Questioni get codes 13, 76, 77, I replaced both o2 sensors, and brand new egr valve along with all three solenoids, and put a new cat on,, cleared the codes with a snap on scanner,, 10 miles down the road after letting off the gas,, light comes back on,, with the same three codes,,, in the field mode driving the car with scanner i see o2 senors working along with the solenoids on the egr,, any suggestions?
AnswerHelp me so I dont have to do any more homework please. 13, 76, & 77 codes are apparently egr and o2 related?
If yes, look before the o2 sensor, like an idle/air control or possibly even before the air enters the intake system. Also check the operating temperature of the coolant sensor. The reason for this check is that letting off the gas will slow the coolant level allowing it to climb a little bit higher causing the cylinder to burn hotter causing more fuel to be input into the combustion chamber. The sensor might be border line. The temperature sensor I am speaking of is the temp sending unit to the computer.
