The intermittent low-oil-pressure light was traced to a crushed oil filter after a recent oil change; replacing the filter and changing the oil resolved it temporarily. If the light returns, inspect the valve cover for sludge, confirm the PCV/crankcase vent is not restricted, and consider the oil pickup screen only if the oil history suggests heavy contamination.
The owner of a 2011 Volkswagen Jetta with a PZEV engine asked where the oil pressure sensor is located because the low oil pressure light came on intermittently at low speeds after a recent oil change. The expert said the blue oil pressure switch and brown reduced-pressure sensor are behind the alternator, below the intake at the rear of the engine, and are easier to reach from below after removing the splash shield. The expert distinguished the switch from the sensor and suggested checking for a collapsed oil filter. The mechanic found a crushed filter, changed the oil, and cleaned condensation from under the valve cover, which temporarily fixed the light. When it returned, the expert advised checking for sludge and a restricted PCV/crankcase vent before suspecting a clogged pickup screen. A later question about a 2008 Rabbit was redirected as a separate post.
