2013 Sierra 5.3

[sandeep singh]

I have 2013 Sierra 1500 and yesterday I got both codes 015b and 015 d as well first cylinder misfire.

Mechanic says there's oil on that spark plug.

He says it's a common problem with this year.

Is it true and did it happen to anyone and how did you fix it.

Thanks in advance

[dsr611]

Those codes refer to the O2 sensors

P015B--https://www.autocodes.com/p015b_chevrolet.html

P015D--https://www.autocodes.com/p015d_chevrolet.html

 

Oil on spark plug can cause a misfire.  Need to find out what is causing that

https://mechanicbase.com/engine/oil-on-spark-plugs/

[CamGTP]

Cylinder 1 is a AFM/DoD cylinder. My guess is that for the oil on the plug.