By Ezra Lane When your 2002 Nissan Altima displays the P0720 code, it points to a malfunction in the output speed sensor circuit, generally involving either a faulty vehicle speed sensor (VSS), damaged wiring, or corroded connections. This issue can cause your speedometer to offer inaccurate readings and your transmission to behave erratically, thereby affecting your driving safety and fuel efficiency. You'll need to inspect the sensor and wiring for damage and consider replacing the VSS if no wiring faults are found. Clearing the code post-repair and verifying with a test drive helps ensure the issue is resolved. Addressing this early can prevent further complications and maintain safer operation.
P0720 Nissan Code Meaning
The P0720 code in a 2002 Nissan Altima indicates a vehicle speed sensor (VSS) circuit malfunction.
Common causes include a faulty VSS, damaged wiring, or corroded connections.
Inspect and replace the sensor or repair wiring as needed, then clear diagnostic trouble codes to reset the system.
Error Code P0720 Symptoms
When a P0720 error code shows up in your car, you might notice a few things that can mess up your drive:
- Speedometer Problems
- Your speedometer might show wrong numbers. You might be driving too fast or too slow without realizing it, which can be unsafe.
- Transmission Issues
- Your car might jerk or hesitate when you try to speed up. This can make driving uncomfortable and you might worry about your car's performance.
- Poor Gas Mileage
- You might see your fuel gauge dropping faster than before. This happens because the car uses more gas than it should, which can cost you money and isn't good for the environment.
Causes of Nissan P0720 Fault Code
If your 2002 Nissan Altima shows the P0720 error code, it often relates to the vehicle speed sensor (VSS).
Here's what might be causing the problem:
- Bad Vehicle Speed Sensor (VSS)
- The VSS might be broken. If it is, your car can't measure speed correctly, leading to poor performance and unsafe driving. Think about driving without knowing your speed.
- Broken Wires or Connectors
- If the wires or connectors are damaged, the car can't get the speed signals it needs. It's like trying to listen to a radio with bad reception.
- Dirt and Rust
- Dirt or rust can mess up the sensor's readings. It's like looking through a foggy window. Your car's system gets the wrong information, similar to how your view would be unclear.
Tools Needed to Diagnose
To diagnose the P0720 fault code on your 2002 Nissan Altima, you'll need a few tools.
Having these tools will make the process easier and help you find the issue accurately.
Here's what you should have:
1. Digital Multimeter
This tool checks the voltage and resistance in the speed sensor circuit.
It helps you find electrical problems, so you don't make mistakes or do unnecessary repairs.
2. OBD-II Scanner
Use this scanner to read the P0720 code and any other codes.
It helps you understand what's going on with your car and guides you on what to fix.
3. Wiring Diagram and Basic Hand Tools
A wiring diagram for your car model helps you trace the speed sensor circuit.
With tools like wrenches and screwdrivers, you'll be ready to fix the problem.
How to Fix P0720 Nissan Error Code – Step by Step
Step 1:
Connect a diagnostic scan tool to your 2002 Nissan Altima to confirm the presence of the P0720 error code and check for any additional trouble codes. This ensures you're targeting the correct issue.
Step 2:
Inspect the vehicle speed sensor (VSS) wiring harness for any signs of damage, corrosion, or loose connections. Damaged wires can disrupt the sensor's operation, leading to the P0720 code.
Repair or replace any damaged parts as necessary.
Step 3:
If the wiring is intact, proceed to replace the faulty vehicle speed sensor. Remove the old sensor and install a new one, ensuring it's properly aligned and securely fastened for optimal transmission performance.
Step 4:
After installing the new sensor, use the scan tool to clear all diagnostic trouble codes from the engine control module (ECM). This reset is crucial to ensure that any previous error codes are removed.
Step 5:
Take your vehicle for a test drive to confirm that the P0720 error code doesn't reappear and that the transmission is functioning correctly.
If the issue persists, further diagnosis may be necessary.
Common Diagnosis Mistakes
When dealing with the P0720 error code, be careful not to make these common mistakes:
1. Blaming the Vehicle Speed Sensor (VSS) Right Away
Don't immediately assume the speed sensor is broken. Check the wires and connectors first. Sometimes, they can be the real problem instead of the sensor.
2. Overlooking Other Fault Codes
Don't focus only on the P0720 code. There might be other codes related to the speed sensor issue. Run a full diagnostic scan to find any additional problems that might be affecting the sensor.
3. Skipping the Test Drive After Repairs
Always take the car for a drive after fixing it. This helps you know if the problem is really gone. If you skip this, you might still have issues that need attention.
P0720 Nissan Repair Cost
Fixing a P0720 error code in a 2002 Nissan Altima usually costs between $150 and $300. Most of this cost is for replacing the vehicle speed sensor, which can be $50 to $150. Labor charges vary, generally ranging from $80 to $150 per hour.
Costs can change based on different factors. Where you live affects repair shop rates. The condition of your Altima might show other problems during diagnosis, which can raise the bill.
A P0720 code should be fixed quickly to prevent bigger issues. Getting a prompt check can keep costs lower.
Choose a trusted mechanic, especially one familiar with Nissan cars, for an accurate estimate and good service.
Related Error Codes on Nissan
When you see error code P0720 in your Nissan, other related codes might appear too. These codes often point to issues with the speed sensor system of your car. You might notice codes like P0721, P0722, P0730, and P0500, each indicating different problems.
Here's a simple look at what these codes mean:
| Code | What It Means | What It Does to Your Car |
|---|---|---|
| P0721 | Output Speed Sensor not working well | Can cause gear shifting problems |
| P0722 | Output Speed Sensor not sending signals | Makes the speedometer inaccurate |
| P0730 | Wrong gear ratio | Leads to strange shifting behavior |
| P0500 | Vehicle Speed Sensor not working | Affects speedometer and shifting |
These codes usually show faults in related systems and often appear together. If you see more than one code, it's a good idea to check everything to find the exact problem. Ignoring these alerts may result in bigger issues like damage to the transmission or unsafe driving because of wrong speed readings. Fixing these problems early can help avoid costly repairs later.
Can I drive safely with P0720 Nissan?
Driving with a P0720 error in your Nissan isn't safe.
The sensor problem can make your speedometer wrong and cause jerky gear shifts. This makes it hard to drive safely.
Fix it soon to avoid bigger problems and stay safe on the road.
People Also Ask
What Is the Average Lifespan of an Output Speed Sensor?
An output speed sensor usually lasts between 50,000 to 100,000 miles. How long it lasts can change depending on how you drive and take care of your car. Checking it regularly can help it last longer.
Can a Faulty Output Speed Sensor Affect Fuel Economy?
Yes, a broken output speed sensor can make your car use more gas. It confuses the engine, making it harder to control how much fuel is used. This means your car might use more fuel than it should, lowering its efficiency.
Are There Aftermarket Sensors That Perform Better Than OEM?
Yes, some aftermarket sensors work better than the ones made by car companies (OEM). They may respond faster and give more accurate readings, which can make your car run better. They might also be cheaper and come with longer warranties.
How Does Temperature Affect the Output Speed Sensor's Performance?
Temperature changes can affect how well the output speed sensor works. When it gets too hot, parts might expand and not work right. When it's really cold, fluids get thicker, which can also cause problems. Over time, these changes can wear out the sensor.
Is It Necessary to Recalibrate the ECU After Replacing the Sensor?
No, you usually don't have to recalibrate the ECU when you change a sensor in a 2002 Nissan Altima. The car's system can adjust by itself. But if things still don't seem right, check the service manual or ask a car expert for help.