Frequently Asked Questions

What does it mean when the check engine light comes on in a 2023 Toyota Highlander?

• It indicates the vehicle’s onboard diagnostics detected an issue with emissions, engine performance, or a related sensor. Common triggers include oxygen sensors, catalytic converter faults, or loose fuel caps.
• At Herb Chambers Toyota of Boston we diagnose the underlying code quickly with factory-grade tools to avoid unnecessary repairs and protect long-term value.
• We often cost less than independent shops while offering factory-trained technicians, OEM parts, clear estimates, and the confidence of warranty-backed repairs.
• If a repair is covered under warranty, it must be done at a certified dealership to preserve coverage—our technicians are Toyota-certified and experienced with the 2023 Toyota Highlander.
• To get expert diagnosis, you can schedule service online now or see our current service specials for savings.

How long does a check engine light service take?

• Most diagnostics take about 30–90 minutes depending on whether a visual inspection and road test are required to reproduce the issue.
• If additional parts or deeper diagnostics are needed, we’ll provide a transparent estimate and timeline before any work begins.
• Herb Chambers Toyota of Boston prioritizes speed and accuracy—same-day or next-day service is common due to our parts availability and certified staff.
• We offer service financing so you can get needed repairs now and pay over time, helping you avoid prolonged downtime or compounding damage.
• Ready to book? Click to schedule service or review our service specials for discounts.

How much does a check engine light diagnostic cost for a 2023 Toyota Highlander?

• Diagnostics vary by region, but our transparent pricing provides strong value; many customers find that dealership diagnostics and repairs deliver immediate and long-term savings through accurate fixes and OEM parts.
• Herb Chambers Toyota of Boston offers clear estimates and will explain options—repairing the right component the first time avoids repeated trips and higher cumulative costs.
• We frequently run service promotions that lower diagnostic or repair costs—check our service specials before booking.
• Remember: warranty-covered repairs must be completed at a certified dealership to maintain coverage and ensure quality; our team will guide you through warranty confirmation.
• To get an accurate price and appointment, please schedule service online or call our service center for immediate assistance.

What is the most common reason for check engine light on a 2023 Toyota Highlander?

• Common causes include a loose gas cap, failing oxygen sensor, ignition coil or spark plug issues, and catalytic converter performance—each affects fuel efficiency and emissions.
• If left unaddressed, these issues can reduce fuel economy, increase emissions, and cause more costly repairs down the road.
• Our certified technicians use Toyota-specific diagnostics to pinpoint the issue and recommend the most cost-effective repair with OEM parts for lasting results.
• Choosing Herb Chambers Toyota of Boston often means faster repairs, genuine parts, and warranty protection that independent shops can’t always match.
• Find current offers on maintenance when you review our service specials, and schedule service to protect your Highlander’s performance.

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

• Start with the fuel cap: a loose or damaged cap can trigger an emissions-related code. Tighten it and see if the light clears after a few drives.
• If the light persists, professional diagnostics are the safest next step—Herb Chambers Toyota of Boston can read your codes and explain repair urgency and cost.
• We emphasize transparency: you’ll receive a clear estimate, OEM parts, and certified technician work that helps avoid repeat failures and long-term expense.
• Service financing is available so necessary repairs aren’t delayed; warranty work must be completed at a certified dealership to remain valid.
• Ready to confirm the issue? Click to schedule appointment with our service center or browse our service specials.

2023 Toyota Highlander Check Engine Light Reset

Resetting the check engine light on a 2023 Toyota Highlander can seem simple, but it should be paired with a proper diagnosis to ensure the underlying fault is resolved and will not recur. At Herb Chambers Toyota of Boston our approach begins with a thorough scan using Toyota-certified tools that read manufacturer-specific codes, pending freeze-frame data, and live sensor readings. Technicians then perform a targeted inspection—checking fuel cap condition, exhaust and emissions components, ignition system health, and any related wiring or connectors. A premature reset without repair can mask an intermittently failing component, leading to repeat trips and greater expense over time. By using OEM parts and factory procedures, we provide transparent estimates, documented repairs, and warranty-backed service that preserve your vehicle’s longevity. Customers appreciate our clarity: we explain why a reset is or isn’t appropriate, outline immediate and long-term cost benefits, and, when ready, make it easy to schedule service. Also review our current service specials to maximize savings while protecting your Highlander.

2023 Toyota Highlander Check Engine Light Codes

The most common check engine codes for a 2023 Toyota Highlander include P0420 (catalyst system efficiency), P0171/P0174 (lean condition), P0130-P0167 (oxygen sensor circuits), and misfire codes like P0300-P0304. Each code points to specific risks: a P0420 left unrepaired can reduce fuel efficiency, fail emissions tests, and eventually damage the catalytic converter—an expensive repair. Lean codes (P0171/P0174) often indicate vacuum leaks or fuel delivery problems that reduce performance and can strain the engine if ignored. Oxygen sensor faults give inaccurate air–fuel readings that lower MPG and increase wear. Herb Chambers Toyota of Boston in Boston, MA provides fast, accurate diagnosis using OEM diagnostic procedures and genuine Toyota parts to prevent cascading failures. Our certified techs explain repair options, price impacts of delaying service, and how timely repairs at our dealership often cost less over time than repeated fixes. Check for available incentives via our service specials, and schedule service for a transparent inspection and repair plan that keeps your Highlander reliable.

Check Engine Light Flashing

A flashing check engine light on a 2023 Toyota Highlander signals a serious misfire or condition that could immediately damage the catalytic converter. When the light flashes, stop driving as soon as it is safe and have the vehicle inspected by professionals—continuing to drive risks costly downstream repairs. At Herb Chambers Toyota of Boston we treat flashing lights as high priority: factory-trained technicians perform an expedited diagnostic to identify misfires, ignition faults, or fuel system issues and then recommend the fastest, most reliable repair path. We offer OEM parts, warranty-backed workmanship, and service financing so urgent repairs can be completed immediately without undue financial strain. For cost-conscious owners, our service specials help reduce out-of-pocket expense while preserving vehicle life. If you see a flashing light, contact us and schedule service right away—our team will prioritize safety, minimize downtime, and restore your Highlander’s performance with clear communication and dependable results.