How to Install Helix AOS on 2016-2021 Civic 1.5T

Quick Answer

Install the Helix Air Oil Separator on your 2016–2021 Civic 1.5T by mounting it near the PCV valve, routing the hoses correctly, and securing all connections. Follow the steps below for a clean, leak-free installation.

Installation Steps

1. Gather tools and parts: You'll need the Helix AOS kit, a 10mm socket, a flathead screwdriver, and a pair of pliers. Ensure the engine is cool before starting. Check that the kit includes all hoses and brackets; if any are missing, contact PRL before beginning.
2. Locate the PCV valve: On the 2016–2021 Civic 1.5T, the PCV valve is on the driver's side of the valve cover. Follow the hose from the valve cover to the intake manifold. Take a photo of the stock hose routing to reference during reinstallation.
3. Disconnect the factory PCV hose: Use pliers to release the spring clamp, then gently twist and pull the hose off the PCV valve and the intake manifold nipple. Be careful not to break the plastic fittings. If the hose is stuck, use a flathead screwdriver to pry it loose—do not yank.
4. Mount the Helix AOS bracket: Use the included bracket to secure the separator to the existing stud on the driver's side strut tower. Tighten the nut to the specified torque (if provided). Make sure the bracket doesn't interfere with the hood or other components when closed.
5. Route the new hoses: Connect the hose from the PCV valve to the inlet of the Helix AOS, and the outlet hose to the intake manifold nipple. Use the supplied clamps to secure both ends. Route hoses away from hot surfaces and moving parts—use zip ties to keep them tidy.
6. Double-check all connections: Verify that both hoses are tightly clamped and that the separator is firmly mounted. Start the engine and check for any leaks or unusual noises. After a short drive, re-check the clamps for tightness—heat can loosen them.

Product Fact

• 2016–2021 Honda Civic 1.5T Helix Air Oil Separator: The Helix Air Oil Separator is designed for the 2016–2021 Honda Civic 1.5T and is available in multiple colors. You can match the separator to your engine bay while getting the performance benefit of cleaner intake air.