In the 1980s and 1990s, Honda -- along with many Japanese manufacturers -- developed something of a reputation for high-tech vehicle controls. Some might chalk that up to a simple manifestation of Japanese technophilia, but Honda's never been one to complicate things just to complicate them. Computer controls allowed Honda to build cars that did what Hondas have always done best: provide excellent efficiency, low emissions and usable performance in a small package. There's a flip side to that, though, since every critical sensor is a potentially critical failure point. But on the Accord's base four-cylinder engine, replacing the IAT is not difficult.
Identify the IAT sensor. It's on the intake manifold -- the large, central air chamber that directs air into the engine after the throttle body. It's on the top-back of the intake, pointing toward the firewall.
Disconnect the sensor's electrical connector. Use a wrench to grab the hex-head base around the sensor and unscrew it.
Wrap the threads of the new sensor with a double-layer of Teflon tape. Screw the sensor into the manifold by hand.
Snug the sensor down with a wrench until it's fully seated and will turn no further. Avoid over-tightening the sensor; you need only enough pressure to seat the sensor and compress the Teflon tape.
Plug the sensor in, start the car and take it for a test drive. If the check-engine light doesn't turn off after a few minutes, drive the car to your local chain auto parts store and ask to use the OBD-II code scanner. Use the scanner to clear your stored diagnostic codes; you'll probably have to clear the codes yourself, since most stores won't do it for liability reasons.
