2019 Nissan LEAF Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2019 Nissan LEAF: Common Causes and Solutions

Find Repair Location
Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Emissions System
0%
60% chance it's
Something else
The most common reasons a 2019 Nissan LEAF has a check engine light are an emissions system component, a sensor, or a catalytic converter.
  • Emissions System: A faulty emissions system component, such as an oxygen sensor or EGR valve, can lead to increased emissions and trigger the check engine light.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2019 Nissan LEAF has a check engine light?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Due to the nature of electrical systems on modern vehicles, the range of problems these can cause are nearly limitless. However, there is a way to categorize them in two ways. Permanent and intermittent problems. Permanent problems appear and remain. This may be the vehicle will not start, the radio does not work, or the door chime will not turn off among many, many others. These problems are more straight-forward to diagnose since they present themselves at all time. This means there will always be a fault to find. Intermittent electrical problems, however, can be difficult or impossible to locate, since they appear then disappear without warning. The best case scenario for an intermittent issue is when replicating the problem is easily accomplished and understood. This allows a technician to make an issue semi-permanent, allowing them to find the fault. Other issues that come and go without warning and cannot be replicated on demand must occur when the technician is servicing the vehicle, otherwise there is no problem to correct. It is most important to understand that electrical system faults always require inspection, and can include the vehicle working in any manner, or not working at all.

Like we noted in the last section, general diagnosis symptoms are the most vague of the bunch. There are several diagnostic spectrums, electrical diagnosis, drivability diagnostics, engine diagnostics, transmission diagnostics, and the list could continue for about 5 or 10 more spectrums of diagnostics. The most important take-away here, is that general diagnostics are diagnostics that have no other spectrum in which they fit, or the problem is unknown. This means that any vehicle left outside of a repair facility with the keys and an authorization to perform diagnosis will be diagnosed under the general diagnosis spectrum.

When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, or an engine that won't start. In some cases, no abnormal symptoms will be experienced. Other systems like the transmission or ABS can cause the Check Engine Light to illuminate and lights for those systems can come on at the same time. Similar lights may say "Check Engine Soon", "Malfunction Indicator Light" or just "Check". In rare case the engine can overheat.

What are the initial diagnostic steps to take for a check engine light on a 2019 Nissan LEAF?

When faced with a check engine light on your 2019 Nissan LEAF, it's essential to adopt a systematic diagnostic approach to efficiently identify the issue. Start by checking the gas cap, as a loose or damaged cap is a common and easily fixable cause of the warning light. Next, examine your dashboard for any additional warning lights or messages that could provide further context about the problem. Utilizing an OBD-II scanner is a crucial step; it allows you to retrieve error codes from the vehicle's computer, which can direct you to the specific issue at hand. Additionally, inspect the engine bay for any visible signs of damage, such as frayed wires or loose hoses, which could indicate a more serious problem. Finally, monitor your vehicle's performance for any irregularities like rough idling or stalling, as these symptoms can offer valuable insights into the underlying issue. By following this structured approach, you can effectively diagnose the cause of the check engine light and take appropriate action to resolve it.

What are the common problems that could cause the check engine light to illuminate in a 2019 Nissan LEAF?

When the check engine light comes on in your 2019 Nissan LEAF, it can be a source of concern, but understanding the common problems can help you diagnose the issue. One frequent culprit is a loose gas cap, which can easily be checked and tightened to potentially resolve the warning light. Another common issue is a faulty oxygen sensor, which affects fuel efficiency and emissions; if you notice a drop in performance, this may be worth investigating. Additionally, problems with the catalytic converter can trigger the light, often indicating a more serious issue that may require professional attention. Worn spark plugs can also lead to engine performance issues, so inspecting these components is advisable. Furthermore, a malfunctioning mass airflow sensor can disrupt the air-fuel mixture, while faulty ignition coils may cause misfiring and rough idling. By addressing these common problems promptly, you can maintain your vehicle's performance and efficiency. If the check engine light persists after your DIY efforts, consulting a qualified mechanic is recommended for a thorough diagnosis.

How urgent is it to address the check engine light on a 2019 Nissan LEAF?

Addressing the check engine light on your 2019 Nissan LEAF should be a priority, as neglecting this warning can lead to serious consequences. The check engine light is not just a minor inconvenience; it signals potential issues with your vehicle's engine or emissions system that could escalate if left unaddressed. Ignoring this alert may result in more significant damage, leading to costly repairs and decreased vehicle performance. Additionally, driving with the check engine light on can compromise fuel efficiency and may even pose safety risks, as it could indicate underlying problems that affect the vehicle's operation. To ensure your Nissan LEAF remains in optimal condition, it is crucial to have the vehicle diagnosed by a qualified mechanic as soon as possible. Taking prompt action not only helps maintain your vehicle's health but also saves you from potential headaches and expenses down the road.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.