Replacement of the incorrect oxygen sensor is also a possibility. Also sometimes there is a pcm reflash for the pro. Many of these sensors share a common ground point. Depending on the vehicle, this voltage threshold may be different, so check your repair manual to be sure. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. I am not sure what to do next, other than wait a while for the spring to come and take a longer ride.
What causes the P0138 code? So I think this is it, P0138. If it's normal, you have an intermittent problem that isn't currently acting up. What is repair and tune up history? You will not be able to know the exact cause until you check these areas of the exhaust system. The downstream should be 0. These inconsistent readings are often the reason to believe the circuit is losing voltage or ground into the O2 Sensor circuit. The O2 sensor looks fine mechanically. The Engine Control Module adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric.
P0138 Explained The job of the rear oxygen sensor is to monitor the performance of the catalytic converter. It might be the O2 sensor. For optimum catalyst operation, the air fuel mixture air-fuel ratio must be maintained near the ideal stoichiometric ratio. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. If you are not comfortable diagnosing and repairing your car, please take it to a Lexus service center. How does a mechanic diagnose the P0138 code? Lack of engine lubrication can shave years and thousands of miles from the life of an engine.
When the intake air volume is low the temperature of the exhaust gas is low , current flows to the heater in order to heat the sensor for the accurate oxygen concentration detection. Once the oxygen sensor stops performing as intended, the vehicle computer detects that and turns on the Check Engine light. Check wiring harness for melted wires especially near hot exhaust parts. The air-fuel ratio in your Lexus must be maintained near the ideal stoichiometric ratio of 14. Other Causes Another cause could be a damaged or clogged catalytic converter. After all, I was able to read the inverter water pump code P0A93.
It has been a while, the weather is now better, but still not very warm, about 5Celsius. If there is too little oxygen in the exhaust and your sensor detects a voltage level above 0. 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 the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. Since this code means high signal voltage from post cat. All these symptoms should prompt you to want to investigate the problem further.
As a result, the powertrain will generate trouble code P0138. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The only way to set this code is to have a break in the sensor's ground wire or the signal voltage wire is shorted to the 12 volt heater wire for that sensor. From there, we can provide an accurate cost estimate for the repair. It might be the O2 sensor.
I plan to replace it myself as shown. I need to document some more and move the discussion anyway. The Engine Computer will respond by adding more fuel but there will still be that extra oxygen there. Now I am getting really worried! A lot of snow and temps even as low as -10F. Here the winter was an unusually tough one. So, where should I look first? If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. Want the best online repair manual? That will help you narrow down the location of the problem.
I am reluctant to go to the dealer, since they will charge a lot only to look at me. If the catalyst is the problem, replace the catalytic converter. Inspect all areas of the engine compartment and underneath the car for wiring damage. Need help with a P0138 code? The Engine Control Module adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. That sounds loke a great idea ill let you know friday late afternoon.
As you can see, the list goes on and on. The oxygen sensors in your Lexus. My long thin arm was very useful. Now, is this serious, what happens if I drive it like this!? Definition The O2 Oxygen Sensor Circuit High Voltage Bank 1, Sensor 2 is normally located in the catalytic converter, before the muffler, in the exhaust system. Have questions about a or need to? It's probably related to some Oxygen sensor.