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.

Recent Comments
  • RESET ENGINE OIL LIFE CADILLAC CT6 ON 2014-2017
    How to reset oil life for Cadillac CT6 from years 2016, 2017 To turning off the Oil Life Light on 2016, 2017 Cadillac CT6, conform to the following instructions: Press SEL button on the steering wheel Scroll to Info Pages and press SEL button Hit the Up/Down button until you see the “OIL LIFE REMAININGâ€� […]
  • RESET ENGINE OIL LIFE HYUNDAI VELOSTER ON 2014-2017
    How to reset oil life for Hyundai Veloster from years 2014, 2015, 2016, 2017 To turning off the Oil Life Light on 2014, 2015, 2016, 2017 Hyundai Veloster, conform to the following instructions: Turn the ignition to position On without starting the engine. Press and hold the TRIP button until you enter to “User Settingâ€� […]
  • RESETTING OIL CHANGE WARNING LIGHT FOR DACIA DUSTER 2009-2015
    How to reset oil change warning light for Dacia Duster from years 2009, 2010, 2011, 2012, 2013, 2014, 2015 To turning off the Oil Life Light on 2009, 2010, 2011, 2012, 2013, 2014, 2015 Dacia Duster, conform to the following instructions: Turn the ignition key to position “ONâ€� fully depress accelerator pedal and then depress […]
  • Service light reset dashboard BMW X5 and BMW X6
    How do you reset maintenance light, reset service light indicator BMW X5 and BMW X6, year 2000-2013. For reset maintenance light and that can be made manually by use button on car dashboard. Reset oil service light, engine oil life BMW X5 and BMW X6, year 2000-2013 oil reset instructions: Turn the ignition to the […]
  • Service light reset dashboard BMW with 20 pin connector
    How do you reset maintenance light, reset service light BMW with 20 pin connector. For reset maintenance light and that can be made manually by use button on car dashboard. Reset service light, engine oil life BMW with 20 pin connector, oil reset instructions: How to reset oil maintenance light on BMW with 20 pin […]