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If you’re getting error 0138 on your computer, it’s worth checking out these repair ideas. What the P0138 code means P0138 is a generic OBD-II code that indicates that the O2 sensor used to make sensor 2 bank 1 will not shut down when the output voltage is below 1.2 voltage for more than 10 seconds, indicating any type of fault oxygen in discharged electricity.
P0138 Code Definition
What Does P0138 Mean?
Oxygen sensor 2 is an oxygen sensor after the catalyst. It measures the amount of air and air discharged from the catalytic converter to ensure the safe operation of the catalytic converter. At high voltage (about 9 V), excess fuel is also present in the entire mixture. When the voltage drops (about 1 V), there is an excess of air in the mixture. Therefore, an oxygen sensor (sensor 2) connected exactly downstream should generate a constant voltage of about 0.45 voltage. If DTC P0138 is set, it could indicate a high voltage (consistently above 0.9 volts) for more than 10 seconds, indicating a lack of required oxygen in the exhaust stream and a large amount of fuel on the sensor. 2 its bank 1 engine.
What Are The Common Symptoms Of The P0138 Code?
- Check engine light.
- Powerful engine
- Reducing fuel consumption.
- Intermittent idling.
- Heavy smoke
What Is The Exact Reason For The P0138 Code?
- Faulty sensor
- O2 Short to Battery Voltage in O2 Sensor Warning Circuit
- Corroded wiring.
- Fuel pressure is too high.
- Engine Coolant Temperature Sensor
How Serious Is The P0138 Code? â € “Moderate”
It is normal to drive a P0138 vehicle for a short time, but prolonged driving with this code may damage one or more catalytic converters.
Code P0138 Common Diagnostic Errors
The number one simple repair for this problem is to replace the O2 sensor yourself. Another repair is to replace the wiring or connector of multiple units 1, sensor 2. If the switch is faulty, replace the catalytic air compressor. Replace the injector if it actually leaks.
Replacing the O2 sensor altogether without checking for rich due to some other problem.
Tools Needed To Diagnose The P0138 Code:
- Tools required for diagnostics:
- FIX
- Multimeter
- Fuel pressure gauge
How To Diagnose And Fix The P0138 Code:
- Make sure the wiring for O2 is not damaged by the sensor; if damaged, clean or replace the damaged wire harness.
- Check the voltage at this O2 sensor; If the voltage is stable and high (0.9 V or more), the O2 sensor may well be defective. Before replacing, check all coolant as follows:
- Make sure the temperature is sufficient (see the vehicle manual for specifications).
- Make sure the fuel pressure is almost certainly within specification.
- If the O2 sensor is scanning for high voltage and the fuel pressure and coolant temperature are within specification, replace the O2 sensor after block 1.
Estimated Cost Of Corresponding Repair
DTC P0138 may require one or more of the following repairs to resolve the underlying problem. For each possible repair, the estimated cost includes the cost of the items involved and the labor cost to assist with the repair.
- Oxygen sensor $ 200 to $ 300…
- Fuel Alert Regulator $ 200-400.
- Engine Coolant Temperature Gauge $ 150 to $ 200.
Is your car causing trouble code P0138 on your OBD-II scanner? If so, read on to find out what solutions this code means, what the symptoms and possible causes are, and how to diagnose and fix the problem.
Where Do You See The Value Of P0138?
Time code required for diagnostics ( DTC) P0138 is an O2 Circuit Sensor High Voltage (Bank 1 Sensor 2). The code is set when a person’s main computer – also known as Powertrain and Keep Control of Module (PCM) – detects that the voltage signal from our rear O2 sensor is too high for a period of time.
The Secondary Heated Oxygen Sensor (HO2S) (Sensor 2) detects the oxygen level in the exhaust after our proprietary Three Way Catalytic Converter (TWC) in the Air Ratio Feedback Control System Fuel / Stoichiometric data based on this air / fuel ratio … Sensor (a / f) (Sensor 1) generates voltage. Secondary regulators typically adjust the air / fuel ratio at the outlet of the A / F sensor to optimize TWC efficiency.
After the HO2S heater has been turned on, if the HO2S output continues to normally exceed the high limit used during closed loop control, a serious malfunction will be detected and a DTC will no doubt set.
For a detailed technical discussion of where the P0138 Downstream Oxygen sensor may be triggered, see the next section.
If you want to know the possible reasons for the code, click this type here .
How Some Kind Of Downstream Oxygen Sensor Can Trigger A Modern P0138
All vehicles are equipped with at least two oxygen sensors . Although both sensors monitor the amount of oxygen in the exhaust stream, the PCM uses the data provided by these types in different ways. The first sensor (or 1) is the upstream oxygen sensor; the fact that the sensor is the primary feedback input for the closed-loop fuel system and helps the PCM regulate the air-fuel ratio in the vehicle.
A low voltage signal indicates a poor atmospheric fuel mixture or too much oxygen and then too little fuel. The P0131 code is set when the signal voltage from the front O2 sensor goes down. In modern cars, yesAn air-fuel ratio (A / F) sensor is used in place of most O2 sensors, but it is also often referred to as a front O2 sensor.
Ok, let’s talk in more detail about sensor 2, which is also considered a downstream oxygen sensor. The main task of this sensor is to register the oxygen supply in the catalytic converter.
I don’t know many movements that for most instruments, if the upper (main) O2 sensor becomes so unreliable that the ECM / PCM usually knows it can no longer trust this signal, the lower O2 sensor, which usually monitors the oxygen storage capacity in your catalytic converter is likely to be the primary input for the ECM / PCM to reduce fuel consumption. Why? Because the algorithms written for the ECM / PCM prioritize the protection of our own catalytic converter, which is the most expensive emission component in any given system. Traditional
O2 sensor defective.Short to battery voltage in the O2 sensor signal circuit.Corroded wiring.The fuel pressure is there.Engine coolant temperature sensor.
The front zirconium oxide oxygen sensor generates a corresponding voltage signal that flows in and out continuously. The measured value gives the PCM an indication of the air-fuel mixture in the engine. A value greater than 0. A 45 volt indicates a too rich condition and a value less than 0. A 45 volt indicates a poor condition. The sensor / sensor at the input must switch very actively, even if the system is in “closed loop”, which means that the dateThe inlet chuck is routinely used for many fuel checks.
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If this particular catalyst and upstream sensor are working correctly, the downstream oxygen sensor will want to do so.
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