Oxygen Sensor Readings...

[uchiepulini]

hello guys need your help. i have the kia sorento 2011 with 2.4 engine. i am using the ancel obdII tool and i am curious about my oxygen sensor readings. ? im wondering if theyre good or bad (see attached pic) . i had the p0420 code before so i tried to install spacers to the downstream sensor. and after that car is throwing bunch of codes. p2271 , p2906, p0135 and p0140. do i have bad o2 sensors?T.I.A.

 

[twX]

The equivalence ratio of 0.955 means that it's running slightly rich. Check the fuel trims. If they're maxed out, the engine might not be able to lean out enough to get a stoichiometric AFR, possibly because of the spacer.

I'd install a new O2 sensor without the spacer. If that doesn't get rid of the cat efficiency code, you might need a new cat, but I'd try new spark plugs, and some fuel injector cleaner first. That code can be caused by an exhaust leak as well. If the fuel trims are high, check for a vacuum leak.

 

[wlk]

Look at your live data, for the upstream sensor is should switch fast, if lazy replace it and for the downstream it should be slow but if it switches fast replace it. Honestly if they are original I'd replace them to begin with and see if your codes go away. If p0420 returns try the spacer but may need a .