By Ezra Lane When you see a P1402 code on your Nissan, it points to a problem with your car's Exhaust Gas Recirculation (EGR) system, specifically indicating excessive EGR flow. This malfunction typically stems from a stuck-open EGR valve or an issue with the control circuitry. You are likely experiencing less power during acceleration, rough idling, increased fuel consumption, and an illuminated check engine light. Ignoring this warning can lead to severe engine damage and increased emissions. A comprehensive diagnosis with tools like an OBD-II scanner and multimeter is crucial to pinpoint problems within the EGR valve, temperature sensors, or related electrical connections. Proactive maintenance and prompt addressing of these issues can safeguard your Nissan's performance and longevity.
P1402 Nissan Code Meaning
The P1402 code in a Nissan signifies excessive EGR flow, with the EGR valve likely stuck open or faulty control circuitry.
Inspect the valve for mechanical issues or electrical faults.
Prompt resolution is essential to maintain engine performance and emissions efficiency.
Error Code P1402 Symptoms
When your Nissan shows a P1402 code, you might see several signs that something's off. These issues can mess with how your car runs and its emissions.
Here's a simple list to help you spot the problem:
- Less Power: Your car may lose power. It might've a hard time speeding up or keeping a steady speed, especially when carrying a load or going uphill.
- Bumpy Idling: The car might shake or vibrate more when it's just sitting. The engine mightn't run smoothly and could jump around in its speed.
- Using More Gas: The EGR system helps your car use fuel better. If it isn't working right, you might notice you're filling up more often.
- Check Engine Light: The check engine light might turn on. This means your car needs to be looked at to find out what's wrong.
Causes of Nissan P1402 Fault Code
A P1402 error code in your Nissan usually means there's a problem with the Exhaust Gas Recirculation (EGR) system. This system helps reduce emissions and boost your car's efficiency.
Here's what might be causing the issue:
1. EGR Valve Clogs:
The EGR valve can get clogged with dirt and carbon deposits. This buildup can stop it from opening or closing as it should, affecting how exhaust flows into the intake manifold.
2. Bad EGR Valve:
Sometimes, the EGR valve wears out or breaks. If it's not working right, it might get stuck open or closed, messing up exhaust recirculation.
3. Blocked EGR Passages:
The passages that carry exhaust gases can also get blocked. When this happens, the gas flow is restricted, which can lead to performance issues and trigger the P1402 code.
4. Problems with EGR Control Solenoid:
The solenoid manages how the EGR system works. If it fails or sends wrong signals, it can throw off the whole EGR operation.
Tools Needed to Diagnose
To find out what's causing the P1402 error code in your Nissan, you'll need a few tools.
Whether you're a mechanic or a Nissan owner, having these tools makes the job easier. Here's what you'll need:
- OBD-II Scanner: This tool reads error codes from your car's computer. Choose one that can check the EGR system.
- Digital Multimeter: Use this to check voltage, resistance, and current in the EGR circuit. It helps find electrical problems linked to the P1402 code.
- Vacuum Pump: The EGR system uses a vacuum. This tool checks if the vacuum system is working well and can find leaks or blockages.
- Service Manual for Your Nissan Model: This has details like wiring diagrams and steps for troubleshooting. It ensures you follow the right steps for your car model.
Have these tools ready to deal with the P1402 error code effectively.
How to Fix P1402 Nissan Error Code – Step by Step
Step 1:
Use an OBD-II scanner to verify the P1402 error code. If the code appears, it indicates a potential fault in the EGR (Exhaust Gas Recirculation) system, often due to clogging or a malfunctioning EGR valve.
Step 2:
Inspect the EGR valve for any signs of damage or excessive carbon buildup, which can obstruct its movement. If the valve is dirty, clean it using an appropriate EGR valve cleaner spray. If cleaning doesn't resolve the issue, consider replacing the valve.
Step 3:
Check the EGR temperature sensor, which monitors the temperature of gases returning to the intake manifold. Test the sensor with a multimeter. If it isn't operating within the manufacturer's specified parameters, replace the sensor.
Step 4:
Examine the EGR passages for blockages. Carbon deposits may accumulate here, obstructing the flow of exhaust gases. Thoroughly clear these passages to ensure unhindered gas flow.
