I have an 03 tahoe Z71 with the 5.3L that is throwing a code that says the left bank is running lean. I haven't noticed any performance issues, but I was wondering if that could be a bad MAF? No other codes have been thrown.

 

I'd suspect an O2 sensor

 

Those are all new. Replaced about six months ago.

 

New dosen't mean good. If it where maf you'd have a performance dtc, and it wouldn't (IMO) just show one bank lean. You can however clean the maf, use maf sensor cleaner.

 

Thanks, I'll try that.