAP purge valve
   The EVAP purge valve is mounted on a bracket attached to the intake manifold on the driver's side of the engine bay, near the firewall. It is a cylindrical component with an electrical connector and two vacuum hoses attached. Identify the valve and trace the vacuum lines to confirm correct component.
2. 2

   Disconnect the electrical connector
   Press down on the locking tab of the electrical connector on the EVAP purge valve and pull the connector straight off the valve. Do not pull on the wires themselves. Inspect the connector terminals for corrosion or damage.
3. 3

   Remove the intake vacuum hose
   Locate the vacuum hose connected to the intake manifold side of the purge valve (typically the side closest to the engine). Using a pick tool or flat-blade screwdriver, carefully release the spring-type hose clamp and slide it back along the hose. Gently twist and pull the hose off the purge valve nipple. Note the routing for reinstallation.
   ⚠If the hose is difficult to remove, carefully warm it with a heat gun rather than forcing it to prevent tearing
4. 4

   Remove the canister vacuum hose
   Locate the second vacuum hose connected to the charcoal canister side of the purge valve. Release the hose clamp using the same method and remove the hose from the valve nipple. Keep both hoses separated and note their positions.
5. 5

   Remove the purge valve mounting bolt
   Using a 10mm socket with extension, remove the single mounting bolt securing the EVAP purge valve to its bracket on the intake manifold. The bolt may have a captive washer. Keep the bolt in a safe location.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
6. 6

   Remove the purge valve
   Carefully lift the EVAP purge valve out of its mounting bracket. Inspect the mounting bracket for damage or corrosion. If the valve is stuck, gently wiggle it while pulling upward.
7. 7

   Inspect vacuum hoses and clamps
   Examine both vacuum hoses for cracks, hardening, or deterioration. Check the hose clamps for damage or loss of spring tension. Replace any hoses or clamps that show signs of wear. Inspect the valve nipples on the new purge valve to ensure they are clean and undamaged.
8. 8

   Install the new purge valve
   Position the new EVAP purge valve into the mounting bracket, ensuring proper orientation with the electrical connector facing outward for easy access. The valve should seat fully into the bracket.
9. 9

   Install and torque the mounting bolt
   Insert the mounting bolt through the bracket and into the purge valve mounting point. Hand-tighten the bolt, then use a torque wrench to tighten to specification. Ensure the valve is properly seated and does not move in the bracket.
   Torque spec

   Mounting Bolts26 Nm (19 lb-ft)
10. 10

    Connect the canister vacuum hose
    Slide the vacuum hose from the charcoal canister onto the appropriate nipple of the new purge valve. Push it on firmly until it seats completely. Position the hose clamp over the connection point and ensure it is secure. The hose should not be able to pull off easily.
    Torque spec

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

    Connect the intake vacuum hose
    Slide the vacuum hose from the intake manifold onto the remaining nipple of the purge valve. Push it on firmly until fully seated. Position the hose clamp over the connection and verify security. Double-check that hoses are routed correctly and not kinked or stretched.
    Torque spec

    Hose Clamps3 Nm (2 lb-ft)
12. 12

    Reconnect the electrical connector
    Align the electrical connector with the terminals on the new EVAP purge valve and push it on firmly until you hear or feel a click. Gently tug on the connector to verify it is locked in place. Ensure no wires are pinched or stressed.
13. 13

    Reconnect the battery
    Reconnect the negative battery terminal. The engine control module may need to relearn idle and fuel trim values after battery disconnection.

Reassembly

1. Verify all vacuum hose connections are secure and hose clamps are properly positioned
2. Ensure the electrical connector is fully engaged with a positive click
3. Check that no tools or parts have been left in the engine bay
4. Verify proper hose routing with no kinks, pinches, or contact with hot surfaces

Verification

• Start the engine and allow it to idle; listen for any abnormal hissing sounds indicating vacuum leaks
• Check for diagnostic trouble codes (DTCs) using an OBD-II scanner; clear any existing EVAP codes and verify none return
• With the engine at operating temperature, verify the purge valve operates by listening for a clicking sound from the valve during normal operation
• Perform an EVAP system test using a scan tool with active test capability to command the purge valve open and verify proper function
• Monitor fuel trims and ensure they remain within normal parameters (-10% to +10%) after the repair
• Road test the vehicle and verify no check engine light illuminates and no driveability issues are present

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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