Frequently Asked Questions

What is the most common reason for check engine light on a 2024 Toyota Grand Highlander?

• Faulty oxygen sensor or catalytic converter efficiency (codes like P0420) leading to poor fuel economy.
• Engine misfires (P0300 series) caused by spark, injector, or ignition issues.
• Evaporative emissions leaks (EVAP system codes) from a loose gas cap or cracked line.
• Mass airflow or manifold absolute pressure sensor faults that affect air/fuel mix.
• Bring your Grand Highlander to our service center for a precise scan — warranty-covered repairs must be completed at a certified dealership to remain valid.

How much does a check engine light diagnostic cost for a 2024 Toyota Grand Highlander?

• Diagnostics typically include a computerized scan and technician inspection to identify trouble codes and root causes.
• At Nalley Toyota Union City, our pricing is competitive; we often cost less than independent shops while offering factory-trained technicians and OEM parts.
• Immediate savings come from accurate diagnosis and avoiding unnecessary parts; long-term savings come from preserving fuel economy and preventing major failures.
• If a repair is covered by warranty, it must be performed at a certified dealership to maintain coverage and ensure correct repair procedures.

What does it mean when the check engine light comes on in a 2024 Toyota Grand Highlander?

• A steady light signals a stored code or non-critical fault; driving to our service center for evaluation is recommended.
• The light indicates the vehicle’s onboard diagnostics detected a system outside normal parameters — emission, ignition, fuel, or sensors.
• We run a full scan and explain findings, recommended repairs, and cost estimates so you can make informed decisions.
• Repairs covered under warranty should be performed at a certified dealership to protect coverage and vehicle resale value.

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

• Check the gas cap: a loose or damaged cap is a common, quick fix that can clear EVAP system codes.
• Note driving behavior and symptoms — loss of power, rough idle, or poor fuel economy — and report these to our technicians.
• A diagnostic scan at our dealership will retrieve codes and guide accurate repairs; this prevents wasted expense on guesswork.
• Remember: warranty-covered repairs must be completed at a certified dealership to preserve protection and ensure proper parts and labor.

How long does a check engine light service take?

• Basic code retrieval and inspection can take 30–60 minutes; more complex diagnosis and testing may require additional time.
• If a simple repair is needed, many jobs can be completed the same day; larger repairs may require parts and extended scheduling.
• We prioritize efficiency with transparent timelines — our factory-trained techs use OEM procedures to minimize rework and long-term costs.
• For warranty work, scheduling at a certified dealership ensures correct procedures and faster authorization when applicable.