P0138 2009 Toyota Camry Code - Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2
Quick Answer
In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a TWC is used. Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, EFI Relay, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0138 2009 Toyota Camry indicates Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, EFI Relay, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0138 2009 Toyota Camry Description
The HO2 sensor is located behind the TWC, and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low). When the air-fuel ratio becomes lean, the oxygen concentration in the exhaust gas is rich. The HO2 sensor informs the ECM that the post-TWC air-fuel ratio is lean (low voltage, i.e. less than 0.45 V). Conversely, when the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration in the exhaust gas becomes lean. The HO2 sensor informs the ECM that the post-TWC air-fuel ratio is rich (high voltage, i.e. more than 0.45 V). The HO2 sensor has the property of changing its output voltage drastically when the air-fuel ratio is close to the stoichiometric level.
The ECM uses the supplementary information from the HO2 sensor to determine whether the air-fuel ratio after the TWC is rich or lean, and adjusts the fuel injection time accordingly. Thus, if the HO2 sensor is working improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air-fuel ratio control.
What are the Possible Causes of the DTC P0138 2009 Toyota Camry?
- Faulty Rear Heated Oxygen Sensor Bank 1
- EFI Relay
- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Intake air leaks
- Exhaust gas leaks
- Inappropriate fuel pressure
- Faulty fuel injectors
How to Fix the DTC P0138 2009 Toyota Camry?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0138 2009 Toyota Camry code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0138 2009 Toyota Camry Code
1. What does OBDII code P0138 on a 2009 Toyota Camry mean?
This code indicates a high voltage condition in the oxygen sensor circuit of Bank 1 Sensor 2.
2. What are the common symptoms of a P0138 code in a 2009 Toyota Camry?
Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and an illuminated check engine light.
3. What are the possible causes of a P0138 code in a 2009 Toyota Camry?
Potential causes include a faulty oxygen sensor, wiring issues in the oxygen sensor circuit, exhaust leaks, or a problem with the engine's air-fuel mixture.
4. How can I diagnose the P0138 code on my 2009 Toyota Camry?
Diagnosis typically involves using an OBDII scanner to retrieve the code, visually inspecting the oxygen sensor and its wiring, checking for exhaust leaks, and testing the sensor's voltage output.
5. Can I still drive my 2009 Toyota Camry with a P0138 code?
While it may be possible to drive with this code present, it is recommended to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.
6. How can I repair a P0138 code on my 2009 Toyota Camry?
Repair options may include replacing the oxygen sensor, repairing wiring or connectors in the sensor circuit, fixing any exhaust leaks, or addressing issues with the air-fuel mixture.
7. Is it possible to reset the P0138 code on a 2009 Toyota Camry without fixing the underlying issue?
While you can clear the code with an OBDII scanner, the check engine light is likely to reappear if the root cause of the problem is not addressed.
8. How much does it cost to fix a P0138 code on a 2009 Toyota Camry?
The cost of repairs can vary depending on the specific issue causing the code, but it may involve parts and labor expenses for replacing the oxygen sensor or addressing other related issues.
9. Can a DIY enthusiast fix a P0138 code on a 2009 Toyota Camry?
Depending on your skill level and access to tools, some DIY enthusiasts may be able to address this code by replacing the oxygen sensor or checking for wiring issues. However, professional assistance is recommended for more complex repairs.
10. How can I prevent a P0138 code from recurring on my 2009 Toyota Camry?
To prevent this code from coming back, it's essential to address any underlying issues promptly, perform regular maintenance on your vehicle, and ensure proper installation of components like the oxygen sensor.
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