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Autopapyrus · Honda StepWGN 2.0 i-VTEC K20A (2003)
https://autopapyrus.com/guides/honda/stepwgn/intake-air-temperature-sensor-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Honda StepWGN 2.0 i-VTEC K20A (2003): Intake Air Temperature Sensor Replacement

The intake air temperature sensor measures the temperature of the incoming air and sends a signal to the ECU to adjust fuel delivery and ignition timing. On the K20A engine, the sensor is usually installed in the air filter housing or in the intake duct between the air filter and the throttle body. Replacement does not require any special tools.

Difficulty: Easy Time: 15-20 minutes Steps: 8 Tools: Phillips screwdriver or wrench (depending on mounting type), shop rag

Part

  • 🔩 Intake air temperature (IAT) sensor, OE number for K20A: Honda 37880-PLC-004 (aftermarket equivalents from Denso, NGK)

Step by step

8 steps
  1. Shut off the engine and let it cool down. Open the hood.
  2. Locate the IAT sensor. It is a two-pin sensor inserted into the air filter housing or into the intake duct before the throttle body. Inspect how it is mounted: the sensor may sit in a rubber grommet or be held by two screws.
  3. Disconnect the electrical connector by pressing the locking tab and pulling the connector off the sensor.
  4. If the sensor is mounted in a grommet, pull the sensor upward to remove it from the grommet. If it is held by screws, remove the two mounting screws with a Phillips screwdriver (the screws are usually seized; use penetrating oil if needed).
  5. Inspect the rubber grommet (if fitted) for cracks and wear, and replace it if necessary.
  6. Insert the new sensor into the grommet or secure it with the screws. Make sure the sensor sits tightly with no gaps. An air leak through a loose connection will cause fuel mixture errors.
  7. Plug in the electrical connector until it clicks.
  8. If the Check Engine light was on, clear the code with a diagnostic scan tool through the OBD-II port (located under the steering column, to the left of the driver).

Common mistakes and warnings

  • After replacement, check that the sensor is sealed properly. An air leak through a loose connection will cause a lean mixture and unstable idle. Do not use sealant on the threads or the grommet, as it may damage the sensor or cause it to seize during the next replacement.