O2 sensors throw code after spark plug change?

[Rob C]

car is stock 2010 sho. Has 115000 miles, did oil change,5w20, as is recommended in 2010 model. Swapped all spark plugs out,, and less than a week later codes p0130 and p0150, o2 sensors, pop up. Could this be related to spark plug change in anyway? Could that have messed with a/f ratio in any way to mess it up? Or unrelated and just luck running out?

 

[sperold]

My guess is it is related. ?
Any plugs get dropped. Was the gap on the money? Were they the recommended plugs?

Are the codes related to the O2 sensors before the converter, or after the converter?

 

[Rob C]

The o2 sensors are upstream, sensor1 in banks 1 and 2, pre-cat. The spark plugs are
Denso Iridium TT Spark Plug: ITV20TT which said was a direct fit ordered from advance auto parts. If the gap is right on the money I don't know, will probably pull them out and re-insert them to make sure the gap is right. They weren't dropped.

 

[SHOdded]

Are you stock or tuned? In either case. Likely the gap is too much at 0.040. Should be no greater than 0.035.

I believe the Motorcraft sp534s now come 0.030 out of the box. I think you could regap the Densos to 0.035 and be ok, but my personal preference? Put sp534s in there.

 

[6500rpm]

Imho, since you have two related dtc's on different banks I'd be looking at things common to both banks. Possibly a vacuum leak induced by moving items when changing the plugs, induction system leaks, cracked or unseated hoses, or grommets at the oil vapor seperator if applicable to the 2010. Possibly fuel composition if you filled up recently. If you have any way of looking at the fuel trim values and you see big adding values in short and long term FT, I'd monitor it and start moving things you touched or hose suspect areas down with carb cleaner while watching ST and look for a change to indicate that's your area of concern.