129-171
NOTEKOEO 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 129
Insufficient manifold absolute pressure sensor or mass airflow sensor change during dynamic response test KOER.
KOER Hard Code Go to DC13
DC13 - Air Leak at MAF Sensor
DTC 136
Lack of heated oxygen sensor switch during KOER self-test, indicates lean (Bank #2).
KOER Hard Code Go to H1
H1 - Check For Diluted Engine Oil
DTC 137
Lack of heated oxygen sensor switch during KOER self-test, indicates rich (Bank #2).
KOER Hard Code Go to H1
H1 - Check For Diluted Engine Oil
DTC 139
No heated oxygen sensor switches detected (bank #2).
KOEO Memory Code Go to H1
H1 - Check For Diluted Engine Oil
DTC 141
Fuel system indicates lean.
KOER Hard Code Go to HB1
HB1 - Check For Fuel Diluted Engine Oil
DTC 144
No heated oxygen sensor switches detected (bank #1).
KOEO Memory Code Go to H1
H1 - Check For Diluted Engine Oil
DTC 157
Mass air flow sensor circuit below minimum voltage.
KOEO Memory Code Go to DC10
DC10 - Check For Intermittent Sensor
DTC 158
Mass air flow sensor circuit above maximum voltage.
KOEO Hard Code Go to DC21
DC21 - Rerun Self-Test W/MAF Sensor Disconnected
KOEO Memory Code Go to DC21
DC21 - Rerun Self-Test W/MAF Sensor Disconnected
DTC 159
Mass air flow sensor signal higher or lower than expected.
KOEO Hard Code Go to DC1
DC - Mass Air Flow (MAF) Sensor
KOER Hard Code Go to DC1
DC - Mass Air Flow (MAF) Sensor
DTC 167
Insufficient throttle position change during dynamic response test KOER.
KOER Hard Code Go to DH20
DC20 - Check MAF Circuit Output
DTC 171
Fuel system at adaptive limits, heated oxygen sensor unable to switch (Bank #1)
KOEO Memory Code Go to H1
H1 - Check For Diluted Engine Oil