What does the code p0138 mean on the O2 sensor?
What the P0138 code means. P0138 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 fails to have a lower voltage output below 1.2 volts for more than 10 seconds indicating a lack of oxygen in the exhaust stream.
What does p0138 mean on a Jeep Wrangler?
Users have reported P0138 for the following makes: Jeep (especially on a Jeep Wrangler), Dodge, Toyota, Nissan, and Chevrolet. Code P0138 means that your powertrain control module (PCM) has detected that the voltage signal from the rear O2 sensor is too high. What is an Oxygen Sensor? All modern cars have at least two oxygen sensors.
What is the OBD code for bank 1 sensor 2?
P0138 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 fails to have a lower voltage output below 1.2 volts for more than 10 seconds indicating a lack of oxygen in the exhaust stream.
What does error code p0138 on Lexus IS mean?
Lexus: What Does Error Code P0138 Mean? P0138 is the OBD-II generic code indicating that the O2 sensor for bank 1 sensor 2 fails to have a lower voltage output below 1.2 volts for more than 10 seconds indicating a lack of oxygen in the exhaust stream. This article applies to the Lexus IS, RX, GS, LS, and ES (2005-Present).
What causes engine code p0138?
The P0138 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor signal voltage remains excessively high for an extended period of time. Possible Symptoms Engine Light ON (or Service Engine Soon Warning Light)
Where is the bank 1 sensor 1 oxygen sensor located?
Bank one is the engine cylinder bank near the engine firewall (see diagram). The bank one sensor one is the Oxygen sensor (O2) located in the exhaust pipe just of the engine cylinder bank at rear and before the Catalytic Converters .
What does Bank 2 sensor 2 oxygen sensor do?
O2 sensors on a specific bank marked as “sensor 2” (as this one is) are used to monitor emissions. A Three-Way Catalyst (TWC) system (catalytic converter) is used to control tailpipe emissions. The PCM uses the signal received from Oxygen sensor 2 (#2 indicates aft of catalytic converter, #1 indicates pre-converter)…
Which sensor is Bank 1 sensor 1?
Bank 1 Sensor 1 is a sensor that is used by the computer (ECM) to monitor the amount of oxygen exiting the engine. The ECM uses the signal from the O2 sensor to adjust the fuel and air ratio of the engine.
When to replace Bank 1 downstream O2 sensor?
If the O2 sensor is reading high voltage and the fuel pressure and coolant temperature are within spec, replace the bank 1 downstream O2 sensor. For error code P0138, one or more of the below repairs may be needed to solve the underlying issue.
What is the cause of the code p0138?
What Is the Cause of Code P0138? 1 Faulty O2 Sensor 2 Short to battery voltage in O2 sensor signal circuit 3 Corroded wiring 4 Fuel pressure too high 5 Engine coolant temperature sensor
If the O2 sensor is reading high voltage and the fuel pressure and coolant temperature are within spec, replace the bank 1 downstream O2 sensor. For error code P0138, one or more of the below repairs may be needed to solve the underlying issue.
When to replace the O2 sensor in a car?
Check voltage at the O2 sensor; if the voltage is steadily high (.9V or higher) the O2 sensor may be faulty. Before replacing, check the following: If the O2 sensor is reading high voltage and the fuel pressure and coolant temperature are within spec, replace the bank 1 downstream O2 sensor.
Which is the first sensor in the PCM?
The first sensor (or Sensor 1) is the upstream oxygen sensor that aids the PCM in regulating the vehicle’s air/fuel ratio. Sensor 2, also known as the downstream oxygen sensor, monitors the catalytic converter to check its performance.
What causes a P0158 sensor circuit high voltage?
Potential causes of an P0158 code include: 1 Bad o2 sensor (Bank 2 Sensor 2). 2 Wiring in contact with exhaust components. 3 Engine running rich (If other codes are present). 4 Holes in exhaust causing PCM to over-rich engine resulting in an abnormally high Bank 2, sensor 2 reading. 5 Short to voltage on signal circuit. 6 (more items)
What causes the p1320 sensor to be set?
Factors like abnormal electrical resistances in wiring, crankshaft position sensor, ignition coil power transistors, or even the ignition coil itself can cause code P1320 to set, or contribute to its setting, which will cause a warning light to be illuminated. Where is the P1320 sensor located?
What are the symptoms of a P0158 DTC?
Symptoms of a P0158 DTC may include: MIL (Malfunction Indicator Lamp) on Engine loses power and misses intermittently May exhibit loss of fuel efficiency Potential causes of an P0158 code include: Wiring in contact with exhaust components Engine running rich (If other codes are present)
Factors like abnormal electrical resistances in wiring, crankshaft position sensor, ignition coil power transistors, or even the ignition coil itself can cause code P1320 to set, or contribute to its setting, which will cause a warning light to be illuminated. Where is the P1320 sensor located?
