Which model is your engine?
The MAF ( Mass Air flow) sensor is located right on the intake pipe. Can't miss it.
The Intake Air Tmperature Sensor is incorporated in the Mass Airflow Meter.
A knock sensor sends a voltage signal to regulate ignition timing. In a Jetta, it is typically located under the air intake manifold.
The mass airflow sensor, on Most VW Jetta Mark IV, is located on the air line that goes from the air filter to the intake.
when facing the engine, it's screwed into the right side of the intake manifold (the big silver thingy with the 2.8 numerals) right below those two hoses.
They are located usual;ly on the intake manifold somewhere. If you own a 1.8T model, it is on the intake manifold near the Throttle Body.
Should be located behind the front driver's side bumper cover.
The speed sensor in located in the front of the motor. You can find it near the transmission and the engine split line on the Jetta.
an iat sensor is almost always located inline with the intake tube. i work on so many vw's at heart volkwagen i cant remember exactly where it is. if it is a turbo it will be most likely mounted on the inercooler. just check for a 2 wire sensor online with the intake tube.
It's on your air intake, Behind your air filter box its your maf/iat combination. but that's on my 2000 jetta 2.0??? ??? I need to know what 2 wires are for the IAT sensor???
The speed sensor on a 98 Jetta is located near the brake setup. It is on the passenger wheel area mounted to a bracket.