P0521 CHEVROLET - Engine Oil Pressure Sensor/Switch Possible Causes and Repair Information for P0521 Chevrolet code. Learn what does P0521 Chevrolet means? P0521 Chevrolet Engine Oil Pressure Sensor/Switch Circuit Range/Performance 2007-2010 Chevrolet Suburban 2007-2010 Chevrolet Tahoe 2007-2009 Chevrolet Impala 2005-2009 Chevrolet Trailblazer Engine code p0521 - Ask the GM Technician - GM-Trucks Aug 28, 2013Engine code p0521. Asked by henry0016. Question. henry0016 0 henry0016 0 Enthusiast; Member; 0 not sure what your engine code is ,let me know what the 8th digit is of VIN 2007-2010 Chevrolet Avalanche, Silverado, Suburban, Tahoe. 2007-2009 Chevrolet Impala. 2005-2009 Chevrolet Trailblazer.
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