Thanks Keith, I will look into that. I went on my lunch break to get more codes read. Prior to me cleaning the EGR I was not getting my SEL at all. Once I cleaned and replaced, it came back on and threw 3 new codes that were not being thrown last time I had it checked.

P0172
P0405
P0134

All seem to resolved around the same issues. With these codes in place, what should be my first step in diagnosing my car? Also appreciate you taking the time to write up all of this info and shoot me some tips. Been a big help.

Side note, I drove it without the O2 sensor last night, with the EGR plugged in and it drove much better than it does with the O2 sensor in.

 

If you got the code P-134 before you unplugged the O2 sensor, then the sensor is not working. Unplugging the sensor will get you this code. This code is the cause of P0172, system too rich.

P0405 is an EGR code and it could have come from unplugging the EGR valve a couple days ago. It is saying that the 0.35 volts on the sensor wire is missing, which it would be if the connector was not plugged in.

Have you considered buying your own code reader. I have seen them pretty cheap at Harbor Freight tools. If you have a smart phone, there are apps and bluetooth devices that can do a lot of diagnostics for as little as $29 on the internet. I haven't tried any as I don't have a smart phone and i don't want one.

In the meantime, you need to get those codes cleared, you can disconnect the ground terminal from your battery for 40 seconds to do that, hook everything up and drive around for a day, or until the MIL comes on, then get the codes read. Disconnecting the battery might be the best way, it forces the computer into a new learning mode.