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I did brakes and changed #3 spark plug on my 2002 Ford F150 5.4L, now I get code P1129 ... why??

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I did brakes and changed #3 spark plug on my 2002 Ford F150 5.4L, now I get code P1129 ... why??

Vehicle: 2002 Ford F150 5.4L

1 Answer

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P1129 FORD - Downstream Oxygen Sensors Swapped from Bank to Bank

Read more: https://www.autocodes.com/p1129_ford.html

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