I am a Mechanic from Ont.canada. I am working on a 2004 Chev Epica with aprox. 99 000kms with the complaint of "lack of power" Aprevious attempt to repair the issue was preformed by doing a tune up. The plugs (NGK), coil boots, fuel and air filters, bank2 sen1 02 sensor were replaced. Launch scanner revield missfires on #'s 3, 4,& 5 cyls and a PO158 voltage high on bank 1 sen2 O2. if this code is set the missfire disappears. if the codes are cleared, the missfire redevelops untill the code sets again...??????? What is the probable cause
Jul 31, 2011 at 9:43 PM