Contour L4-122 2.0L DOHC VIN 3 SFI (1995)
Code 171 - 180: Testing and Inspection
171
DTC 129
Insufficient manifold absolute pressure sensor or mass airflow sensor change during dynamic response test KOER.
DTCs should be diagnosed in the order they are received.
KOER Hard Code .................................................................................................................................................................................. Go to DC13
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DC - Mass Air Flow (MAF) Sensor/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
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/H - Fuel Control/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
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/H - Fuel Control/H1 - Check For Diluted
Engine Oil
DTC 139
No heated oxygen sensor switches detected (bank #2).
KOEO Memory Code ................................................................................................................................................................................. Go to H1
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/H - Fuel Control/H1 - Check For Diluted
Engine Oil
DTC 141
Fuel system indicates lean.
KOER Hard Code .................................................................................................................................................................................... Go to HB1
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/HB - Flexible Fuel (FF) Control/HB1 -
Check For Fuel Diluted Engine Oil
DTC 144
No heated oxygen sensor switches detected (bank #1).
KOEO Memory Code ................................................................................................................................................................................. Go to H1
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/H - Fuel Control/H1 - Check For Diluted
Engine Oil
DTC 157
Mass air flow sensor circuit below minimum voltage.
KOEO Memory Code ............................................................................................................................................................................. Go to DC10
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DC - Mass Air Flow (MAF) Sensor/DC10 -
Check For Intermittent Sensor
DTC 158
Mass air flow sensor circuit above maximum voltage.
KOEO Hard Code .................................................................................................................................................................................. Go to DC22
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DC - Mass Air Flow (MAF) Sensor/DC22 -
Rerun Self-Test W/MAF Sensor Disconnected
KOEO Memory Code ............................................................................................................................................................................. Go to DC22
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DC - Mass Air Flow (MAF) Sensor/DC22 -
Rerun Self-Test W/MAF Sensor Disconnected
DTC 159
Mass air flow sensor signal higher or lower than expected.
