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Home › Buick › 2002 › Century Custom › Repair and Diagnosis › Engine Performance › System › Engine Control System Self-Diagnostics - 3.1L Engine › Diagnostic Tests › DTC P0171: Lean Fuel Trim System (Bank 1) › Conditions For Setting DTC

Conditions For Setting DTC

The average long term fuel trim value is greater than 20 percent for 6 seconds.

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