Nagging check engine light

[ChristianDev]

I bought my car 2 months ago and for the past month I've had a intermittent check engine light. I've booked appointments with my dealer to get it fixed but of course the light was off when I took it in. Their best guess was an O2 sensor. After that was replaced a few days later the light came back on. When I took it in the second time they had my car for 2 WEEKS. They clamied to be backed up but I think they forgot about me despite my constant calls wanting an update. This is my first car purchase on my own, and I feel like they don't take me seriously because I'm only 20 years old. I'm frustrated with this dealer and out of ideas.

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[Chef jpd]

Buy an inexpensive OBD2 reader. Next time it flashes, read it immediately.
Report the code here and you will get plenty of help.

https://www.walmart.com/ip/OxGord-CAN-OBD-II-Scanner-Tool-for-Check-Engine-Light-Diagnostics-Direct-Scan-and-Read-Out/150731313?wmlspartner=wlpa&selectedSellerId=693&adid=22222222227046941441&wmlspartner=wmtlabs&wl0=&wl1=g&wl2=t&wl3=146934810922&wl4=aud-261800282140la-257964074393&wl5=9004370&wl6=&wl7=&wl8=&wl9=pla&wl10=112354462&wl11=online&wl12=150731313&wl13=&veh=sem

Also, what did they tell you when you got it back the second time?

 

[ChristianDev]

Another O2 sensor

 

[ChristianDev]

Ok so I bought a reeder from Walmart and it said the car was running lean. I looked on some previous forum threads to see what other peoples average air/fuel ratios were and my seems to be about average. 14.3 crusing and 12 accelerating. Could it just be a bad sensor?

 

[Chef jpd]

What codes did it store?
Might be multiple codes.

 

[GT Pony]

You can also try "Engineering Test Mode" to see diagnostic trouble-codes (DTC). The DTC screen is shown at time 0:32.

[ame]

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