2004 NISSAN Altima QR25DE/VQ35DE (L31)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Intake manifold cracking on early VQ35DE engines
• Timing chain tensioner wear in QR25DE engine
• Transmission fluid degradation if not regularly changed

First checks

• Inspect timing chain for noise on QR25DE and VQ35DE engines
• Check for coolant leaks around radiator and hoses
• Verify transmission fluid condition and level

Avant de remplacer des pièces

• Save fault codes and freeze-frame data before clearing anything.
• Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
• Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

• Production of the 2004 Altima mainly targeted North American market; variations exist in powertrain availability in other markets (e.g., Southeast Asia, Middle East).
• The described engine oil capacities are service-fill amounts including the oil filter change; consult specific service manual for exact procedure.