P0158 & P2197 Error Codes Troubleshooting

The other day my CEL and traction light came on on my way to work. I used the scangauge and got the two codes above. A little googling returned a few worthy threads but nothing definitive. Some mention gas caps, others A/F sensors. This a thread to document my troubleshooting of the issue, maybe it'll help someone in the future.

A few data points:
2010
~65k miles
Truck seems to be performing the same as usual
All maintenance preformed by me and per the schedule with the exception of sparks plugs, they've never been changed (don't judge me)
MAF has never been cleaned
Gas cap seems tight but it always feels a little weird trying to get to that first click

Not that I think its attributing to it but the first thing I'm going to do is replace my spark plugs and clean the MAF. If nothing else this will ensure my maintenance schedule is all up to date and make me feel better. I'm also going to tighten the heck out of my gas cap just for shits and grins. Then clear the codes and drive to work which seems about far enough to get the CEL to throw if its going to. If that doesn't work I'll order a new gas cap since that's pretty cheap. After that I'll swap in a new A/F sensor since that is relatively inexpensive too. If its still throwing the error codes after that I will stop spitballing the troubleshooting and actually do some real diagnosing, whatever that means since I'm just a youtube mechanic.

More to come. Chime in if you have something or if you just want to talk shit

 

O2 sensor. A deep search would probably pin point which one.

 

I'll add it to the list to check since they're cheap and easy too. Thanks!

 

I would put my finger on a faulty o2 sensor. If you still have the code after you replace the sensor, check for exhaust leaks. You'll be able to feel around your manifold and exhaust ducting for blowing exhaust. Take care because it'll get hot quickly and ensure you have adequate ventilation. Those are the two easiest troubleshooting methods I can think of. Anything beyond that would lead me to believe somethings funky with the o2 wiring.

-J

 

Thanks J!

 

So code P0158 was cleared by replacing the bank 2 downstream o2 sensor.

I think I just cleared to P2197 code by replacing the upstream o2 sensor.

Finished up and then drove it around for about 30 minutes and the CEL didn't come back on. Usually mine resets in like 15 minutes of driving so my fingers are crossed. Tomorrow I'm going to run to the smog place and see if it'll pass.

Part numbers:
Downstream - NTK 24780
Upstream -

$111 NTK 24661 Oxygen Sensor

NTK 24661

I'll post up again when I have confirmation I passed smog.

 

Passed smog

Hopefully this helps someone in the future.

 

My notes since I forget things and a snap of the Haynes manual for reference.