The P1120 code signifies a malfunction in the throttle position sensor circuit within Nissan vehicles. This component is critical for accurately controlling the air-fuel mixture and maintaining optimal engine performance. Symptoms of the P1120 code often include poor acceleration, rough idling, unexpected stalling, and decreased fuel efficiency. Common causes include faulty sensors, wiring issues, and contaminated throttle bodies. Diagnostic tools such as OBD-II scanners and multimeters are essential for troubleshooting. Repair costs typically range from $150 to $350. Addressing the P1120 promptly ensures safety and engine efficiency. Further insights into preventative measures and related codes are available for those interested.
P1120 Nissan Code Meaning
The P1120 code indicates a malfunction in the Secondary Throttle Position Sensor in Nissan vehicles, affecting the air-fuel mixture.
This can lead to performance issues like poor acceleration and rough idling.
Timely action is essential to avoid further engine damage and ensure optimal vehicle performance.
Error Code P1120 Symptoms
Malfunctions linked to the P1120 code can show several clear symptoms that affect how the vehicle drives. These problems can be frustrating and, at times, dangerous. Recognizing these symptoms can help in addressing them quickly.
- Poor Acceleration: Drivers may notice a drop in acceleration, especially when driving fast. This can make it hard to merge into traffic or pass other cars.
- Rough Idling: The engine may not run smoothly when the car is stopped. This can feel like vibrations or shaking and might point to issues with the throttle position sensor.
- Unexpected Stalling: The car may stall unexpectedly when stopping or slowing down. This can be risky, particularly in busy areas or at traffic lights.
- Decreased Fuel Efficiency: Problems with the throttle position sensor can lead to a bad air-fuel mix, which often results in using more gas. This means drivers need to refuel more often.
These symptoms can all impact how the vehicle performs.
It's a good idea to have a diagnostic check done to avoid further issues.
Causes of Nissan P1120 Fault Code
Understanding the reasons behind the Nissan P1120 fault code can help with vehicle care and repairs. This code usually relates to problems with the Secondary Throttle Position Sensor or its wiring. Recognizing these issues can lead to quicker fixes and avoid engine troubles later on.
- Faulty Secondary Throttle Position Sensor: If the sensor is not working correctly, it may send wrong throttle position signals to the engine control module (ECM). This can trigger the P1120 code.
- Wiring Issues: Damage like corrosion, fraying, or short circuits in the sensor's wiring can stop signals from reaching their destination, causing the fault code to appear.
- Poor Electrical Connections: Loose or worn-out connections can cause signal dropouts. This can impact how the engine runs and lead to the P1120 error.
- Throttle Body Contamination: Dirt buildup or damage inside the throttle body can interfere with the sensor's work. This can cause incorrect readings and result in the fault code.
In rare cases, a problem with the engine control module itself might make it show a P1120 error. Proper diagnostics can help find the real issue.
Tools Needed to Diagnose
To diagnose the Nissan P1120 fault code, you will need some specific tools. These tools help you find out what's wrong with the throttle position sensor and its connections.
- OBD-II Scanner: This tool reads the P1120 code. It also shows you any other trouble codes that might be there, helping you understand the problem better.
- Multimeter: Use this to check the voltage and resistance of the Secondary Throttle Position Sensor and its wiring. The multimeter helps you see if the sensor is working as it should.
- Wire Strippers and Connectors: If the wiring for the throttle position sensor is damaged, these tools will help you fix or replace it. Good wiring is important for sending signals correctly.
- Torque Wrench: After replacing the throttle position sensor or throttle body, this tool helps you tighten everything properly. Using the right torque keeps the parts safe from damage.
A vacuum gauge can also be useful. It helps check for air intake issues that might affect how the sensor works.
How to Fix P1120 Nissan Error Code – Step by Step
Step 1: Begin by utilizing an OBD-II scanner to confirm the presence of the P1120 error code.
Check for any additional codes that may accompany it, as this will provide a broader context for the issue at hand.
Step 2: Perform a visual inspection of the Secondary Throttle Position Sensor and its associated wiring.
Look for signs of damage, corrosion, or disconnections that could lead to erroneous readings.
Step 3: If no visible issues are found, use a multimeter to test the sensor's functionality.
Compare the voltage signals to the manufacturer specifications to determine if the sensor is operating correctly.
Step 4: If the readings from the sensor fall outside acceptable ranges, proceed to replace the Secondary Throttle Position Sensor.
Additionally, consider cleaning the throttle body to enhance sensor performance by removing any dirt or obstructions.
