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Question # 13
An OBD II vehicle has a stored DTC P0171 (System Too Lean Bank 1). Short-term fuel trim is +22% at idle, but decreases toward normal at higher RPM. What is the most likely cause?
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L1 Overview
| Name | Automotive Service Excellence Level 1 |
| Code | L1 |
| Vendor | Skilled Trades |
| Certification | ASE |
