What this code means

The ECU detected that the fuel trim adaptation value for a specific load group on Bank 1 has exceeded its allowable range. This is a more granular fuel trim fault than general lean/rich codes.

Symptoms

• Check Engine Light
• Poor driveability at specific load points
• Rough running under load
• Possible misfire at certain RPM ranges

Common causes

• Vacuum leak that worsens under load
• Fuel injector performance degradation
• MAF sensor drift at specific airflow ranges
• Intake manifold flap issue
• Fuel pump losing pressure under load

Diagnostic steps

1. Monitor fuel trims across RPM and load ranges
2. Perform boost leak test on turbocharged models
3. Test fuel pressure under load
4. Check MAF sensor readings vs specifications
5. Inspect intake manifold flaps

Repair notes

Address the load-specific fuel trim issue by repairing vacuum leaks or replacing degraded components.

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