2003 NISSAN Sentra QG15DE/QR20DE (B15)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Timing belt replacement critical on SR20DE to avoid engine damage
• Potential for suspension wear in high mileage models

First checks

• Inspect timing belt condition for SR20DE engines
• Check for oil leaks at valve cover gasket

Before replacing parts

• 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

• Engine and trim availability varies by market; North America primarily QR20DE 2.0L engine with 140 hp, Asia often features QG15DE 1.5L engine.
• Timing belt required on SR20DE; chain on QG15DE and QR20DE.