P1100
MAF Intermittant (Mazda)
P1101
MAF Out Of Range (Mazda)
P1106
Manifold Absolute Pressure (MAP) sensor circuit intermittent high voltage
P1107
Manifold Absolute Pressure (MAP) sensor circuit intermittent low voltage
P1108
BARO to MAP signal circuit comparison too high
P1111
Intake Air Temperature (IAT) sensor intermittent high voltage
P1112
Intake Air Temperature (IAT) sensor intermittent low voltage
P1114
Engine Coolant Temperature (ECT) sensor circuit intermittent low voltage
P1115
Engine Coolant Temperature (ECT) sensor circuit intermittent high voltage
P1115
Intake Air Temperature 2 Circuit High Input (Ford)
P1116
ECT Sensor Out Of Range (Mazda)
P1116
ECT Sensor Out Of Range (Ford)
P1117
ECT Intermittent (Mazda)
P1117
ECT Intermittent (Ford)
P1120
TPS Out Of Range Low (Mazda)
P1120
TPS Out Of Range Low (Ford)
P1121
Throttle Position (TP) Sensor Inconsistent With MAF Sensor High Voltage
P1122
Throttle Position (TP) Sensor Inconsistent With MAF Sensor Low Voltage
P1124
TPS Out Of Self Teat Range (Mazda)
P1124
TPS Out Of Self Teat Range (Ford)
P1125
TPS Intermittant (Mazda)
P1125
TPS Intermittant (Ford)
P1127
Exhaust Not Warm Enough, Downstream Sensor Not Tested (Ford)
P1128
MAP Lower Than Expected (Acura)
P1129
Upstream O2 Sensors Swapped Bank To Bank (HO2S-11-21) (Ford)
P1129
MAP Higher Than Expected (Acura)
P1129
Downstream O2 Sensors Swapped Bank To Bank (HO2S-12-22) (Ford)
P1130
Heated O2 Sensor (HO2S) 11 At Adaptive Limit (Mazda)
P1130
Lack Of HO2S-11, Fuel Trim At Limit (Ford)
P1131
HO2S 11 Indicates Lean (Mazda)
P1131
HO2S 11 Indicates Lean (Ford)
P1132
HO2S 11 Indicates Rich (Mazda)
P1132
HO2S 11 Indicates Rich (Ford)
P1133
Heated Oxygen Sensor (HO2S) insufficient switching bank 1 sensor 1 (Rear Bank)
P1134
Heated Oxygen Sensor (HO2S) transition time ratio bank 1 sensor 1 (Rear Bank)
P1137
Lack Of HO2S-12 Switch Indicates Lean (Ford)
P1138
Lack Of HO2S-12 Switch Indicates Rich (Ford)
P1150
Lack Of HO2S-21 Switch Fuel Trim At Limit (Ford)
P1151
Lack Of HO2S-21 Switch Indicates Lean (Ford)
P1152
Lack Of HO2S-21 Switch Indicates Rich (Ford)
P1153
Heated Oxygen Sensor (HO2S) insufficient switching bank 2 sensor 1 (Front Bank)
P1154
Heated Oxygen Sensor (HO2S) transition time ratio bank 2 sensor 1 (Front Bank)
P1157
Lack Of HO2S-22 Switch Indicates Lean (Ford)
P1158
Lack Of HO2S-22 Switch Indicates Rich (Ford)
P1168
FRP Sensor In Range But Low (Ford)
P1169
FRP Sensor In Range But High (Ford)
P1180
Fuel Delivery System Low (Ford)
P1181
Fuel Delivery System High (Ford)
P1183
EOT Sensor Circuit Malfunction (Ford)
P1184
EOT Sensor Out Of Range (Ford)
P1189
Engine Oil Pressure Switch Circuit
P1192
Inlet Air Temp. Circuit Low (Chrysler)
P1193
Inlet Air Temp. Circuit High (Chrysler)
P1195
1/1 O2 Sensor Slow During Catalyst Monitor (Chrysler)
P1196
2/1 O2 Sensor Slow During Catalyst Monitor (Chrysler)
P1197
1/2 O2 Sensor Slow During Catalyst Monitor (Chrysler)
P1198
Radiator Temperature Sensor Volts Too High (Chrysler)
P1199
Radiator Temperature Sensor Volts Too Low (Chrysler)
Catalyst System Efficiency Below Threshold (Bank 1)
Description:
How does a P0420 code trigger the check engine light? This code will trigger the check engine light as follows:
1996-newer (OBD-II) vehicles use oxygen sensors and a catalytic converter to reduce emissions. There is one O2 (oxygen) sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.
Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter
Diagnostic Help:
To diagnose a P0420 trouble code we begin by checking for exhaust leaks under the vehicle. Then use an oscilliscope to check the waveforms of both upstream and downstream O2 sensors. The front reading should vary, the rear should be steady. Replace as necessary. Check the rear Heated O2 Sensor. Check the catalytic converter, replace if necessary. If necessary, check for wiring and component concerns. See our article “Automotive Circuit Testing 101”, if you need more assistance with this. Remember to refer to an model-specific repair manual for proper instruction.
System Too Lean – Bank 1
Description:
How does a P0171 code trigger the check engine light? This code will trigger the check engine light as follows:
The adaptive fuel strategy in the vehicle’s computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Control Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running. Please refer to our article Oxygen Sensor Code Diagnosis for more info on this system. A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.
Possible Causes:
Refer to our Oxygen Sensor Code Diagnosis article for a list of all possible causes. The following is an overview of P0171 check engine light code possible causes.
Fuel System:
Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)
Air Intake System
Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter
Exhaust System
Any exhaust leak before or near the oxygen sensors
EGR System
Vacuum line disconnected from EGR System Module (ESM)
EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking
Secondary Air Injection System
Mechanically stuck secondary air injection valve
HO2S Heater Resistance (Bank 2, Sensor 3)
Description:
How does a P0061 code trigger the check engine light? This code will trigger the check engine light as follows:
The vehicle Powertrain Control Module monitors the oxygen sensor heater control circuit current draw. The check engine light will illuminate when the current requirements are too high or too low.
Possible Causes:
Possible causes for this check engine light code include:
Blown oxygen sensor fuse
Open circuit in oxygen sensor harness
Open circuit internal to oxygen sensor
Open circuit in PCM
Short circuit in oxygen sensor harness
Short circuit internal to oxygen sensor
Short circuit internal to PCM
Diagnostic Help:
To diagnose a P0061 check engine light code we will need to test out the oxygen sensor wiring and also test the circuits through the oxygen sensor itself. The internal processor circuits are a possible cause but are much less likely, so the other areas are thoroughly tested first. See our article Automotive Circuit Testing 101, if you need more assistance with this. If concern is determined to be intermittent, check out our article on Intermittent Diagnosis and wiggle test connectors and wiring, attempting to duplicate concern. You may also use the “Get Help” link if you need specifications or have any other related questions. Remember to refer to an appropriate manual for specific instruction.
HO2S Heater Resistance (Bank 2, Sensor 2)
Description:
How does a P0060 code trigger the check engine light? This code will trigger the check engine light as follows:
The vehicle Powertrain Control Module monitors the oxygen sensor heater control circuit current draw. The check engine light will illuminate when the current requirements are too high or too low.
Possible Causes:
Possible causes for this check engine light code include:
Blown oxygen sensor fuse
Open circuit in oxygen sensor harness
Open circuit internal to oxygen sensor
Open circuit in PCM
Short circuit in oxygen sensor harness
Short circuit internal to oxygen sensor
Short circuit internal to PCM
Diagnostic Help:
To diagnose a P0060 check engine light code we will need to test out the oxygen sensor wiring and also test the circuits through the oxygen sensor itself. The internal processor circuits are a possible cause but are much less likely, so the other areas are thoroughly tested first. See our article Automotive Circuit Testing 101, if you need more assistance with this. If concern is determined to be intermittent, check out our article on Intermittent Diagnosis and wiggle test connectors and wiring, attempting to duplicate concern. You may also use the “Get Help” link if you need specifications or have any other related questions. Remember to refer to an appropriate manual for specific instruction.
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