Quick Answer
P0155 means: P0155 indicates a malfunction in the oxygen sensor heater circuit for Bank 2.
Can I drive with P0155? Immediate attention required to prevent further damage to the engine and exhaust system.
Common Questions
What does P0155 mean and how does it affect my car?
The P0155 code means that your vehicle's oxygen sensor heater circuit for Bank 2 is malfunctioning. This can lead to poor engine performance, reduced fuel efficiency, and increased emissions. If left unresolved, the issue can potentially damage your catalytic converter, leading to costly repairs.
What are the most common causes of P0155 and how much does it cost to fix?
Common causes of P0155 include a faulty oxygen sensor heater, wiring issues, or a blown fuse. Repair costs range from $50 for minor repairs to $300 for sensor replacement. Always diagnose the issue thoroughly to ensure the right parts are replaced.
Can I drive my car with P0155 or should I stop immediately?
While you may still drive your car with the P0155 code, it's advisable to limit driving until repairs are made. Continuous operation can worsen the condition and lead to more significant engine damage.
How can I diagnose P0155 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for DTCs to confirm the P0155 code. The app also provides freeze frame data and live sensor readings that can help you understand the problem better before seeking repairs.
What vehicles are most commonly affected by P0155?
The P0155 code is frequently seen in models such as the 2001-2006 Toyota Camry and the 2004-2008 Honda Accord. If you own any of these vehicles, be vigilant with your vehicle's diagnostics and maintenance.
How can I prevent P0155 from happening again?
To prevent the P0155 code from reoccurring, regularly inspect your vehicle's oxygen sensors and wiring for damage. Keep up with routine maintenance and consider using high-quality fuel to help maintain engine health.
What is P0155?
The diagnostic trouble code (DTC) P0155 indicates a malfunction in the oxygen sensor heater circuit, specifically for the oxygen sensor located in Bank 2 (the side of the engine that does not include cylinder 1). Oxygen sensors are essential for maintaining optimal air-fuel ratios in your engine, and the heater within the sensor helps it reach operating temperature quickly to reduce emissions effectively. When the vehicle's engine control module (ECM) detects that the heater circuit is not functioning correctly, it triggers this code. This can lead to poor fuel economy, increased emissions, and potential damage to the catalytic converter. If you own a vehicle like the 2005 Toyota Camry or 2007 Honda Accord, it’s crucial to address this issue promptly to avoid long-term damage. Ignoring this code may not only affect your vehicle’s performance but can also lead to failing an emissions test. In many cases, P0155 may also cause the check engine light to illuminate, prompting further diagnostics. Fortunately, this code is often rectified by replacing the faulty oxygen sensor or repairing the heater circuit, which can restore your vehicle’s efficiency and performance.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0155 is present:
- Check engine light stays on constantly, indicating an underlying issue that needs attention.
- Engine hesitates during acceleration, which can lead to a frustrating driving experience.
- Fuel economy decreased by 10-15%, meaning you may notice more frequent trips to the gas station.
- Rough idling and stalling can occur, especially during cold starts, affecting drivability.
- Increased emissions may lead to failed emissions testing, resulting in fines or repair mandates.
Possible Causes
Most common causes of P0155 (ordered by frequency):
- Faulty oxygen sensor heater (70% likelihood) - The most common issue leading to P0155 is a defective heater element in the oxygen sensor itself, which can fail over time due to heat and wear.
- Wiring issues (15% likelihood) - Damaged or corroded wiring in the heater circuit can disrupt the flow of power, preventing the sensor from heating up properly.
- Blown fuse (10% likelihood) - A blown fuse related to the oxygen sensor circuit can also cause this error code, which is often overlooked.
- ECM malfunction (4% likelihood) - A malfunctioning engine control module can incorrectly read sensor data or fail to provide the necessary power to the heater.
- Exhaust leaks (1% likelihood) - While less common, leaks can affect sensor readings and lead to false codes.
P0155 Repair Costs
Cost Breakdown by Repair Type
Oxygen Sensor Replacement
Replacing the faulty oxygen sensor is the most common and effective solution for resolving P0155.
- Total: $150 - $300
- Success rate: 90%
Wiring Repair
Repairing any damaged wiring or connections in the oxygen sensor circuit.
- Total: $50 - $150
- Success rate: 80%
ECM Reprogramming
If the engine control module is found to be faulty, reprogramming or replacing it may be necessary.
- Total: $300 - $1,200
- Success rate: 70%
Money-Saving Tips for P0155
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional P0155 Diagnosis Process
Follow these systematic steps to accurately diagnose P0155. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter to check voltage and resistance in the oxygen sensor heater circuit (20-30 minutes)
Step 3: Component testing - Use a multimeter to check voltage and resistance in the oxygen sensor heater circuit (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: 2005 Toyota Camry - Oxygen Sensor Replacement
Vehicle: 2005 Toyota Camry, 120,000 miles
Problem: Customer reported check engine light illumination and poor fuel economy.
Diagnosis: Diagnostic scan revealed P0155 code. Visual inspection found damaged wiring to the oxygen sensor heater.
Solution: Replaced the oxygen sensor and repaired the damaged wiring.
Cost: $250 (parts $150, labor $100)
Result: Check engine light cleared, and fuel economy improved by 15%.
Case Study 2: 2007 Honda Accord - Wiring Repair
Vehicle: 2007 Honda Accord, 90,000 miles
Problem: Customer experienced rough idling and poor acceleration.
Diagnosis: P0155 confirmed through OBD2 scan. Wiring inspection revealed corrosion.
Solution: Repaired the corroded wiring connection.
Cost: $75 (parts $25, labor $50)
Result: Engine performance normalized and no further issues reported.