I own a 2001 Hyundai Sonata. Check engine light is on, and I'm getting an error code P0171, Bank 1 System too lean.
I figured I'd start eliminating problems, so when I ran an ODB check, what I got was a lot of monitors were in Ready mode, except the following:
I've driven around countless miles, but somehow I can't get these monitors in ready. The first thing I've started with was checking the O2 sensor. I can't figure out which O2 sensor I'm checking, and I don't know where Bank 1 is. I'm not sure if I pulled out the right sensor, but I think the sensor before the converter would be bank 1?
Images are provided: (This is a sensor that I haven't yet pulled out just yet)
This is the sensor I think that won't go in ready mode, but I'm not sure:
The above sensor was a sensor right below the sensor in the first picture, going into a pipe, I'm assuming the exhaust to the converter.
Is it possible you guys happen to know what 02s I need to check? Again, it shows the O2S not in Ready mode, and I've driven for a while and it still isn't on.
The error code is P0171 Bank 1 System Too Lean