P0171 Diagnostic Trouble Code Discussion for September 2025
Fuel System Lean (Bank 1)
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| Help Request | Posted | |
| 1999 Lexus RX300 3.0L MIL Lamp on VIN: JT6HF10U7X P0171: Fuel trim lean bank1. Has code for bank1 lean but both banks lean. I know Toyota and Lexus have knock sensor and pigtail problems. First looking at data short trims are about 1 to 3 %. Long trims are high 40 to 50 %. When first turn key on engine off longs are to about 40%. Did... |
September 23, 2025 |
