When both the check engine light and traction control light illuminate in your Subaru, it can indicate a variety of issues that require attention. Understanding what these lights mean and how to address them is crucial for maintaining your vehicle's performance and safety.

Understanding the Warning Lights

The check engine light signals that the vehicle's onboard diagnostics system has detected an issue. This could range from a loose gas cap to more serious engine problems.

The traction control light typically activates when the system is working to maintain traction on slippery surfaces. However, if it remains on alongside the check engine light, it may suggest a malfunction in the traction control system or a related issue.

Common Causes

Several factors can trigger both lights to activate simultaneously:

  • Faulty Oxygen Sensor: This can affect fuel efficiency and emissions.
  • Malfunctioning Mass Airflow Sensor: This impacts engine performance and fuel mixture.
  • Transmission Issues: Problems with the transmission can cause both lights to illuminate.
  • Wheel Speed Sensors: If these sensors are faulty, they can trigger traction control issues.
  • Engine Misfire: This can lead to a range of performance problems.

Recommended Actions

If you find both lights on, consider taking these steps:

  • Check for Diagnostic Codes: Use an OBD-II scanner to retrieve error codes.
  • Inspect Gas Cap: Ensure it’s tight; a loose cap can trigger the check engine light.
  • Visit a Mechanic: If codes indicate serious issues, professional diagnosis is essential.
  • Monitor Vehicle Performance: Pay attention to any changes in driving behavior.

FAQs About Subaru Check Engine Light and Traction Control Light

    • What should I do if both lights come on?
      Check for diagnostic codes and inspect the gas cap. If issues persist, consult a mechanic.

    • Can I drive my Subaru with these lights on?
      It's advisable to avoid driving until you understand the cause, as it may affect performance and safety.

    • How much does it cost to fix these issues?
      Costs vary widely based on the underlying problem; diagnostics typically range from $100 to $200.