1500 Classic - Mass Air Flow (MAF) Sensor Replacement 🚚

On your 5.7L HEMI, the MAF function is built into the intake air temperature (IAT) / air flow sensor in the air intake tube, just after the air filter box. The swap is straightforward if you go slowly.

Safety & Prep ⚠️

• 🧤 Work safely
  • Park on level ground, set the parking brake, and shift to P.
  • Let the engine cool for at least 20–30 minutes.
  • Disconnect the negative battery cable (10 mm) to avoid check-engine lights or short circuits.

Tools & Parts You’ll Need 🧰

• 🔧 Basic tools
  • Ratchet (small hand wrench that takes sockets).
  • 10 mm socket (battery terminal).
  • Torx bit set (usually T20 or T25 for the sensor screws on the intake tube).
  • Small flathead screwdriver (to gently lift connector locks if needed).
  • Clean rag.
• 📦 Parts
  • New MAF/IAT sensor for a 2020 1500 Classic 5.7L (match the connector and mounting tab shape).
  • New O-ring / seal if it doesn’t come pre-installed on the sensor.

Sensor Location 🔍

• 📍 Where it is
  • Open the hood.
  • Find the air filter box on the passenger side front of the engine bay.
  • Follow the large black plastic intake tube that runs from the air box toward the throttle body (engine).
  • The sensor is mounted in this tube, usually on the top or side, with:
    • 1 electrical connector.
    • 2 small Torx screws or a twist-lock style mount.

Step-by-Step Replacement 🛠️

1. Disconnect the battery
   • Use the 10 mm socket to loosen the negative (-) battery terminal.
   • Lift the cable off and tuck it aside so it can’t spring back.
2. Access the sensor
   • Stand on the passenger side and look at the intake tube.
   • Locate the sensor body and its electrical connector.
3. Unplug the electrical connector
   • Most Ram connectors have a red or gray lock tab:
     • Slide the colored lock tab out (usually 2–3 mm) with your fingernail or a small flathead screwdriver.
     • Press down on the main release tab and gently pull the connector straight off.
   • Tip: Never pull on the wires; only pull on the plastic plug.
4. Remove the old sensor
   • If it’s held by screws:
     • Use the correct Torx bit (T20/T25) and ratchet or screwdriver handle.
     • Remove the 2 screws and keep them safe; you’ll reuse them.
     • Gently twist and pull the sensor straight out of the intake tube.
   • If it’s a twist-lock style:
     • Rotate the sensor body counterclockwise about ¼ turn.
     • Pull it straight out.
   • Inspect the O-ring or seal; make sure it comes out with the sensor.
5. Prepare the new sensor
   • Compare the new sensor to the old one:
     • Same connector shape.
     • Same mounting tab positions.
     • Same O-ring location.
   • If the new sensor has a separate O-ring, install it in the groove on the sensor body.
   • Do not touch the tiny sensing element inside the sensor; oils from your fingers can damage it.
6. Install the new sensor
   • Wipe the inside of the intake tube opening with a clean rag to remove dust.
   • Insert the new sensor straight into the opening, making sure:
     • The O-ring seats fully.
     • The sensor sits flat and is not cocked or tilted.
   • If screw-mounted:
     • Install the screws by hand first to avoid cross-threading.
     • Tighten gently with the Torx bit. These are small screws—just snug, about 20–25 in-lb (2–3 N·m). Do not overtighten or you can crack the plastic.
   • If twist-lock:
     • Insert, then rotate clockwise until it stops and locks.
7. Reconnect the electrical connector
   • Push the connector straight onto the sensor until it clicks.
   • Slide the red/gray lock tab back into the locked position.
8. Reconnect the battery
   • Reinstall the negative (-) battery cable on the terminal.
   • Tighten the 10 mm nut snugly; don’t overtighten.

After Installation ✅

• 🚗 First start
  • Turn the key to RUN (or press Start without pressing the brake) for 10–15 seconds, then off. Do this twice to let the PCM “see” the new sensor.
  • Start the engine and let it idle for a few minutes.
  • Idle may be slightly rough for the first minute while the computer relearns.
• 💡 Check for issues
  • Make sure there are no warning lights after a short drive.
  • If you had a check-engine light before, you may need a scan tool to clear stored codes faster, but many will clear on their own after several drive cycles if the problem is fixed.

Quick Tips & Common Mistakes 🧠

• 🧩 Use the correct sensor
  • Cheap “universal” sensors often cause more problems (rough idle, poor fuel economy). Stick to OEM or a known brand.
• 🧼 Don’t spray random cleaners
  • Only use dedicated MAF cleaner if you ever clean the old sensor; never use brake cleaner or carb cleaner.
• 🌬️ Check the air filter
  • A very dirty air filter can shorten sensor life; this is a good time to inspect or replace it.

If you’d like, tell me if your sensor is held by screws or a twist-lock, and I can tailor the steps even more tightly to what you’re seeing under the hood.

HowToo makes it easy: below this answer you’ll see the correct sensor and any tools you might need. You can add them to your cart right from the parts section for fast shipping. 🚀