In a 1998 Honda Accord, the intake air temperature (IAT) sensor is typically located in the intake tract—either in the air intake hose near the air filter box or integrated with the MAF sensor housing near the throttle body. Some trims rely on the MAF assembly for temperature data, offering no separate IAT sensor.
What the IAT sensor does and why it matters
The IAT sensor provides the engine computer with current air temperature data, which helps the ECU optimize fuel delivery and ignition timing. Cold air is denser and can require a richer or leaner mixture depending on the engine load; hotter air can reduce density and alter the same calculations. Accurate IAT readings help the Accord run smoothly, especially during cold starts and varying weather conditions.
Common locations on a 1998 Accord
These are the most likely places you’ll find an IAT sensor on this model year. Inspect the intake tract from the air filter box toward the throttle body.
- In the intake duct just upstream of the throttle body, mounted in or on the side of the air intake hose.
- Inside the MAF (mass air flow) sensor housing itself, if the IAT is integrated with the MAF module (some Hondas use a combined MAF-IAT assembly).
- On rare occasions, mounted directly on the intake manifold or near the throttle body with a separate connector.
In practice, you may encounter either a dedicated IAT sensor in the air duct or the absence of a separate IAT sensor altogether, with the MAF providing the temperature data to the ECU.
Is there a separate IAT sensor or is it integrated with the MAF?
Many 1998 Accords with a MAF system use a separate IAT sensor in the intake hose, but some markets and trims rely on the MAF unit to supply temperature data. To confirm, visually inspect the air intake assembly and MAF housing: a distinct two- or four-wire sensor in the duct indicates a separate IAT; if you only see the MAF unit with its own connector, the temperature data likely comes from the MAF module itself.
- Look for a small sensor with a 2- or 4-wire harness in the intake pipe or near the MAF housing. Its marking may read IAT or TT (temperature).
- If there is only the MAF sensor and no separate temperature sensor in the duct, the ECU reads air temperature from the MAF module.
Understanding whether you have a separate IAT helps when diagnosing fuel trims or performance issues, and it guides you in testing or replacing the correct component.
Summary
The IAT sensor on a 1998 Honda Accord is typically located in the intake path—most often in the air intake hose near the air box or, in some models, integrated with the MAF sensor. Some engines may not have a distinct IAT sensor if the MAF unit handles temperature data. To determine the exact setup for your car, inspect the air intake assembly and follow the wiring to the ECU. If in doubt, refer to the service manual or consult a qualified tech to identify whether you have a separate IAT or a combined MAF-IAT arrangement.