S15/T15 Sonoma P/U 2WD L4-2.2L VIN 5 Flex Fuel (2001)
Engine Oil Pressure: Testing and Inspection
Oil Pressure Diagnosis and Testing
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Low oil level. Fill to full mark on oil level indicator.
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Incorrect or malfunctioning oil pressure switch
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Incorrect or malfunctioning oil pressure gauge
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Improper oil viscosity for the expected temperature
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Oil pump worn or dirty
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Malfunctioning oil pump pressure regulator valve
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Plugged oil filter
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Oil pump screen loose plugged, or damaged
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Excessive bearing clearance. Replace as necessary.
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Cracked, porous or restricted oil galleries. Repair or replace block.
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Oil gallery plugs missing or incorrectly installed. Install plugs or repair as necessary.
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Oil diluted by moisture or unburned fuel
