In this guide, you will learn what it means when your Nissan check engine light comes on.

Common problems that trigger Nissan's check engine light to stay or flash. Lastly, learn how to diagnose Nissan's check engine light yourself using an OBD-II scanner.

When Nissan check engine or service engine lights come on one or more fault codes get stored in the On-Board Diagnostic (OBD) system of your vehicle.

What Does Nissan Check Engine Light Mean?

When your Nissan check engine light stays on, it means the onboard diagnostic (OBD) system has detected a malfunction with the way the engine is running, a problem with the emission system or in some cases it can indicate a transmission problem.

To find out the fault code that triggered the check engine light read the codes using an OBD-II scanner.

Under normal operation, your Nissan check engine light should come on when you insert the key in the ignition. After 5 seconds or once you start the engine, the light should turn off as long as no fault codes are present.

If the check engine light stays on, the problem can be something as simple as a loose gas cap or a faulty oxygen sensor.

Symptoms

What you may notice when Nissan check engine light comes on.

• Rough running
• Engine juddering
• Lack of power
• Poor throttle response
• Unusual engine sounds
• Smoke from the exhaust

Any of these symptoms show that your engine is not running as it should.

How to Diagnose Nissan Check Engine Light

Follow instructions below to read Nissan check engine light codes yourself with an OBD2 scanner.

1. Locate the diagnostic port under the dashboard and plugin your OBD2 scanner.
2. Turn on ignition but do not start the engine.
3. Allow your OBD2 scanner to turn on. Press Enter to read codes.

Auto parts stores and some auto mechanics will often read the codes for your free of charge. Call a few near your house to find out if they read check engine light free of charge.

Common Problems

While there are hundreds of possible fault codes and issues, here is a list of the most common problems that many Nissan owners face.

• Oxygen sensor: O2 sensor is mounted in the exhaust manifold. It monitors how much unburned oxygen is in the exhaust. Monitoring oxygen levels in the exhaust is a way of gauging the fuel mixture. O2 sensors tells the ECU if the fuel mixture is burning rich or lean. A bad O2 sensor is one of the most common problems that triggers check engine light on Nissan vehicles. 
• Loose Gas Cap: A loose gas cap allows fuel fumes to escape the fuel tank. If it is detected by the engine it will trigger the check engine light. Missing, damaged or loose gas cap can trigger the check engine light. 
• Variable Valve Timing: Engines equipped with a Variable Valve Timing can have problem with VVT solenoids, caused by oil sludging.  This can result in hard starting, poor idle, and loss of power. On V6 engines, it is also possible to have a leaking galley gasket, located behind the timing chain. Related Codes: P0021 or P0011 and P0014 or P0024.

• Mass Air Flow Sensor: You may have a situation when your engine is running roughly, stalls, does not want to idle and you notice a black exhaust smoke. This can be caused by a dirty MAF sensor. Only use MAF cleaner fluid for cleaning the sensor. Related Code P0101

• Vacuum Leaks: Most V6 engines have quite complex intake manifolds, with various possible intake vacuum leak points. As that will cause lean running conditions, you might experience rough idle, lack of power or hesitation on accelerations. Related Codes: P0171 or P0174

• Spark Plugs:  A random misfire, especially when the engine is on operating temperature, can be caused by several things. In addition to usual spark plugs and ignition coil, a leaking cam cover seals will result in oil contamination to the coil boots. Lastly, dirty fuel injectors or intake air leaks can also cause a misfire. Related Codes: P0300

• Camshaft Position Sensor: Camshaft position sensors play a key role in engine operation. Even the slightest irregularities in sensor readings will cause rough running and loss of power, followed by a 'check engine' light. Replacing the affected sensors is the best solution. Related Codes: P0340

• Throttle Position Sensor: Most Nissan engines that have electronic throttle plates are prone to idle related problems. This is usually caused by a carbon build-up that needs to be cleaned with a carb cleaner. In most cases, this will cause a high idle speed and a check engine light. In such an event, you must perform a throttle body relearning procedure. Related Codes: P0507

• Transmission:  Many 2005 onward Nissa vehicles have a CVT automatic gearbox, which can be troublesome. The main reason for this is within a stepper motor, which fails with time. As a result, the gearbox will not shift, and the check engine light will be triggered. In most cases, the stepper motor can be replaced without removing the gearbox. Related Codes: P1778

Nissan Check Engine Light  Flashing

One thing you must never ignore is a flashing check engine light. This happens when a misfire on one or more cylinders is detected. This can easily damage a catalytic converter in just a few minutes.

It is not recommended to drive or keep the engine running if your check engine light is flashing.

Conclusion

When your Nissan check engine light comes to the first step in finding why is to read the fault codes with an OBD-II scanner to retrieve the fault codes. Check if a local auto part store will read the codes free of charge. 

One of the most common problems that trigger the check engine light on Nissan vehicles is a loose gas cap. If you recently added fuel, you may have forgotten to tighten the gas cap.

Find a safe location to pull over and tighten the gas cap until it is on tight or clicks. In some cases, the gas cap has to be replaced because the gasket that seals the vapor fuels from escaping can get damaged.

Don't expect the check engine light to turn off immediately. It can take up to a week for the check engine light to reset on its own or you can use an OBD2 scanner to reset the light yourself.

It is not recommended to drive your Nissan if the check engine light is flashing.

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