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1999 xj8 withn a p1647 code. check engine light on . engine hesitates part throttle runs rough
Hello and welcome to justanswer.com
P1647 is for the B bank upstream oxygen sensor. This will be the front sensor on the passenger side cat converter. It's the one with a grey connector. That code is usually caused by the sensor but I have also seen issues with the harness going to the sensor.