Symptoms of a P0158 DTC may include: MIL (Malfunction Indicator Lamp) on Engine loses power and misses intermittently May exhibit loss of fuel efficiency Potential causes of an P0158 code include: Wiring in contact with exhaust components Engine running rich (If other codes are present)
When does the O2 sensor turn on the Check Engine light?
The engine control module (ECM) sees the voltage of the O2 sensor for bank 1 sensor 2 above 1.2 volts when the ECM has commanded the fuel to a targeted lean condition on that bank of the engine. The ECM detects the voltage high problem and turns on the Check Engine Light.
What causes the p0138 code on an engine?
What causes the P0138 code? 1 The engine control module (ECM) sees the voltage of the O2 sensor for bank 1 sensor 2 above 1.2 volts… 2 The ECM detects the voltage high problem and turns on the Check Engine Light. 3 The ECM uses other O2 sensors to try and control the fuel injection with their values.
P0138 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 fails to have a lower voltage output below 1.2 volts for more than 10 seconds indicating a lack of oxygen in the exhaust stream.
The engine control module (ECM) sees the voltage of the O2 sensor for bank 1 sensor 2 above 1.2 volts when the ECM has commanded the fuel to a targeted lean condition on that bank of the engine. The ECM detects the voltage high problem and turns on the Check Engine Light.
What is the code for bank 1 O2 sensor?
All our repairs are backed by our 12-month / 12,000-mile warranty. P0138 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 fails to have a lower voltage output below 1.2 volts for more than 10 seconds indicating a lack of oxygen in the exhaust stream.
What is the diagnostic code for O2 sensor circuit high voltage?
P0138 is a diagnostic trouble code (DTC) for “O2 Sensor Circuit High Voltage (Bank 1, Sensor 2)”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
How to check for an O2 sensor failure?
Scans codes and documents freeze frame data and then clears codes to verify failure. Monitors O2 sensor data to see if the voltage is switching back and forth between low and high at a fast rate compared to other sensors. Checks the O2 sensor wiring and the harness connections for any corrosion in the connections.
Why is my O2 sensor still reading the same code?
If you have to drive 10 minutes before the Check Engine light comes on with the same code with the new O2 sensors, then the O2 sensor may be getting coated or contaminated where it can no longer read the oxygen content in the exhaust gasses and the voltage signal from the O2 sensor remains high.
What causes engine code p0138-oxygen sensor voltage?
Once the oxygen sensor stops performing as intended, the vehicle computer detects that and turns on the Check Engine light. This will usually have a diagnostic trouble code (DTC) of P0138. Typically, you’d take the vehicle into the shop, where they’d diagnose the issue and replace the oxygen sensor for you.
What does the DTC code p0138 stand for?
Diagnostic trouble code (DTC) P0138 stands for O2 Sensor Circuit High Voltage (Bank 1, Sensor 2). The code will set when your car’s primary computer—also called the powertrain control module (PCM)—detects that, for a given period of time, the voltage signal from the rear O2 sensor is too high.
When did Bank 1 O2 sensor stop working?
I have a 2002 Chrysler T&C limited. In September 2012, squirrels chewed through the wiring to my bank 1 O2 sensor. After a quick and easy fix, there were no issues or codes. In February 2013, three error codes popped up (P0134, 0138, 0139), and the car was running sluggish and getting poor gas mileage.
What the P0138 code means. P0138 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 fails to have a lower voltage output below 1.2 volts for more than 10 seconds indicating a lack of oxygen in the exhaust stream.
Users have reported P0138 for the following makes: Jeep (especially on a Jeep Wrangler), Dodge, Toyota, Nissan, and Chevrolet. Code P0138 means that your powertrain control module (PCM) has detected that the voltage signal from the rear O2 sensor is too high. What is an Oxygen Sensor? All modern cars have at least two oxygen sensors.
What are the p0607 and p0138 codes on a RAV4?
I only replaced the heated oxygen sensor (Bank 1 sensor 2) on my 2012 rav4 4cyl and I can confirm that replacing just that o2 sensor got rid of both codes (p0138 and p0607), at least for me. :smile If anything changes I will update. Click to expand… Thanks for posting that, should be useful to others down the road.
What does the code p0138 on a boxer engine mean?
Code P0138 is set when the downstream sensor sends too high of a voltage signal for an extended period of time. The bank one portion of the code indicates that the issue is on the side of the engine that houses the number one cylinder (only applies to engines with a ‘V’ or boxer configuration).