2021 Honda Insight Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2021 Honda Insight: Common Causes and Solutions

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Reviewed by
Devin Cabugcal
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 2021 Honda Insight 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 2021 Honda Insight 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.

A faulty oxygen sensor is one of the most common causes of a check engine light. Symptoms may include a decrease in fuel mileage, hesitation or misfiring from the engine, rough idling or even stalling. A faulty sensor may cause the vehicle to fail an emissions test.

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

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 2021 Honda Insight?

When faced with a check engine light on your 2021 Honda Insight, it's essential to adopt a methodical diagnostic approach to identify the underlying 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 insight into 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 pinpoint specific issues. Additionally, visually inspect components such as spark plugs, wires, and hoses for any signs of wear or damage. Finally, monitor your vehicle's performance for any irregularities like rough idling or decreased fuel efficiency, as these symptoms can help narrow down potential causes. By following these initial steps, you can effectively gather the necessary information to address the check engine light and potentially resolve the issue yourself.

What are the common problems that could cause the check engine light to illuminate in a 2021 Honda Insight?

When the check engine light illuminates in a 2021 Honda Insight, it signals that something may be amiss under the hood, prompting DIY enthusiasts to investigate further. A loose gas cap is often the simplest explanation, as it can lead to fuel evaporation; simply tightening or replacing it can resolve the issue. More complex problems may involve a faulty oxygen sensor, which can diminish fuel efficiency and increase emissions, necessitating a replacement to restore optimal performance. Additionally, issues with the catalytic converter, spark plugs, or ignition coils can cause engine misfires, triggering the warning light. If you experience performance drops, consider checking the mass airflow sensor or the EGR valve, as both can disrupt the air-fuel mixture. Other potential culprits include a malfunctioning thermostat, vacuum leaks, or battery and charging system problems. By understanding these common issues, you can effectively troubleshoot and address the check engine light in your Honda Insight, potentially saving time and money on repairs.

How urgent is it to address the check engine light in a 2021 Honda Insight?

Addressing the check engine light in your 2021 Honda Insight is crucial for maintaining the vehicle's health and safety. This warning indicator is not just a minor inconvenience; it signals potential issues with the engine or emissions system that could escalate into more severe problems if ignored. Delaying action can lead to significant damage, resulting in costly repairs and compromising the vehicle's performance and fuel efficiency. Moreover, modern vehicles are equipped with advanced diagnostic systems that can help identify the specific issues causing the light to illuminate. By seeking a professional diagnosis promptly, you can prevent further complications and ensure your Honda Insight operates optimally. Ignoring the check engine light not only risks your vehicle's reliability but can also pose safety hazards on the road. Therefore, it is essential to take this warning seriously and address it without delay to safeguard your investment and ensure a smooth driving experience.

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