P1138 BMW Code - O2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 2
Quick Answer
P1138 BMW indicates O2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 2. Common causes include Faulty HO2S Bank 1 Sensor 2, HO2S Bank 1 Sensor 2 harness is open or shorted, HO2S Bank 1 Sensor 2 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1138 BMW indicates O2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty HO2S Bank 1 Sensor 2, HO2S Bank 1 Sensor 2 harness is open or shorted, HO2S Bank 1 Sensor 2 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1138 BMW Description
What are the Possible Causes of the DTC P1138 BMW?
- Faulty HO2S Bank 1 Sensor 2
- HO2S Bank 1 Sensor 2 harness is open or shorted
- HO2S Bank 1 Sensor 2 circuit poor electrical connection
How to Fix the DTC P1138 BMW?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1138 BMW 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 P1138 BMW Code
1. What are common symptoms of OBDII code P1138 in a BMW related to the O2 sensor heater circuit?
The common symptoms include decreased fuel efficiency, rough idling, and an illuminated check engine light.
2. What causes the OBDII code P1138 in a BMW for the O2 sensor heater circuit low voltage?
The code is typically triggered by a faulty O2 sensor, damaged wiring, or a malfunctioning heating element within the sensor.
3. How can I diagnose the O2 sensor heater circuit low voltage issue in Bank 1 Sensor 2 of my BMW?
You can use a multimeter to test the voltage at the sensor's connector, check the wiring for any damage, and inspect the sensor itself for signs of failure.
4. Can the OBDII code P1138 be cleared and reset in a BMW?
Yes, the code can be cleared using an OBDII scanner, but it is important to diagnose and address the underlying issue to prevent it from reoccurring.
5. Is it safe to continue driving my BMW with the O2 sensor heater circuit low voltage issue?
It is not recommended to drive the vehicle for an extended period with this issue, as it can lead to decreased performance and potential damage to the catalytic converter.
6. How much does it cost to repair the O2 sensor heater circuit low voltage problem in a BMW?
The cost of repair can vary depending on the extent of the issue, but replacing the O2 sensor or repairing the wiring typically ranges from $200 to $500.
7. Can I replace the O2 sensor in Bank 1 Sensor 2 of my BMW myself?
While it is possible to replace the O2 sensor as a DIY project, it is recommended to have a professional mechanic perform the replacement to ensure proper installation and calibration.
8. Will fixing the O2 sensor heater circuit low voltage issue improve my BMW's fuel efficiency?
Yes, addressing the O2 sensor heater circuit problem can help improve fuel efficiency by ensuring the engine operates at optimal performance levels.
9. How long does it take to repair the O2 sensor heater circuit low voltage issue in a BMW?
The repair time can vary depending on the exact cause of the problem, but a skilled mechanic can typically address the issue within 1-2 hours.
10. Are there any preventive measures I can take to avoid encountering the OBDII code P1138 in my BMW?
Regularly servicing your vehicle, including checking the O2 sensors and related components, can help prevent issues like the O2 sensor heater circuit low voltage problem.
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