2004 NISSAN Sentra QG15DE/QR20DE (B15)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Window regulator failures
• Ignition coil pack issues
• A/C evaporator leaks in humid climates

First checks

• Verify engine oil condition and level
• Check timing chain noise or stretch
• Inspect transmission fluid condition and level

Vor dem Teiletausch

• 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

• Markets differ by engine availability: QG15DE common in Asia and Latin America; QR20DE dominant in North America.
• Technical data reflects majority production for global markets; some markets may have minor specification variations.