Check Engine Light Subaru Service Guide

Subaru Check Engine Light Guide

The Subaru dashboard comprises several warning lights that flash due to a malfunction. One of the most essential signals is the check engine light (CEL). The CEL is a critical indicator of the car’s health and performance because its illumination implies a potential malfunction. When the onboard computer diagnostic equipment identifies the malfunction, it triggers the CEL to illuminate. The warning light may be amber, yellow, orange, or red, depending on the Subaru model and the severity of the technical hitch. Discover the significance of the CEL on the car’s performance and the steps to take when it illuminates.

Common Reasons for the CEL

The CEL often illuminates when the onboard diagnostic system detects a malfunction in the engine, emission control system, or transmission system. A damaged oxygen sensor may affect fuel supply to the engine, causing the CEL to illuminate. Monitoring the car’s fuel efficiency is the best way to ascertain the malfunction. If the fuel efficiency decreases considerably, you may require a new oxygen sensor. Similarly, a loose gas cap may activate the CEL on the car’s dashboard if it fails to form a tight seal over the gas tank. It happens if you don’t tighten the gas cap after a fuel refill or if the cap has cracks that allow the evaporation of fuel vapors from the tank. Tighten the cap after visiting the gas station to see if the light turns off. An illuminating CEL may also imply that the oil is dirty or there’s inadequate flow into the engine. Luckily, you can check the engine oil status using a dipstick. Schedule an oil change service at an approved Subaru dealership if the oil is dark, black, or below the recommended level. Other triggers for the Subaru CEL include:

• Catalytic converter malfunctions.
• Mass airflow sensor problems.
• Ignition system faults.

Immediate Steps When the Light Illuminates

The Subaru CEL displays in different ways to convey a unique message. While it may be challenging to identify the cause, some actionable steps will help prevent damage to the engine if the light illuminates. There are some steps you can take when the CEL illuminates.

Pull Over if the Light Is Flashing

A flashing light implies a severe malfunction, and continuing to drive may further damage the essential components. A flashing CEL is mostly a sign of engine misfire, which dumps an unburned fuel-air mixture in the exhaust system. The problem may damage the valves, catalytic converter, or exhaust system. Therefore, if the CEL flashes consistently, pull over immediately and consider having the vehicle towed to a service center.

Check the Gas Cap for Proper Closure

As mentioned, a loose gas cap is one of the causes of an illuminating CEL. Find the nearest parking lot and examine the gas cap if you’re experiencing a steady illuminating light. If it’s not damaged or cracked, consider tightening the cap and then restart the car. However, a replacement may be inevitable if you notice substantial damage or cracks.

Inspect for Noticeable Issues or Strange Noises

The CEL may illuminate steadily, but the car may have significant performance issues. For instance, you may hear a strange engine noise or notice a sharp decline in the car’s performance. You should visit a service center immediately or have the vehicle towed to avoid damaging the engine.

Continue Driving if the Light Is Steady and There Are No Unusual Symptoms

A steady CEL without unusual symptoms implies a system within the car requires attention, but it’s typically not urgent. Although the car may perform optimally, taking it to a service center is still advisable to prevent further damage. You can continue driving to your destination, but take the car to a service center soon.

Diagnostic Tools and Professional Inspection

The car’s onboard computer diagnostic system stores an error code to diagnose the fault whenever the CEL illuminates. However, retrieving and interpreting the codes requires specialized tools, in-depth automotive skills, and professional expertise. Automobile experts, therefore, recommend contacting qualified mechanics, such as the ones here at Hiley Subaru of Fort Worth in Texas, to retrieve the codes. Diagnostic tools can detect errors and locate an underlying problem before a severe breakdown. For example, if the catalytic converter operates below its efficiency, the diagnostic tool will display an error code relating to the malfunction. The mechanic will then replace the faulty component, hence preventing costly repairs. Diagnostic tools have a user interface displaying information from various components and systems. The tool is an efficient time-saver because the technician can assess the car’s general condition within minutes. Moreover, diagnostic tools can retrieve critical information from the manufacturer, including updates and notifications.

Importance of Prompt Attention

The CEL is a warning signal that something may be wrong with the car. Ignoring the light may lead to aggravation of underlying malfunctions of the engine and reduced fuel economy. It could also damage the car’s emission system and related components. Failure to take prompt action can also jeopardize your safety and passengers if the underlying malfunction affects safety equipment, such as the air bags. For this reason, your car deserves prompt attention whenever the CEL illuminates to prevent potential damage to the vehicle’s components and systems.

DIY Checks and Preventive Measures

A qualified mechanic is the best professional to handle car maintenance tasks. However, some simple DIY checks and preventive measures can help you manage the CEL before visiting a professional. For example, when the CEL illuminates, ensure the gas cap isn’t loose, as this may trigger the sensor and cause the light to illuminate. You may also check the gauges for more clues. Is the engine overheating? Or is the oil pressure below the right level? If the gauges indicate a potential problem, stop the car and seek professional assistance to prevent damages. Another preventive technique is filling the gas tank to the right level. Frequently overfilling the tank may damage the evaporative emission system, hence triggering the light to illuminate. Maintaining a regular service interval at a dealership is essential to preventing CEL triggers.

Is the CEL Essential for Your Car’s Health?

The CEL is a valuable tool for maintaining the health and longevity of Subaru vehicles. It helps identify underlying malfunctions that could become disastrous if not addressed urgently. For this reason, you should act immediately if the CEL illuminates your Subaru dashboard. Refer to the owner’s guide for more information, and contact us at Hiley Subaru of Fort Worth for expert assistance.