Step 5: After completing the repairs, clear the error codes from the Engine Control Module (ECM).
Take the vehicle for a test drive to verify that the P1120 code has been resolved and confirm that the check engine light remains off.
Common Diagnosis Mistakes
When dealing with the P1120 error code, avoiding mistakes is key to making the right diagnosis. Here are some common pitfalls to watch out for:
- Wiring Problems: Many technicians miss issues with wiring. Things like corrosion or damaged wires can affect how the throttle position sensor works. Be sure to check the wiring harness carefully.
- Jumping to Sensor Issues: Some technicians quickly decide that the Secondary Throttle Position Sensor is the problem without looking at the electrical connections first. This can lead to replacing parts unnecessarily and increase repair costs.
- Throttle Body Cleanliness: Forgetting to check if the throttle body is clean is a common error. Dirt buildup can cause incorrect readings from the sensor, making it seem like there's a real sensor failure.
- Ignoring Related Codes: Not looking at all diagnostic trouble codes can lead to missing other problems that might affect the throttle position sensor.
P1120 Nissan Repair Cost
Repair costs for the P1120 code can differ quite a bit. This depends on the Nissan model, where you live, and local labor rates.
The main part that needs fixing is the Secondary Throttle Position Sensor. This part usually costs between $50 and $150. The price can change based on whether you buy it from a dealership or an aftermarket store.
Labor costs also play a big role in the total repair bill. These costs generally range from $100 to $200. The exact amount varies based on how complicated the repair is, the mechanic's experience, and the local market.
When you add the cost of parts and labor together, the total repair costs for the P1120 code are usually between $150 and $350. This is a common estimate, but actual costs can change based on your vehicle's specific situation and the repair shop's pricing.
To get the best estimate for your situation, it's a good idea to reach out to local repair shops. They can give you a better idea based on your vehicle's condition and local trends.
Related Error Codes on Nissan
The P1120 code often appears with other related error codes. These codes can give a better understanding of issues in the throttle control system. Knowing these codes helps diagnose problems more accurately.
| Error Code | Description | Impact on Throttle Control |
|---|---|---|
| P1121 | Secondary Throttle Position Sensor range/performance | May show a problem with the secondary sensor. |
| P2135 | Throttle/pedal position sensor/switch conflict | Indicates a mismatch between throttle position and pedal input. |
| P1122 | Throttle Position Sensor Circuit Low Voltage | Shows low voltage in the primary sensor, which can affect throttle response. |
| P1123 | Throttle Position Sensor Circuit High Voltage | Indicates high voltage in the primary sensor, which can cause erratic throttle behavior. |
| P0505 | Idle Air Control System Performance | Can occur when throttle position sensors fail, leading to idle issues. |
When multiple throttle position sensor codes appear, they often signal larger problems within the throttle control system. It's important to address these codes along with P1120 to ensure a complete vehicle check-up. A thorough inspection can identify the main issues and lead to effective repairs.
Can I drive safely with P1120 Nissan?
Driving a Nissan with a P1120 code can be unsafe.
It may cause bad acceleration and rough idling, which can lead to stalling. This can make it hard to control the car.
It's important to get it checked by a mechanic quickly to stay safe on the road.
People Also Ask
What Vehicles Are Affected by the P1120 Nissan Code?
The P1120 code mostly affects Nissan cars like the Altima, Maxima, Sentra, and Pathfinder. It also impacts some Infiniti models such as the G35 and FX35. These vehicles are mainly from the late 1990s to mid-2000s.
Can a Dirty Throttle Body Cause the P1120 Code?
Yes, a dirty throttle body can cause wrong readings about how open the throttle is. This might lead to a P1120 code. Cleaning the throttle body can help it work better and fix engine problems. It's good to keep it clean regularly.
How Often Should I Check the Throttle Position Sensor?
You should check the throttle position sensor every 30,000 to 60,000 miles during regular car maintenance. If you drive in tough conditions, check it more often. This helps keep your engine running well and stops problems before they start.
Is the P1120 Code Specific to Nissan Models Only?
Yes, the P1120 code is only for Nissan cars. It means there is a problem with the secondary throttle position sensor. This code is special to Nissan and does not show up in cars made by other companies.
Will a Faulty TPS Affect Fuel Economy?
Yes, a broken throttle position sensor (TPS) can hurt fuel economy. It makes the air and fuel mixture wrong, which means the engine doesn't work well. This can use 10-20% more fuel, making you spend more money on gas.