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The yellow light is caused but the sensor in the oil pan. When changing the oil the next time you might need to replace the sensor. It is right next to the oil plug. The oil warning light is in place of a guage. The sensor is designed to trigger if the oil pressure falls too low. If the oil pump is not working properly, the oil light will come on. If you had a guage, you would be able to see what the actual pressure is, and whether or not it is lower than ususal. If you think that the oil pump is bad, then remove the valve cover(s) and start the engine. If oil is spurting out of the rocker arms, then the pump is working. If there is no oil flowing over the head, then the pump is not working.

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Q: Yellow oil light stays on my BMW E46but oil ifs at full mark?
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