New code today

[GngrBeardMan]

Was driving home from Texas Roadhouse tonight and got a check engine light. Thought it was just the p0420 code that I have had since i bought her. The previous owners told me they replaced all the o2 sensors so it is most likely a bad cat. Turns out that this code was a p2270 instead. Anyone have experience with that code and willing to share some wisdom? I'm hoping it's something simple like a bad o2 sensor

 

[AWAR]

You are correct.

 

[BigRed2004]

@GngrBeardMan, the code does say it’s a bad O2 sensor, but it may not be the O2 sensor directly. Before buying and replacing the O2 sensor, check the various vacuum lines, your fuel rail Schrader valve, fuel pulse dampener on the rail, make sure the fuel rail is snug and secure, and all other various hoses. Your air fuel ratios being off can trick the O2 sensor into thinking you are running lean when you are not, and it may not flag in the ECU as a different code.

 

[AWAR]

So you had two codes for bank 1 sensor 2, P0420 and P2270. How did you know you had a new code if P0420 is always there? If you clear them how long until the light comes back on? Is your exhaust how it came from the factory? Does it have two cats on each side?