For this month’s tech resource, Juan dives into a tricky diagnostic rabbit hole, where he was trying to figure out why, after a repair performed at another shop, a 2007 Chevy Tahoe was experiencing a misfire and hesitation with codes P0174 and p0300 set. He ran his scan data but got conflicting results, which created even greater confusion. He checked for evap leaks (none found), tested for a bad injector (all were balanced) and checked for loose or dirty ground connections (all was correct). He then suspected a problem O2 sensor, but the vehicle exhibited the same driveability issues after replacement. Additional research lead him to a potential problem with swapped injector harnesses. Click the link to read how this mystery was solved.
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