I have a 96 corolla and the air intake sensor is on the housing for the air filter. It's on the part of the housing that can be taken off.
The 1998 Toyota Corolla air intake temperature sensor can be found on the air intake hose. The air intake hose will come from the air intake box and proceed to the engine.
Which model is your engine?
The PCV valve on a 1998 Toyota Corolla is located on top of the engine, on the passenger side. It connects the intake manifold with the valve cover.
The engine coolant temperature sensor and coolant temperature gauge sender are located on the passenger's side of the engine, under the intake manifold.
as intake air temperature increases it lead to decreas in i.c engine efficiency. as engine efficiency is ratio of difference in intake and outlet temperature to intake temperature.
The Cylinder Head Temperature (CHT) sensor for the 2.3L engine is located between the two center ignition coils. The Engine Coolant Temperature (ECT) sensor for the 3.0L engine is located in the intake manifold to the right of the thermostat housing. The Engine Coolant Temperature (ECT) sensor for the 4.0L engine is located in the intake manifold behind the thermostat housing.
on the intake manifold near housing
The intake air temperature sensor is located on top of the intake. In a 1990 Toyota Camry the air temp sensor assures the ECU the engine is running at optimal temperature.
On my 1998 Aurora with 4.0L v8, the air intake temperature sensor is located on the air filter housing on the driver's side of engine compartment.
The intake temperature sensor is located on the side of the air filter case on a 2003 Chevy Silverado 4.3 1500. It is on the top of the engine.
The coolant temperature sensor on a 1989 Ford I6 4.9L engine is located on top of the engine, in the intake manifold. It notifies the engine when to turn on the cooling fan.
It is located under the intake manifold. With the hood open, look under the plastic intake manifold and it screws into the engine block. I removed the intake to get at mine. Not a very fun job.