Diagnostic Code Question

[taterkyle]

The "check engine" light has appeared once again for me. This time I got a
"P1129" code that shows Downstream HO2S sensors swapped. What does this mean and whats the fix? Haven't touched a thing under the hood or anywhere else in months.

 

[Howard]

The code means that the wires for left and right bank sensors have been swapped. Anyone been messing with plugs or just a bad connection.

 

[taterkyle]

thanks, I did a tune up (including changing plug wires several months ago) possible there is a bad connection...I will check my work.