It tells the computer if the fuel mixture is burning rich less oxygen or lean more oxygen. Unfortunately, this is a pretty common code that stands for oxygen sensor voltage low. He took the 2008 Nissan Altima out into the woods to do some four wheeling. I have seen factory wiring and connectors give a voltage problem. This happens because the flip-flopping of the fuel mixture is slowed down which reduces converter efficiency.
Also, if not addressed properly and in a timely manner, it can cause serious damage to catalytic converter, which can be quite expensive to fix. Unheated 1 or 2 wire wire O2 sensors on 1976 through early 1990s vehicles can be replaced every 30,000 to 50,000 miles. The constant adjustment is what gives the O2 sensorsignal the switching appearance sine wave on the scope screen. The light should remain off until the engine is started. Theory of Operation The O2 sensor measures the oxygen content of the exhaust.
But what caused the vehicle to return two days later with the same code? In situations like this, plug a new sensor into the harness only. I recommend using a new sensor here. With the wire being grounded, the O 2 sensor heater circuit came on as soon as the ignition switch was turned on. One quick test is to disconnect the computer from the circuit. Inside the bulb are two strips of platinum that serve as electrodes or contacts. It is always a good idea to take your car for repairs whenever the check engine light comes on.
Before replacing, we suggest that you clean and service the oxygen sensor and inspect the as well. Bank 2, sensor 1 and the bank 2, sensor 2 O2's are in the same positions except they are on bank 2 of the engine. This sensor is made of ceramic zirconia. Using the old harness will help eliminate the possibility of tapping into the wrong circuit, a potentially costly mistake. Under normal conditions the heated oxygen sensor 3 is not used for engine control operation. Does the P0137 Code Need Serious Attention? Common Symptoms Check Engine light is the most obvious symptom for Error Code P0157.
How serious is the P0131 code? That's why some vehicles mostly imports have a sensor maintenance reminder light. Usually heater problems have codes associated with them, too. Sensor Diagnosis O2 sensors are amazingly rugged considering the operating environment they live in. An oxygen sensor will typically generate up to about 0. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. And if the converter overheats because of the rich mixture, it may suffer damage.
And it should never read 0 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. Also, check if the wiring is proper and there is no broken connection. The oxygen sensor must be hot about 600 degrees or higher before it will start to generate a voltage signal, so many oxygen sensors have a small heating element inside to help them reach operating temperature more quickly. One of the technicians brought up an interesting question: With the control wire being shorted to ground, why did the computer set a code for an open heater circuit? Creating a lean mixture by opening a vacuum line should cause the sensor's output to drop to its minimum 0. Some computer systems will shut the O 2 heater circuit off until the codes are cleared. The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust as the exhaust exits the engine.
Notice the reading after connecting the jumper wire and monitor if the reading improves. If the voltage is close to zero on the positive heater wire, then locate the open circuit in the power wire back to the fuse. The same holds true for Chrysler, but these use a different O2 bias voltage, which is usually 2. Check for Ground Wiring A lot of mechanics have reported that the P0132 code exists due to a bad ground wiring. A one cycle per second will make the scope trace go across the 0. The catalytic converter works to maintain the stoichiometric air-fuel ratio 14.
Using Simple Tools to Diagnose O2 Sensors I accomplished the same goals and retrieve the needed information with my extremely simple generic brand automotive scan tool. Engine running lean could also register lean codes such as P0171 and P0174. The ensures that the battery charge does not deplete while carrying on the diagnostic process. This exhaust gas sensor never stops moving. The list of automotive Makes at the right edge of the screen. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Remember, the engine needs to be running at this point.
If that is the case, you can check the ground voltage by connecting one end of the jumper cable to ground and another end to the negative terminal of the battery. Heated 3 and 4-wire O2 sensors on mid-1980s through mid-1990s applications can be changed every 60,000 miles. A heated o2 sensor is capable of switching between 0. Feel free to call me with any questions at the. An engine that is running lean could set this code, but usually there will be lean codes P0171 Land Rover, P0174 Land Rover present. To find out more about this, check our.
After careful interrogation of the young driver he told the true story. If possible use a graphing multi-meter to analyze the O2 sensor data to determine any possible problems. The 450 mV value is called a bias voltage and it is not the same for all manufacturers. If the light comes on again, locate the short-to-voltage in the wiring harness with the relay removed. It should be at 40 psi. While reading the scan values, goose the throttle and observe for O2 sensor minimum and maximum values 0. A good O2 sensor should produce an oscillating waveform at idle that makes voltage transitions from near minimum 0.