Frequently Asked Questions

What is the first thing to check when the check engine light comes on in a 2021 Toyota Highlander Hybrid?

• Check for obvious signs: loose or missing gas cap, recent refueling, or dashboard alerts that accompany the light.
• Inspect visible hoses and fluid levels—sometimes a simple visual check prevents unnecessary diagnostics.
• If nothing is obvious, bring the vehicle to Nalley Toyota Union City for a fast scan; our factory-trained technicians confirm the root cause with OEM-grade scanners.
• Remember: any warranty-covered repairs must be performed at a certified dealership to protect coverage and long-term value.

How long does a check engine light service take?

• Basic code retrieval and visual inspection typically take 30–60 minutes.
• Comprehensive diagnostics, drive cycles, and component testing usually take 1–3 hours depending on symptoms.
• If parts or deeper inspections are required, we provide an accurate estimate and timeline before work begins.
• We often complete jobs faster than independent shops because our factory tools and training reduce repeat visits and save you time and money.

What does it mean when the check engine light comes on in a 2021 Toyota Highlander Hybrid?

• It indicates the vehicle’s onboard diagnostics detected a fault in emissions, ignition, fuel, or related systems—not always a major failure.
• Common causes range from an EVAP leak or oxygen sensor to misfires or catalytic converter issues; only a scan reveals the code.
• Early diagnosis prevents escalation; dealership diagnostics identify and repair problems under warranty when applicable.
• Choosing our dealership often costs less than independent shops over time due to accurate diagnostics, genuine parts, and fewer follow-up repairs.

How much does a check engine light diagnostic cost for a 2021 Toyota Highlander Hybrid?

• Diagnostic scan prices vary by market, but many dealerships offer competitive scan fees or service specials—check our Service Specials page for current pricing.
• Most scans are affordable and typically lower than the total cost of trial-and-error repairs at independent shops.
• If a repair is needed, we provide a clear written estimate; repairs under warranty must be completed at a certified dealership to maintain coverage.
• Our certified technicians and OEM parts deliver immediate and long-term savings by preventing repeated visits and protecting resale value.

What is the most common reason for check engine light on a 2021 Toyota Highlander Hybrid?

• Frequent causes include EVAP system leaks (loose gas cap or small vapor leaks), oxygen sensors, and occasional ignition or fuel system misfires.
• Hybrid-specific systems—battery management or emission control sensors—can also trigger codes; precise scanning isolates the subsystem.
• Addressing codes early at Nalley Toyota Union City reduces repair costs and avoids catalytic converter damage or drivability issues.
• Warranty-covered repairs should be performed at a certified dealership to ensure proper parts, labor, and long-term protection.