ratio

EOBD Fault codes P1100 – P1199

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)

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EOBD fault codes P0700-P0799

P0700

Transmission Control System Malfunction

P0701

Transmission Control System Range/Performance

P0702

Transmission Control System Electrical

P0703

Torque Converter/Brake Switch B Circuit Malfunction

P0704

Clutch Switch Input Circuit Malfunction

P0705

Transmission Range Sensor Circuit Malfunction (PRNDL Input)

P0706

Transmission Range Sensor Circuit Range/Performance

P0707

Transmission Range Sensor Circuit Low Input

P0708

Transmission Range Sensor Circuit High Input

P0709

Transmission Range Sensor Circuit Intermittent

P0710

Transmission Fluid Temperature Sensor Circuit Malfunction

P0711

Transmission Fluid Temperature Sensor Circuit Range/Performance

P0712

Transmission Fluid Temperature Sensor Circuit Low Input

P0713

Transmission Fluid Temperature Sensor Circuit High Input

P0714

Transmission Fluid Temperature Sensor Circuit Intermittent

P0715

Input/Turbine Speed Sensor Circuit Malfunction

P0716

Input/Turbine Speed Sensor Circuit Range/Performance

P0717

Input/Turbine Speed Sensor Circuit No Signal

P0718

Input/Turbine Speed Sensor Circuit Intermittent

P0719

Torque Converter/Brake Switch B Circuit Low

P0720

Output Speed Sensor Circuit Malfunction

P0721

Output Speed Sensor Circuit Range/Performance

P0722

Output Speed Sensor Circuit No Signal

P0723

Output Speed Sensor Circuit Intermittent

P0724

Torque Converter/Brake Switch B Circuit High

P0725

Engine Speed Input Circuit Malfunction

P0726

Engine Speed Input Circuit Range/Performance

P0727

Engine Speed Input Circuit No Signal

P0728

Engine Speed Input Circuit Intermittent

P0730

Incorrect Gear Ratio

P0731

Gear 1 Incorrect Ratio

P0732

Gear 2 Incorrect Ratio

P0733

Gear 3 Incorrect Ratio

P0734

Gear 4 Incorrect Ratio

P0735

Gear 5 Incorrect Ratio

P0736

Reverse Incorrect Ratio

P0740

Torque Converter Clutch Circuit Malfunction

P0741

Torque Converter Clutch Circuit Performance or Stuck Off

P0742

Torque Converter Clutch Circuit Stuck On

P0743

Torque Converter Clutch Circuit Electrical

P0744

Torque Converter Clutch Circuit Intermittent

P0745

Pressure Control Solenoid Malfunction

P0746

Pressure Control Solenoid Performance or Stuck Off

P0747

Pressure Control Solenoid Stuck On

P0748

Pressure Control Solenoid Electrical

P0749

Pressure Control Solenoid Intermittent

P0750

Shift Solenoid A Malfunction

P0751

Shift Solenoid A Performance or Stuck Off

P0752

Shift Solenoid A Stuck On

P0753

Shift Solenoid A Electrical

P0754

Shift Solenoid A Intermittent

P0755

Shift Solenoid B Malfunction

P0756

Shift Solenoid B Performance or Stuck Off

P0757

Shift Solenoid B Stuck On

P0758

Shift Solenoid B Electrical

P0759

Shift Solenoid B Intermittent

P0760

Shift Solenoid C Malfunction

P0761

Shift Solenoid C Performance or Stuck Off

P0762

Shift Solenoid C Stuck On

P0763

Shift Solenoid C Electrical

P0764

Shift Solenoid C Intermittent

P0765

Shift Solenoid D Malfunction

P0766

Shift Solenoid D Performance or Stuck Off

P0767

Shift Solenoid D Stuck On

P0768

Shift Solenoid D Electrical

P0769

Shift Solenoid D Intermittent

P0770

Shift Solenoid E Malfunction

P0771

Shift Solenoid E Performance or Stuck Off

P0772

Shift Solenoid E Stuck On

P0773

Shift Solenoid E Electrical

P0774

Shift Solenoid E Intermittent

P0775

Pressure Control Solenoid “B”

