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The OBDII trouble code P0171 - System Too Lean (Bank 1) means that the engine air-fuel mixture is too lean, or there is too much air and too little fuel. Driving a car with the code P0171 can cause more damage to your vehicle over time, as when the engine runs lean, the combustion temperature is much higher.
Sometimes a broken or damaged tooth at the crankshaft or camshaft sensor gear can be the source of misfiring; checking the sensor signal with an oscilloscope can help if crankshaft position sensor (CKP) or camshaft position sensor (CMP) are suspected. Once the problem is repaired or no longer detected, the misfiring code will clear itself after some driving.
Another plug .... OBDII Shorthand List. AFC - Air Flow Control. ALDL - Assembly Line Diagnostic Link. Former name for GM (only) Data Link Connector, the connector socket into which the scan tool plug is inserted; sometimes used to refer to any pre-OBDII computer signals.You access these usually by shorting 2 terminals on a diagnostic connector which is sometimes inside the car, sometimes under ...