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Home >> Oldsmobile >> 1995 >> Ninety-Eight 3.8 1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> ECM/Pcm Code Charts >> Code P1520, Park/Neutral Switch >> Test Description
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Test Description

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. Checks for closed switch in Park.
  2. Checks for on open switch in Drive.
  3. Ensure scan tester does not indicate P/N "actual" as yes even when wiggling shifter. This tests for an intermittent or misadjusted switch.
Fig 1: Code P1520 Schematic (3.8L) Park/Neutral Switch
G95C13856
Fig 2: Code P1520 Diagnostic Flow Chart (3.8L) Park/Neutral Switch
G95B13855