Why does the oil light in the Passat illuminate yellow?

[VonCharlie]

Passat oil light illuminating yellow may be caused by insufficient oil volume. Specific reasons: Insufficient oil volume reduces the oil pump's pumping capacity or prevents oil from being pumped due to air intake, leading to a drop in oil pressure; excessively high engine temperature can thin the oil, causing it to leak excessively through the gaps and resulting in decreased oil pressure. Solutions: Normally, the oil indicator light on the dashboard should illuminate when the ignition is turned on and should turn off after the engine starts. If the light remains on, first check if the oil level is low. If the oil level is normal, inspect the oil warning switch and wiring for any issues. If none of the above problems are found, it is best to take the vehicle to a repair shop to check for engine or oil pump problems.