Rick's Free Auto Repair Advice

Posts Tagged: obdII

P0137

Fix code P0137 Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 1). This sensor is located on the engine bank that houses #1 cylinder and is located AFTER the catalytic converter The PCM sends a reference voltage (usually 5-volts) to the variable resistor in the oxygen sensor and looks for a return voltage. Once the sensor is heated up, the PCM expects to see a varying voltage. If the PCM sees a constant low voltage, it will set a trouble code P0137. Most common causes are: vacuum leak that’s allowing … Read More

P0451 Evaporative Emission Control System

Fix code P0451 Evaporative Emission Control System Pressure Sensor Range/Performance Evaporative emissions systems test for a leak in the fuel tank and associated hoses. To perform the test, the computer pulls a vacuum and checks to see if the vacuum holds. Each car maker uses a different technique to check, but most often it’s some type of fuel tank pressure sensor. This codes relates to a failure in that sensor. It’s either reporting an incorrect value, or is malfunctioning. © 2012 Rick Muscoplat

P0125

Fix code P0125 Insufficient Coolant Temperature For Closed Loop Fuel Control When you start a cold engine, the computer runs off of factory programming and ignores input from the sensors. This is called Open Loop. As the engine warms up to operating temperature, the computer switches to Closed Loop, where it computes air/fuel mixtures based on actual engine conditions. When you get this code, it can mean you have a bad thermostat or low coolant(engine not heating up to operating temp), or a bad engine coolant temperature sensor. See the … Read More

P0125 Fix

P0125 Fix Insufficient Coolant Temperature For Closed Loop Fuel Control You need to determine whether the engine coolant temperature sensor is telling the truth and the engine really isn’t coming up to operating temperature, or whether the sensor is bad. Many DIYers rush to replace the sensor. And yes, they do go bad. But not nearly as often as the thermostat. So start your diagnostics by checking coolant level. If it’s low, fill it. Then, using an infra-red thermometer, check the temp around the thermostat housing. At operating temperature, it … Read More

P0507 Nissan Altima

Fix code P0507 Nissan Altima The computer sets P0507 Nissan Altima code when it sees an idle speed 200 RPM or more above the commanded RPM set by the computer. The symptom may appear as a high idle or a surging idle. That can occur right after someone cleans the throttle body. This procedure applies to 2002-2005 Nissan Alimas. This system eliminates the traditional throttle cable that used to run from the accelerator pedal to the throttle body. Instead, it uses and electronic accelerator pedal that sends a varying signal … Read More

P2123

Fix code P2123 Accelerator Position Sensor (APS #1 SUB) Circuit High Voltage Hyundai Specific This is a Hyundai specific P2123 trouble code. The engine computer has detected a problem with the Accelerator Position Sensor (APS #1 SUB) Circuit High Voltage © 2012 Rick Muscoplat

P2122

Fix code P2122 Accelerator Position Sensor (APS #1 SUB) Circuit Low Voltage Hyundai specific This is a Hyundai specific P2122 code. The engine computer has detected a problem with the Accelerator Position Sensor (APS #1 SUB) Circuit Low Voltage © 2012 Rick Muscoplat

P2135

Fix code P2135 Throttle Position Sensor (TPS) Property Malfunction For more information on this repair or any others for your vehicle, buy an online subscription to either Alldatadiy.com or eautorepair.net. Click on this link to compare the two services: Compare Alldata and Eautorepair. © 2012 Rick Muscoplat


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