P0776

Pressure Control Solenoid “B” Performance or Stuck off

P0777

Pressure Control Solenoid “B” Stuck On

P0778

Pressure Control Solenoid “B” Electrical

P0779

Pressure Control Solenoid “B” Intermittent

P0780

Shift Malfunction

P0781

1-2 Shift Malfunction

P0782

2-3 Shift Malfunction

P0783

3-4 Shift Malfunction

P0784

4-5 Shift Malfunction

P0785

Shift/Timing Solenoid Malfunction

P0786

Shift/Timing Solenoid Range/Performance

P0787

Shift/Timing Solenoid low

P0788

Shift/Timing Solenoid High

P0789

Shift/Timing Solenoid Intermittent

P0790

Normal/Performance Switch Circuit Malfunction

P0791

Intermediate Shaft Speed Sensor Circuit

P0792

Intermediate Shaft Speed Sensor Circuit Range/Performance

P0793

Intermediate Shaft Speed Sensor Circuit No signal

P0794

Intermediate Shaft Speed Sensor Circuit Intermittent

P0795

Pressure Control Solenoid “C”

P0796

Pressure Control Solenoid “C” Performance or Stuck off

P0797

Pressure Control Solenoid “C” Stuck On

P0798

Pressure Control Solenoid “C” Electrical

P0799

Pressure Control Solenoid “C” Intermittent

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Check Engine Light Code P0116

OBD II Code P0116
Engine Coolant Temperature Circuit Range/Performance Problem

Our emissions expert has put together the following information about the P0116 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.

OBD II Fault Code

OBD II P0116
Fault Code Definition
The Engine Coolant Temperature Sensor measures the rise and fall of the Engine Coolant Temperature. This provides critical data needed for the Powertrain Control Module (PCM) to control the Air Fuel Ratio, the Ignition Spark Timing, the cooling fans, and many components of the Emissions Control Systems. Code P0116 indicates a performance problem with the sensor signal to the Powertrain Control Module.

Symptoms

Check Engine Light will illuminate
In many cases, no abnormal symptoms may be noticed
In some cases, the engine may be hard starting and/or get poor fuel economy
Common Problems That Trigger the P0116 Code

Defective Engine Coolant Temperature Sensor
Rusty and/or corroded Engine Coolant
Faulty or corroded Engine Coolant Temperature wiring or connections

Common Misdiagnoses

Engine Coolant Temperature Sensor is replaced when the real cause is rusty coolant
Engine Coolant Temperature Sensor is replaced when the real cause is a poor connection or chafed wiring
Engine Coolant Temperature Sensor is replaced when the real problem is in the Cooling System

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Check Engine Light Code P0122

Throttle/Pedal Position Sensor/Switch “A” Circuit Low Input

Our emissions expert has put together the following information about the P0122 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.

OBD II Fault Code

OBD II P0122

Fault Code Definition
Code P0122 is triggered when the voltage output from the Throttle/Pedal Position Sensor/Switch to the PCM is too low.

The Throttle Position Sensor/Switch is located on the Throttle Body of the Intake Manifold and the Pedal Position Sensor/Switch is located on the Accelerator Pedal. These sensors provide precise input from the driver’s foot in terms of how much power is needed—and how urgently—from the engine.

As the Throttle Position Sensor is rotated from its base resting position to full acceleration, it sends a increasing voltage signal to the Powertrain Control Module (PCM). This decreasing or increasing voltage signal is used by the PCM to manage the Air Fuel Ratio and Spark Timing of the engine as well as other emissions system components.

Symptoms

Check Engine Light will illuminate
In many cases, no abnormal symptoms may be noticed
In some cases, the engine may be hard starting
In some cases, the engine may hesitate during acceleration
Common Problems That Trigger the P0122 Code

Defective Throttle Position Sensor or Switch
Torn or jammed floor mats
Faulty or corroded Throttle/Pedal Position Sensor/Switch wiring or connections
Common Misdiagnoses

Throttle or Pedal Position Sensor is replaced when the real problem is a poor connection or chafed wiring
Pedal Position Sensor is replaced when the real problem is torn or damaged floor mats

Possible Solutions

Some recommended troubleshooting and repair steps are:

Carefully check the throttle position sensor (TPS), wiring connector, and wiring for breaks, etc. Repair or replace as necessary
Check the voltage at the TPS (refer to a service manual for your vehicle for specific information). If the voltage is too low that is indicative of a problem. Replace if necessary.
If recently replaced the TPS may need to be adjusted. On some vehicles the installation instructions call for the TPS to be properly aligned or adjusted, consult a repair manual for specifics.
If there are no symptoms at all, the problem may be intermittent and clearing the code may resolve the issue temporarily. If this is the case then you should definitely check the wiring to be sure it’s not rubbing on anything, grounding, etc. The code may come back.
Other TPS sensor and circuit related DTCs: P0120, P0121, P0123, P0124

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Check Engine Light Code P0171

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

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