2018 Tesla 3 Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2018 Tesla Model 3: Common Causes and Solutions

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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 2018 Tesla 3 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 2018 Tesla 3 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.

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 2018 Tesla 3?

When faced with a check engine light on your 2018 Tesla Model 3, it's essential to approach the situation methodically to identify the issue without unnecessary complications. Start by checking for any immediate problems such as unusual sounds or smells, as these could indicate a more serious issue that requires immediate attention. Next, inspect the gas cap; a loose or improperly sealed gas cap is a common culprit for triggering the check engine light and is an easy fix. If everything seems normal, try restarting your vehicle, as this can sometimes reset the system and turn off the light. If the light remains illuminated, using a diagnostic tool to scan for error codes can provide valuable insights into the specific problem. This step is crucial as it allows you to pinpoint the issue more accurately. Should these initial steps not resolve the problem, it may be time to reach out to a Tesla service center for professional assistance, ensuring that your vehicle receives the proper care it needs. By following this structured approach, you can effectively troubleshoot the check engine light and determine the best course of action.

What are the common problems that could cause the check engine light to activate in a 2018 Tesla 3?

When the check engine light illuminates in a 2018 Tesla Model 3, it can signal a range of issues that are crucial for DIY enthusiasts to understand. One of the primary concerns may be battery-related problems, which could stem from a malfunctioning battery pack or issues within the charging system. Additionally, the electric motor and drivetrain components are vital to the vehicle's performance, and any faults here can also trigger the warning light. Software glitches are another common culprit; these may require a simple software update or reset to resolve. Furthermore, sensor malfunctions, particularly with the oxygen sensor or other performance-monitoring sensors, can lead to the check engine light activation. Lastly, issues with the regenerative braking system or other safety features should not be overlooked, as they can also cause the light to turn on. Addressing these issues promptly is essential for maintaining the vehicle's performance and safety, and while some problems may be manageable for a DIYer, others may necessitate professional diagnostics and repairs.

How urgent is it to address the check engine light on a 2018 Tesla 3?

Addressing the check engine light on a 2018 Tesla Model 3 is crucial for maintaining the vehicle's performance and safety. This warning light indicates that there may be underlying issues with critical systems such as the powertrain or emissions, which, if ignored, could escalate into more severe problems. Neglecting the check engine light can lead to costly repairs, decreased fuel efficiency, and even safety hazards on the road. For DIY enthusiasts, it is essential to act quickly; consulting the vehicle's manual or reaching out to a certified Tesla service center can provide valuable insights into the specific issues indicated by the light. By taking prompt action, you not only protect your investment but also ensure that your Tesla continues to operate smoothly and efficiently.

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2018 Tesla Model 3 Check Engine Light Causes & Solutions