P0038 Mercedes-Benz Code - HO2S Heater Control Circuit High Bank 1 Sensor 2
Quick Answer
Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground, Heated Oxygen Sensor (H2OS) 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
- P0038 Mercedes-Benz indicates HO2S Heater Control Circuit High Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground, Heated Oxygen Sensor (H2OS) 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 P0038 Mercedes-Benz Description
In order to achieve the required temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
This fault code is stored in the engine control module when the control circuit for the exhaust gas oxygen sensor heater circuit does not perform as expected. The engine control module can calculate the current flow through the heater circuit to monitor the circuit condition.
What are the Possible Causes of the DTC P0038 Mercedes-Benz?
- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0038 Mercedes-Benz?
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 P0038 Mercedes-Benz 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 P0038 Mercedes-Benz Code
1. What are the common symptoms of OBDII code P0038 in a Mercedes-Benz related to the HO2S Heater Control Circuit High Bank 1 Sensor 2?
Symptoms may include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.
2. What causes the HO2S Heater Control Circuit High Bank 1 Sensor 2 code P0038 in a Mercedes-Benz?
This code is typically triggered by a malfunctioning oxygen sensor heater circuit, a faulty oxygen sensor, or wiring issues.
3. How can I diagnose the OBDII code P0038 in my Mercedes-Benz?
Diagnosing this code usually involves checking the oxygen sensor heater circuit for continuity, testing the oxygen sensor, and inspecting the wiring for any damage or corrosion.
4. Can I drive my Mercedes-Benz with the P0038 code present?
It is not recommended to drive with the P0038 code active, as it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.
5. How do I repair the HO2S Heater Control Circuit High Bank 1 Sensor 2 code P0038 in my Mercedes-Benz?
Repairing this code often involves replacing the faulty oxygen sensor, repairing any damaged wiring, or addressing issues with the oxygen sensor heater circuit.
6. Is it possible for a faulty fuse to cause the P0038 code in a Mercedes-Benz?
Yes, a blown fuse related to the oxygen sensor heater circuit can also trigger the P0038 code and should be checked during diagnosis.
7. Will resetting the check engine light make the P0038 code disappear permanently?
Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return.
8. How much does it typically cost to repair the HO2S Heater Control Circuit High Bank 1 Sensor 2 code P0038 in a Mercedes-Benz?
The cost of repair can vary depending on the specific cause of the code, but it may range from $200 to $500 or more, including parts and labor.
9. Can a DIY enthusiast fix the P0038 code in a Mercedes-Benz, or is professional help necessary?
While some DIY enthusiasts may be able to diagnose and repair the issue themselves, seeking professional help is recommended for accurate diagnosis and proper repair.
10. How often should the oxygen sensors in a Mercedes-Benz be inspected to prevent the recurrence of the P0038 code?
It is recommended to inspect and replace oxygen sensors as part of regular maintenance, typically every 60,000 to 100,000 miles to prevent issues like the P0038 code from occurring.
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