Frequently Asked Questions

What is the most common reason for check engine light on a 2026 Toyota Highlander?

• Loose or damaged gas cap — the simplest and most frequent cause, often fixed quickly and inexpensively.
• Oxygen sensor or catalytic converter issues — common over time; unresolved, they raise emissions and fuel costs.
• Evaporative (EVAP) system leaks — small cracks or loose fittings can trigger codes and cause emissions failures.
• Spark plugs or ignition coils — misfires produce drivability problems and can damage the catalytic converter if ignored.
• Professional diagnostics at our dealership prevent misdiagnosis and usually cost less up front and over time than repeated independent repairs.

What does it mean when the check engine light comes on in a 2026 Toyota Highlander?

• It indicates the vehicle’s onboard diagnostics detected a fault in emissions, engine, or powertrain systems.
• Codes range from minor (EVAP leak, loose gas cap) to serious (misfire, catalytic converter inefficiency).
• A steady light usually signals a non-emergency issue; a flashing light typically signals a severe misfire that needs immediate attention.
• Early dealership diagnostics reduce repair complexity and preserve warranty coverage — warranty repairs must be done at a certified dealership.
• Our factory-trained technicians use OEM tools to accurately read codes and recommend cost-effective solutions that save you money long term.

What is the first thing to check when the check engine light comes on?

• Check the gas cap: ensure it’s tight and undamaged; a loose cap is a common, quick fix.
• Note any changes: unusual sounds, loss of power, smells, or dashboard warnings that accompany the light.
• If the light is flashing or performance is poor, stop driving and have the vehicle inspected immediately to avoid further damage.
• For peace of mind and warranty protection, bring the vehicle to Nalley Toyota Union City — certified dealers ensure covered repairs are performed correctly.
• Using our service links makes scheduling easy: new inventory, service specials, or trade options are available on our site.

How much does a check engine light diagnostic cost for a 2026 Toyota Highlander?

• Diagnostic scan fees typically range from a modest flat rate to about what independent shops charge, but our dealership frequently delivers lower total cost due to accurate diagnosis and fewer repeat visits.
• Identifying the true cause up front avoids unnecessary parts and labor — immediate savings — and prevents expensive downstream repairs, creating long-term savings.
• If the repair is covered by warranty, it must be completed at a certified dealership to remain valid; our factory-trained technicians handle warranty claims efficiently.
• We use OEM parts and manufacturer tools, reducing the chance of comebacks and giving better resale value for your Highlander.
• Contact Nalley Toyota Union City to schedule a precise diagnostic and receive transparent pricing before work begins.

How long does a check engine light service take?

• Basic diagnostics typically take 30–90 minutes depending on code complexity and whether test drives or live-data checks are needed.
• Minor fixes like tightening or replacing a gas cap can be resolved the same visit; more involved repairs (oxygen sensor, catalytic converter, ignition components) take longer.
• Our dealership’s factory-trained technicians and on-site parts inventory speed repairs and reduce downtime.
• If warranty work is needed, certified-dealership service ensures proper documentation and authorized parts, protecting long-term coverage.
• We provide an estimated completion time upfront and prioritize transparent communication to get you back on the road with minimal delay.