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Mixture to lean bank # 1
Look for in order of likely hood:
- Misfire bank #1 (But there should be a miss fire code as well)
- Exhaust leak before or close after the O2 sensor for bank 1
- Bad or faulty O2 Sensor
- Vacuum leak on a Bank one Cylinder or intake point feeding any or all of bank one
- Dirty or faulty fuel injector (Could be a wiring fault causing this as well)
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