This particular sensor keeps track of the exhaust stream to see what the oxygen levels are. The team at Auto Lab is always here to help. The operation should be nearly the same, except sensor 2 should have a lower O2 reading since the catalyst should burn off the excess fuel and oxygen. What is repair and tune up history? Ho2S 2 signal is less active than signal produced by front oxygen sensor. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. Most heated oxygen sensors use a battery voltage approximately 12.
If the O2 Sensor signal ever goes to a negative voltage, or in excess of one volt, this is an indication that the sensor is bad. However, if the voltage output of the sensor is not under 1. What are the common causes of code P0138? Enter the 5 character trouble codes in the search box and submit the search. The list of automotive Makes at the right edge of the screen. . What repairs can fix the P0138 code? The leak detection pump is part of the evaporative emissions system. Manufacturers constantly strive to build their vehicles to meet tougher emission standards each year.
How do you troubleshoot code P0138? The system pulls a vacuum on the fuel system and holds it for a period of time. There could be stronger and thicker exhaust fumes coming out of the tailpipe too. But one of the main causes of cat codes is bad tune up or engine miss or running rich. From the heater positive to both sides of the sensor circuit should measure over 10 kΩ. The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine.
This sensor may be defective from corrosion, but there could also be defective wiring, high fuel pressure, faulty oxygen sensor connection, or a short. If there is too little oxygen in the exhaust and your O2 Sensor detects a voltage level below 0. This causes the ignition coil to provide a spark and the injector to inject fuel into each cylinder at the right time. What are the symptoms of the P0138 code? Water entry and corrosion are common faults. For optimum catalyst operation, the air-fuel mixture air-fuel ratio must be maintained near the ideal stoichiometric ratio. Scanner programs and tools vary in price. Modern vehicles have in them, also known as O2 sensors.
All these symptoms should prompt you to want to investigate the problem further. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set. The Engine Control Module adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The oxygen sensor measures the amount of oxygen present.
Simply connect the scanning tool or a computer with scanning software downloaded to the connector located under the steering wheel and the readout will show you Diagnostic Trouble Codes that might be affecting your car. What are the symptoms of code P0138? Check the oxygen sensors for damage. In most cases, excessive fuel that is not burned by the engine is initially deposited in the intake and cylinder heads. If your are for a different car, select that vehicle series before searching for the diagnostic codes because not all used by one manufacture are used by the other makes. If you know where the sensor is, you only have to unclip the old sensor and replace it with a new one. Indicator and headlight bulbs need regular maintenance for them to keep functioning properly. The O2 Oxygen Sensor Circuit High Voltage Bank 1, Sensor 2 can usually be found within the catalytic converter.
Since I have otherwise had no other problems, and no other codes present how likely is it to be just a faulty O2 sensor? The oxygen sensor measures the amount of oxygen present. Steering: Purpose is to direct vehicle in the required direction. It consists of master cylinder, brake booster vacuum or hydraulic , calipers, drums, pads and rotors. It consists of a slip yoke, shaft and universal joints. The information contained on this site is presented for informational purposes only. You are checking for ground and signal reference.
Power storage: Stores unused power to start the car and supply voltage to the alternator to create more electricity. If it is the cat bad they are under federal warranty for 80k or 8 years. Two types used are manual or automatic. How serious is the P0138 code? The oxygen sensors in your Lexus. The currently selected is for the Jeep makes. Variations of greater than 10-percent in either direction will result in a stored code and an illuminated malfunction indicator lamp.