172-181

NOTE
KOEO refers to Key On Engine Off (KOEO)
KOER refers to Key On Engine Running (KOER)
DTC refers to Diagnostic Trouble Code (DTC)
DTCs should be diagnosed in the order they are received.



DTC 172
Lack of heated oxygen sensor switches indicates lean (bank # 1).

KOER Hard Code Go to H1
H1 - Check For Diluted Engine Oil

KOEO Memory Code Go to H1
H1 - Check For Diluted Engine Oil

DTC 173
Lack of heated oxygen sensor switches. Indicates rich (bank #1).

KOER Hard Code Go to H1
H1 - Check For Diluted Engine Oil

KOEO Memory Code Go to H1
H1 - Check For Diluted Engine Oil

DTC 174

KOEO Memory Code Go to H1
H1 - Check For Diluted Engine Oil

DTC 175
Fuel system at adaptive limits, heated oxygen sensor unable to switch (bank #2).

KOEO Memory Code Go to H1
H1 - Check For Diluted Engine Oil

DTC 176
Lack of heated oxygen sensor switches, indicates lean (bank #2).

KOEO Memory Code Go to H1
H1 - Check For Diluted Engine Oil

DTC 177
Lack of heated oxygen sensor switches, indicates rich (bank #2).

KOEO Memory Code Go to H1
H1 - Check For Diluted Engine Oil

DTC 178

KOEO Memory Code Go to H1
H1 - Check For Diluted Engine Oil

DTC 179
Fuel system at lean adaptive limit at part throttle, system rich (bank #1).

KOEO Memory Code Go to HA1
HA1 - Check For Other Codes

DTC 181
Fuel system at rich adaptive limit at part throttle, system lean (bank #1).

KOEO Memory Code Go to HA1
HA1 - Check For Other Codes