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Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Rocker arm oil control solenoid B (bank 1) stuck
Rocker arm oil pressure switch B (bank 1) failure
Rocker arm oil pressure switch B (bank 1) VCMSW line short
Rocker arm oil control valve failure
Oil passage clogged