Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2025 Toyota Grand Highlander?

• Typical dealer diagnostics run between $90–$150, and Nalley Toyota Union City often applies that fee toward repairs, delivering immediate savings.
• Independent shops may quote varying fees; our pricing is transparent and backed by factory-trained technicians and OEM parts for long-term savings.
• If repairs are covered under warranty, they must be performed at a certified dealership to remain warranty-valid—this protects you from unexpected long-term costs.
• We also offer service specials and will review repair options so you can weigh immediate costs against future reliability and resale value.

What does it mean when the check engine light comes on in a 2025 Toyota Grand Highlander?

• An illuminated check engine light signals the vehicle’s onboard diagnostics detected an emissions or engine performance issue—ranges from minor (loose gas cap) to serious (engine misfire).
• Our technicians use OEM-grade scanners to read fault codes and provide an accurate diagnosis, reducing the chance of unnecessary parts replacement.
• Timely dealer diagnosis often costs less overall than delayed repairs because it prevents collateral damage and preserves warranty coverage when service is performed at a certified dealership.
• We’ll explain required repairs, estimated costs, and how each option affects immediate performance and long-term ownership costs.

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

• Start with basics: ensure the gas cap is tight and the fuel cap seal is intact—this simple step often clears an EVAP-related code.
• Check fluid levels such as oil and coolant; low fluids can trigger alerts and cause damage if ignored.
• If the light remains, bring your 2025 Toyota Grand Highlander to Nalley Toyota Union City so our certified technicians can run a proper scan and advise on repairs.
• Remember: warranty-covered repairs must be completed at a certified dealership to maintain coverage and avoid long-term expense.

What is the most common reason for check engine light on a 2025 Toyota Grand Highlander?

• Common causes include loose or faulty gas caps, oxygen sensor failures, EVAP system leaks, and ignition misfires—each has different costs and consequences if left unaddressed.
• An untreated misfire can damage the catalytic converter, leading to much higher repair costs down the road.
• Our technicians diagnose the root cause quickly and recommend OEM repairs that often save money over time versus piecemeal fixes.
• Warranty and certified-dealer repairs protect you from unexpected expenses and keep long-term ownership costs lower.

How long does a check engine light service take?

• Diagnostic scans typically take 30–60 minutes; uncomplicated repairs can often be completed the same day.
• More involved issues, such as misfires or catalytic converter replacement, may require additional time for parts ordering and thorough testing—usually 1–2 days.
• Nalley Toyota Union City prioritizes accurate, lasting repairs by factory-trained technicians, which minimizes repeat visits and long-term downtime.
• We provide clear time estimates up front and highlight how dealer-performed repairs deliver immediate and long-term savings compared with short-term fixes.