I went to start my '99 Tahoe the other day and it was running a little rough at start. A few moments later the "service engine soon" light came on. I "rented" the OBD tool from Checker and this was the code that was displayed "PO171" (System too lean-left bank).
I reset the PCM, and the warning light went away, but returned the next day....
Does anybody know whats the deal with this code??
I reset the PCM, and the warning light went away, but returned the next day....
Does anybody know whats the deal with this code??