Hello! I have a 2006 chevy cobalt ss supercharged with 90,000 miles. Basically stock besides K&N cold air intake. The car has lately been throwing check engine codes. I have gotten p0172 System too rich bank one, p1183, p0455, and p0033 Turbo/Supercharger bypass valve control circuit/open. I am wondering if the p0172 is related to the o2 sensor??? The car only runs 3psi of boost, will not hit redline, and tops at 80. In 3rd gear the car boggs once it hits 3500 rpm, and boggs at 4000 rpm in 4th gear. I tested the MAF by unplugging and attempting to run, however the car bounced to 1k rpm and died, I do not believe MAF related. Can a bad intercooler be a cause of the lack of power, bogging, and small amount of boost? I have read reviews where the plugs and fuel filter are junk after 50k miles. I replaced both and no dice. Also can a plugged cat be a factor? Really appreciate the help, thanks in advance!

 

P0712 could be an o2 sensor. Sounds like the car is in limp mode. Maybe try disconnecting the battery for 10 minutes or so to reset it. And a plugged cat is always possible but that usually results in boost being higher than normal

 

I think the P0172 is related to whatever your other problem is, probably NOT a O2 sensor.

P0033 Supercharger Bypass Valve Solenoid Control Circuit -PCM
P1183 Supercharger Inlet Pressure Sensor Circuit Low Voltage -PCM
P0455 Evaporative Emission (EVAP) System Large Leak Detected -PCM

You have two codes related to the Supercharger so I would start troubleshooting there.

The EVAP code is probably a separate issue as well. More than likely one of the EVAP solenoids is malfunctioning.