# Unplug the IAT sensor electrical conector # To remove the IAT sensor from the air cleaner housing simply pry it out of the rubber grommet
I believe it is a input speed sensor. Hyundai calls them pulse generators on the 99 elantra.
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If the VSS is defective replace the instrument cluster.
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The upstream heated oxygen sensor is located ahead of the catalytic converter The downstream heated oxygen sensor is located behind the converter
The location for the rear defogger relay on a 1999 Hyundai Elantra is located in the trunk or hatch area of the vehicle. The relay is labeled as M25.
Trouble code P0136 means: O2 Circuit (Bank 1, Sensor 2)
Front right side
The P0713 code on a 1999 Hyundai Elantra indicates a problem with the transmission fluid temperature sensor circuit. This code typically signifies that the sensor is either malfunctioning or that there is an issue with the wiring or connectors associated with it. As a result, it can lead to improper shifting or transmission performance issues. It's advisable to inspect the sensor and its connections, and replace any faulty components to resolve the issue.
1-3-4-2
The carbon canister in the 99 Elantra is in a plastic case mounted to the frame just behind the driver's side rear tire. There are fuel vent line entering it and there is also an electric line that connects to an emission sensor.
You can probably find that out from your VIN number.