P171 and P174 codes help....

[workfromhome]

I have a 2009 maxima v6. Is their a diagram showing where the o2 sensors are located? I keep getting p0171 and p0174 codes. We have changed all spark plugs. Mechanic said he changed Bank one sensor one or two. When I stop at a light the car shakes alittle and rpm goes up. It does this a couple time then check engine light comes on. Not sure what to do. Thanks

[frapjap]

Welcome to NICO!

Sorry to hear that your car is having trouble. I'm not all too well versed in your vehicle, but can offer an option for you.
Here at NICO, we have Factory Service Manuals available free to members. Take a peek at the link in my signature and find the FSM for your car and you'll have all the info you'll ever need to make the repair and try to diagnose it for yourself while posting the progress in this thread. Typically the 02 sensors are in the exhaust near the block. It'll look something like this:


You may also want to check for vacuum leaks.
Do this by getting the car running and spraying carb cleaner around any and all vacuum hoses (one by one) and listen for the engine to rev up. If it does, spray again and isolate the area and potential hose. Replace it and see if a difference is made.