Step 5:
After completing the above steps, clear the error code from the vehicle's system using the OBD-II scanner. Test drive the vehicle to ensure the P1402 code doesn't reappear, confirming that the issue has been resolved.
Common Diagnosis Mistakes
When dealing with the P1402 Nissan error code, some mechanics tend to replace parts immediately without proper checks, causing extra costs and unresolved problems.
To avoid these common missteps, consider the following:
- Do a Full DTC Scan: Always begin with a complete scan for trouble codes. It identifies not only the main issue but also other potential problems.
- Check Wiring and Connectors: Look over the wires and connectors for any damage or rust. Bad connections can mimic EGR valve problems and lead you astray.
- Inspect for Vacuum Leaks: Test for vacuum leaks, as they can affect the EGR system. Use tools like a smoke machine to check if the system is airtight.
- Look for Software Updates: Sometimes, a simple software update can fix the problem. Check if Nissan has released any updates that address the P1402 error code before changing any parts.
P1402 Nissan Repair Cost
Before visiting a mechanic for a P1402 error code on your Nissan, it's good to know what costs might be involved. This error is about a problem with the EGR system, and fixing it can cost different amounts.
There are two main costs: finding out what's wrong and fixing it. To find the EGR problem, you'll usually pay between $50 to $150. This step is important because mechanics use special tools to make sure they know what's causing the P1402 error.
Repair costs depend on what part of the EGR system needs work. Cleaning the EGR valve is less expensive, costing around $100 to $200. If the valve needs replacing, the part costs anywhere from $150 to $400.
Labor adds another $50 to $150 per hour, so the total cost could be between $200 and $550. Ask your mechanic for a detailed cost breakdown. If the estimate seems too high, consider getting another opinion. This helps ensure you're paying a fair price for the repairs needed.
Related Error Codes on Nissan
When dealing with the P1402 error code on your Nissan, it's useful to know other common error codes that might show up. Understanding these codes can help keep your car running smoothly.
Here's a simple table with some related error codes:
| Code | Description | Common Causes |
|---|---|---|
| P0400 | Exhaust Gas Recirculation Flow Issue | Problems with EGR valve or tube, vacuum leaks |
| P0420 | Low Efficiency in Catalyst System | Issues with catalytic converter, O2 sensors |
| P0430 | Low Efficiency in Catalyst System (Bank 2) | Issues with catalytic converter, O2 sensors |
| P0455 | Leak in Evaporative Emission Control System | Loose fuel cap, faulty EVAP canister, damaged hoses |
Each code points to something that could affect your car's emissions and engine performance. For example, P0400 is about the exhaust gas recirculation system. P0420 and P0430 relate to the catalytic converter's efficiency. P0455 means there's a big leak in the fuel emission system. Checking these can help avoid bigger issues later.
Can I drive safely with P1402 Nissan?
No, it's not safe to drive with the P1402 code in your Nissan.
This code means there's a problem with the EGR system, which helps control engine temperature.
Ignoring it can lead to engine overheating and damage, plus your car might fail emissions tests.
People Also Ask
Does Altitude Affect the P1402 Code on a Nissan?
Altitude can change how your car's engine works and might cause some codes to appear. But for the P1402 code on a Nissan, altitude alone isn't always the reason. It's also about how well the engine is taken care of.
How Does Weather Impact the EGR System and P1402 Code?
Weather can affect your car's EGR system. Very hot or cold temperatures might make parts work less well. If sensors notice this, they could show an error code. Moisture, like rain, can also cause parts to rust and break.
Can a P1402 Code Shorten My Nissan's Engine Life?
Yes, if you don't fix problems shown by a P1402 code, it can make your Nissan's engine wear out faster. It's important to fix these problems quickly to keep your car running well and lasting a long time.
Are There Any Aftermarket Parts Recommended for Resolving P1402?
Yes, you can use good aftermarket EGR valves and solenoids to fix the P1402 error. Make sure to read reviews and talk to a mechanic to be sure they fit and work well for your car.
What Is the Impact of P1402 on Nissan's Fuel Efficiency?
If your Nissan has the P1402 issue, it means the engine isn't reusing exhaust gases properly. This makes the engine work harder and use more fuel, so your car won't go as far on the same amount of gas.