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Home >> Mercedes Benz >> 1992 >> 400E >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.2L >> Self-Diagnostic System >> Pretest Conditions

Pretest Conditions

Start and run engine until engine oil temperature is 176°F (80°C). Turn air conditioning off. Ensure shift lever is in Park. Check all fuses and replace as necessary. Verify battery voltage is 11-14 volts.

NOTE: For component locations, see the appropriate THEORY/OPERATION - 4.2L in the ENGINE PERFORMANCE section.
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