what the hell is this i threw it this morning as well as a P0171. i havent had any codes for almost six mon and all of a sudden two of em and P0054 isnt even a code my mac tools scanner says code not supported does anyone no what this is? the only thing i recenly did was unplug my rear o2 sensor to install a wideband but the sensor was already turned off by zzp custom tune... could this be related and if so what should i do?

 

It might have something to do with it... I'll have to check into it.... Here check into this thread it seems Super_SS had the same problem, and from what they are explaining is your cat might be clogged, from added boost from your mods, hopefully this will help you out, G/L

 

yeah thats wierd p0054 isn't even listed in my service manuals for the cobalt, p0354 is the only one close if it was read wrong, but thats #4 ignition coil.

 

P0054 HO2S Heater Resistance Sensor 2 ECM

 

thank you so im thinking it was related now...