2016 Scion TC Has A Check Engine Light

Common Causes of the Check Engine Light in Your 2016 Scion tC and How to Resolve Them

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Reviewed by
Andrew Hajjar
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 2016 Scion tC 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 2016 Scion tC 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 2016 Scion tC?

When faced with a check engine light on your 2016 Scion tC, the first step is to identify the problem by using an OBD scanner to read the trouble codes. This tool will help you pinpoint the specific issue triggering the light, which is crucial for effective troubleshooting. Common culprits often include problems within the emission system, ignition system, or engine timing, so it's wise to focus your attention on these areas during your initial assessment. Additionally, if you notice other warning lights, such as the AIR BAG ON or AIR BAG OFF indicators, consulting your owner's manual can provide further guidance on how to proceed. By systematically addressing these diagnostic steps, you can gain valuable insights into the underlying issues and take appropriate action to resolve the check engine light concern.

What common issues trigger the check engine light in a 2016 Scion tC?

When the check engine light illuminates in a 2016 Scion tC, it can indicate a range of issues that may require immediate attention. One of the most frequent culprits is the emission system, which can malfunction due to a faulty catalytic converter or oxygen sensor, leading to increased emissions and potential fines. Additionally, problems within the ignition system, such as worn spark plugs or ignition coils, can cause engine misfires, resulting in poor performance and fuel efficiency. Engine timing system malfunctions can also trigger the light, as improper timing can lead to severe engine damage if not addressed. Transmission issues may arise, affecting the vehicle's shifting capabilities, while a deactivated traction control system can lead to reduced vehicle stability. Furthermore, a failing Mass Air Flow (MAF) sensor can disrupt the air-fuel mixture, causing performance issues. Lastly, temporary loss of traction or an ABS malfunction can also illuminate the check engine light, indicating that the vehicle's safety systems may be compromised. Addressing these issues promptly is crucial for maintaining the vehicle's performance and safety.

How urgent is it to address the check engine light in a 2016 Scion tC?

When the check engine light comes on in your 2016 Scion tC, it’s essential to take immediate action, especially if the light is flashing. A flashing check engine light signals a critical issue that could lead to severe engine damage if not addressed right away. In such cases, it’s advisable to turn off the engine and seek professional help to prevent further complications. On the other hand, a steady check engine light, while less urgent, still warrants prompt attention. It could indicate minor issues, such as a loose gas cap, but ignoring it can lead to more significant problems over time. For DIY enthusiasts, the first step in addressing the check engine light is to use an OBD-II scanner to retrieve fault codes, which can provide valuable insights into the underlying issue. By diagnosing the problem early, you can save yourself from costly repairs and ensure your vehicle remains in optimal condition. Remember, timely intervention is key to maintaining the health of your Scion tC and avoiding safety risks on the road.

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