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Recently have been having problems with my 2001 Kia Sportage, had the oil filter, pcu value and spark plugs changed about two weeks ago. Now whenever I press on the brakes or turn my truck on, it starts to shake and feels as if it would stall. Scanner is reading a "PO171 System too lean bank 1" What should I have my mechanic change.0? I don't want to get overcharged on something I don't need, thank you
Vehicle: 2001 Kia Sportage

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P0171 Fuel trim lean Bank 1

This code a condition of the engine management system . Having a problem such as hard to start or step on the brake , then you feel the shaking , this has to be thoroughly inspected for the cause , Low fuel pressure can cause this condition, a disconnected vacuum hose can cause this condition, The inspection for the lean condition has to be perfromed

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