By Ezra Lane The P0139 code on your Nissan indicates that the O2 sensor on bank 1, sensor 2 is responding slower than expected, which can affect your car's fuel efficiency and emissions. This issue might stem from the sensor's age, contamination, or complications in the wiring. It's important to inspect the sensor for any visible damage and check the wiring for issues like frays or corrosion. Replacing a faulty sensor could cost you between $200 and $300, and addressing this promptly avoids further damage to your vehicle. Not resolving it could lead to higher fuel consumption and risk other engine problems. By continuing to explore this topic, you could uncover deeper insights on maintaining your vehicle's performance and efficiency.
P0139 Nissan Code Meaning
The P0139 code on your Nissan signifies a delayed response from the rear oxygen sensor in bank 1, often due to contamination, wiring issues, or sensor aging.
Inspect and address potential physical damage, contamination, or wiring problems to resolve this issue effectively.
Error Code P0139 Symptoms
When your Nissan shows a P0139 error code, you might notice a few clear signs. This code means the oxygen sensor in bank 1, sensor 2, is slow to respond.
- Check Engine Light: The Check Engine Light will likely come on. This light signals that something needs fixing in your car.
- Poor Fuel Economy: The sensor affects how your car uses fuel. If it's not working right, you may need to fill up your tank more often.
- Rough Idling or Engine Misfire: A slow sensor can make the engine run unevenly, causing rough idling or engine misfires. These issues can make driving less smooth and may lead to bigger engine problems over time.
If you notice any of these issues, it's a good idea to get them checked to keep your car running well.
Causes of Nissan P0139 Fault Code
If your Nissan is showing the P0139 error code, it means there's an issue with the O2 sensor in bank 1, sensor 2. This sensor isn't working as quickly as it should, which can affect how your car runs.
Here are some possible reasons:
- Bad O2 Sensor: Sometimes the sensor just wears out or gets dirty, which stops it from checking oxygen levels properly.
- Exhaust Leaks: If there's a crack or hole in the exhaust system before the sensor, it can let extra air in. This extra oxygen can give the sensor wrong information, causing it to react slowly.
- Engine Problems or Bad Gas Mileage: If the engine isn't burning fuel right, it changes the exhaust gases. This can make the sensor give out wrong readings. If the engine is using too much or too little fuel, it can trigger this code.
Fix these problems to make your Nissan run better and use fuel more efficiently. Knowing these causes helps you sort out what's wrong.
Tools Needed to Diagnose
To figure out the P0139 code on your Nissan, you need a few tools to check your O2 sensor.
Here's what you'll need:
- OBD-II Scanner: This handy gadget reads the codes from your car's computer. It helps you see if the P0139 code is the issue.
- Digital Multimeter: Use this to see if the O2 sensor is working right by checking its response and voltage.
- Vacuum Pump: This tool helps you find any leaks in the exhaust system that might be messing with the O2 sensor.
Having these tools will help you understand what's happening with your O2 sensor.
How to Fix P0139 Nissan Error Code – Step by Step
Step 1:
Inspect the downstream O2 sensor (bank 1, sensor 2) for any visible damage or contamination. Look for cracks, burns, or oil deposits that might impair its function.
Step 2:
Examine the wiring and connectors leading to the O2 sensor. Check for frays, corrosion, or disconnections that could affect the sensor's readings.
Step 3:
Use an OBD-II scanner to monitor the O2 sensor's performance. A sluggish response often indicates that the sensor is failing. Compare the response time to manufacturer specifications.
Step 4:
If the sensor is defective, replace it. Ensure you choose a compatible sensor for your Nissan model. Install the new sensor, ensuring a secure fit to avoid any leaks.
Step 5:
After replacing the sensor, clear the P0139 code with your scanner. Finally, take a test drive to ensure that the issue is resolved and the code doesn't reappear.
Common Diagnosis Mistakes
In Nissan vehicles, mechanics often miss that problems other than the O2 sensor can cause the P0139 code.
Here are three mistakes to watch out for:
- Exhaust Leaks: Check for leaks in the exhaust system first. A leak can let in extra air, which may confuse the sensor, leading to incorrect readings.
- Wiring Problems: Look at the wires connecting to the O2 sensor. Damaged or worn wires can disrupt the signal, making it seem like the sensor is slow.
- Other Engine Issues: Sometimes, the problem isn't with the sensor but with the engine. Misfires or a bad catalytic converter can cause wrong readings.
P0139 Nissan Repair Cost
Fixing a P0139 code on a Nissan can cost different amounts depending on what's wrong. If you need a new oxygen sensor, it usually costs between $200 and $300 for both parts and work.
But if the issue is with the wiring or the catalytic converter, it can get more expensive. Fixing wiring might cost you anywhere from $100 to $500, based on how bad the damage is and the rates at the repair shop you choose.
If it's the catalytic converter, replacing it can cost between $900 and over $2,000, including parts and labor.
To find out what's wrong, you should get a professional diagnosis. This check-up itself can cost between $75 and $150. Skipping it might lead to spending money on parts that aren't needed.
Think about the cost of repairs compared to how old your car is and its overall shape. If the car is old, fixing it mightn't be worth it.
Consider all these details before deciding what to do.
Related Error Codes on Nissan
When your Nissan shows a P0139 error code, there might be more codes appearing. These are usually related to the oxygen sensor or nearby systems. Recognizing these can help figure out what's wrong with your car.
Here's a simple guide to some related error codes:
| Code | Description | Impact on Vehicle |
|---|---|---|
| P0133 | O2 Sensor Circuit Slow Response (Bank 1) | Can cause issues with the fuel mix |
| P0171 | System Too Lean (Bank 1) | May lead to misfires and poor engine performance |
| P0300 | Random/Multiple Cylinder Misfire Detected | Might harm the engine if not fixed |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) | Signals possible catalytic converter problems |
These codes suggest problems with your vehicle's emission system or engine control. They might overlap with what a P0139 code indicates. Fixing them soon can help avoid bigger issues. It's best to check with a mechanic to figure out and fix all the problems these codes point to.
Can I drive safely with P0139 Nissan?
Yes, you can drive your Nissan with the P0139 error, but be careful.
It means an O2 sensor is slow, causing more fuel use and pollution.
It won't break down suddenly, but get it fixed soon to avoid bigger problems.
Drive only if needed.
People Also Ask
What Is the Average Lifespan of an O2 Sensor in a Nissan?
In a Nissan, an O2 sensor usually lasts between 60,000 and 100,000 miles. How you drive and take care of your car can change this. Checking it regularly can help it last longer.
Can Weather Conditions Affect O2 Sensor Performance?
Yes, weather can change how an O2 sensor works. In cold or damp weather, the sensor might react slower or give wrong readings. This can affect how your car uses fuel and controls emissions, making it less efficient and more polluting.
Are Aftermarket O2 Sensors Reliable for Nissan Vehicles?
Aftermarket O2 sensors for Nissan cars can work well if you pick good brands. Cheaper ones might not work as well and could cause problems. Always make sure to choose trusted brands for the best results.
How Does Altitude Impact the O2 Sensor's Readings?
At higher places, the air is thinner, so there's less oxygen. This can make your car's O2 sensor give different readings because the engine burns fuel differently. It might seem like there's too much fuel, making the sensor think the engine is running lean.
Can a Faulty O2 Sensor Increase Fuel Consumption?
Yes, if an O2 sensor is not working right, it can make your car use more gas. This is because the car's computer can't measure the air and fuel mix correctly, which makes the engine burn more fuel than needed.