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LeesTruk · 05-10-2018, 06:45 PM

Rich, those codes are heater circuit codes for your O2 sensors. One or both sensors may be bad. Do you have a scan tool that'll give you live data? Unplugging your MAF sensor puts the PCM into a speed density mode (I'm pretty sure) so the PCM may not "look" at the O2s for fuel scheduling purposes

05-10-2018, 06:45 PM	#2
LeesTruk Registered User Join Date: Mar 2015 Location: Manchester, CT Posts: 429	Re: 6.0 Swap Stumbling Idle Rich, those codes are heater circuit codes for your O2 sensors. One or both sensors may be bad. Do you have a scan tool that'll give you live data? Unplugging your MAF sensor puts the PCM into a speed density mode (I'm pretty sure) so the PCM may not "look" at the O2s for fuel scheduling purposes