PO174 engine code.

[Dibly74]

My car is giving a Service Engine Soon light and when I got the codes pulled it came up as this. PO174 System to lean, Bank 2. I just replaced all 4 O2 sensors about 8 months ago and they are all in warranty. I was wondering if something else could be making the O2 sensors pick up this code. I went about 132k miles on my original O2 sensor and never gave a code. When I replaced them my car ran slightly better for about 3 months then started having an off idle that it had before I changed them. Can anybody tell me which of the 4 that it is or even what bank 2 is and I will send both of them back.

[pro-five-oh]

The PCV valve and its vacuum hose (on the valve cover) is known to cause a lean code.

Do a search here for more information...search the Continental archives too.

[Dibly74]

Thanks, its pretty new but I'll change if anyway again just for the heck of it. But can someone tell me what side of the engine bank two is on?