P2273 Code - HO2S Signal Stuck Rich Bank 2 Sensor 2
Quick Answer
The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Heated Oxygen Bank 2 Sensor 2, Heated Oxygen Bank 2 Sensor 2 harness is open or shorted, Heated Oxygen Bank 2 Sensor 2 circuit poor electrical connection. 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
- P2273 indicates HO2S Signal Stuck Rich Bank 2 Sensor 2.
- Common causes
- Common causes include Faulty Heated Oxygen Bank 2 Sensor 2, Heated Oxygen Bank 2 Sensor 2 harness is open or shorted, Heated Oxygen Bank 2 Sensor 2 circuit poor electrical connection.
- 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 P2273 Description
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM does not detect an HO2S voltage less than 100 mV before accumulated mass airflow exceeds a calibrated value.
What are the Possible Causes of the DTC P2273?
- Faulty Heated Oxygen Bank 2 Sensor 2
- Heated Oxygen Bank 2 Sensor 2 harness is open or shorted
- Heated Oxygen Bank 2 Sensor 2 circuit poor electrical connection
- Low or high fuel system pressure
- Fuel contamination
- Faulty fuel injectors
- Exhaust gas leaks
- Engine vacuum leaks
How to Fix the DTC P2273?
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
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2273 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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Information for Specific Makes
- P2273 BMW — O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2
- P2273 Buick — HO2S Signal Stuck Rich Bank 2 Sensor 2
- P2273 Cadillac — HO2S Signal Stuck Rich Bank 2 Sensor 2
- P2273 Chevrolet — HO2S Signal Stuck Rich Bank 2 Sensor 2
- P2273 Dodge — Oxygen Sensor Signal Stuck Rich Bank 2 Sensor 2
- P2273 Ford — Oxygen Sensor Signal Stuck Rich Bank 2 Sensor 2
- P2273 GMC — HO2S Signal Stuck Rich Bank 2 Sensor 2
- P2273 Lincoln — Oxygen Sensor Signal Stuck Rich Bank 2 Sensor 2
- P2273 Mercedes-Benz — O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2
- P2273 Mercury — Oxygen Sensor Signal Stuck Rich Bank 2 Sensor 2
Frequently Asked Questions about P2273 Code
1. What are the common symptoms of OBDII code P2273?
- Common symptoms include poor fuel economy, rough idling, black smoke from the exhaust, and a noticeable decrease in engine performance.
2. What does the OBDII code P2273 indicate?
- The code P2273 indicates that the downstream oxygen sensor on bank 2 (located after the catalytic converter) is detecting a consistently rich air-fuel mixture.
3. What are the possible causes of OBDII code P2273?
- Possible causes include a faulty oxygen sensor, issues with the fuel system (such as a leaking injector), vacuum leaks, exhaust leaks, or problems with the catalytic converter.
4. How can I diagnose the OBDII code P2273?
- Diagnosis typically involves checking the downstream oxygen sensor's readings, inspecting for any visible leaks in the exhaust system, and performing a fuel pressure test to rule out fuel system issues.
5. Can I continue driving with OBDII code P2273?
- It is not recommended to continue driving with this code as it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.
6. How do I repair OBDII code P2273?
- Repair involves addressing the root cause of the rich air-fuel mixture, which may include replacing the oxygen sensor, fixing any leaks in the exhaust system, resolving fuel system issues, or replacing the catalytic converter if necessary.
7. Will resetting the OBDII code P2273 make it go away permanently?
- Resetting the code without addressing the underlying issue will not make it go away permanently. It is important to diagnose and repair the root cause to prevent the code from reappearing.
8. Can a DIY enthusiast fix OBDII code P2273 at home?
- Depending on the cause of the code, some DIY enthusiasts may be able to address the issue at home by replacing the oxygen sensor or fixing minor leaks. However, complex issues may require professional assistance.
9. How long does it typically take to repair OBDII code P2273?
- The repair time can vary depending on the specific cause of the code and the extent of the repairs needed. It may take anywhere from a few hours to a full day to diagnose and fix the issue.
10. Is it necessary to have OBDII code P2273 repaired immediately?
- While it may not be an emergency, it is recommended to address the issue promptly to prevent potential damage to the engine and emissions system over time.
Discuss the causes and fixes for P2273 OBDII Code
-
2004 bmw x-3 3.0i keeps showing trouble code P2273 anyone know which sensor this i?. Is this sensor located at bank 2 cylinder 456 prior to the catalytic converter?
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