Cold Air Intake for Toyota Tundra (2012-2020) 5.7L Engine

The Wrench Time

• Estimated Time: 45-60 Minutes
• Difficulty: 3/10 - Straightforward driveway bolt-on with basic hand tools.

Tools You Will Need

• 10mm socket and ratchet (with 6-inch extension)
• 12mm socket (for factory lower airbox mount bolt)
• 10mm open-end wrench
• #2 Phillips screwdriver or precision hand screwdriver
• 8mm nut driver or flat-blade screwdriver (for hose clamps)
• Panel popper tool or needle-nose pliers (for wiring harness retaining clips)

Phase 1: Removing the Factory Part

1. Disconnect the Battery: Pop the hood on your 2012-2020 Toyota Tundra 5.7L and loosen the negative battery cable using a 10mm wrench. Isolate the terminal away from the post to wipe stored fuel trims and prevent an accidental short.
2. Unplug the MAF Sensor and Harness: Carefully squeeze the release tab on the MAF sensor electrical plug and pull back to disconnect. Use a panel popper tool to detach the plastic harness loom anchor pinned to the stock upper airbox lid.
3. Disconnect Breather and Vacuum Lines: Using your fingers or pliers, squeeze and slide back the spring clamps on the crankcase ventilation (PCV) hose and vacuum switching valve lines running into the factory intake resonator. Gently twist and pull the hoses off the plastic barbs.
4. Loosen OEM Clamps and Remove Lid: Use a 10mm socket or flat-blade screwdriver to loosen the hose clamp securing the factory intake bellows to the throttle body. Pop the metal spring clips securing the upper airbox lid, pull the OEM intake tube off the throttle body, and lift the assembly out of the engine bay along with the factory panel filter.
5. Remove the Lower Airbox Assembly: Look inside the bottom of the lower factory airbox. Locate and remove the single mounting bolt using a 12mm socket and extension. Firmly pull the lower box straight upward to pop the rubber mounting pins out of the inner fender sheet metal grommets, then pull the box free from the engine bay.

Phase 2: Installing the Cold Air Intake for Toyota Tundra (2012-2020) 5.7L Engine

1. Transfer the Factory MAF Sensor: Using a #2 Phillips screwdriver, back out the two OEM retaining screws on the stock MAF sensor. Delicately extract the sensor straight up, ensuring the rubber O-ring seal remains intact and undamaged. Seat the sensor into the new intake tube adapter flange in the correct direction (opening facing incoming filter air) and tighten down the supplied hardware with a hand screwdriver until snug. Do not use power tools; stripping this plastic or aluminum pad is an expensive mistake.
2. Mount the Aftermarket Heat Shield/Airbox: Position the new cold air heat shield or lower enclosure into the factory location on the inner passenger fender of your 2012-2020 Toyota Tundra 5.7L. Align the base with the factory grommet locations and secure it using the factory hardware with a 12mm socket or the kit-supplied fasteners.
3. Install Throttle Body Coupler and Intake Tube: Slide the silicone coupler onto the 5.7L throttle body with two loose clamps. Slide the intake tube into the coupler and through the heat shield aperture. Adjust the alignment to guarantee the tube is not rubbing against the air conditioning lines or radiator shroud, then tighten down both clamps with an 8mm nut driver.
4. Attach Filter, Breathers, and MAF Harness: Secure the high-flow air filter onto the intake tube velocity stack inside the box using an 8mm nut driver. Reconnect all factory PCV and vacuum hoses to the new intake bungs, securing them with the factory spring clamps. Reconnect the MAF wiring harness until you hear an audible click.
5. ECU Idle Relearn (Critical Step): Reconnect the negative battery terminal using your 10mm wrench. Start the engine. DO NOT touch the gas pedal for at least 20 to 30 seconds. Allow the 3UR-FE engine control module (ECM) to adjust to the increased unthrottled airflow, calibrate base idle, and calculate short-term fuel trims. Listen for vacuum leaks or whistling around couplers before your test drive.

Disclaimer: This is a general guide provided for the 2012-2020 Toyota Tundra 5.7L. Always refer to your factory service manual for exact torque specifications and safety procedures.