Frequently Asked Questions

What does it mean when the check engine light comes on in a 2018 Toyota Highlander?

• It signals a monitored emissions, fuel, ignition, or sensor issue. The light covers everything from a loose gas cap to oxygen sensor or catalytic converter faults.
• Our certified technicians at Larry H. Miller American Toyota Albuquerque perform a complete scan to identify codes, interpret results, and explain options clearly so you understand immediate and long-term savings by repairing issues early.
• Repairs covered under warranty must be performed at a certified dealership to preserve coverage; we honor OEM warranties and back work with transparent documentation.
• We offer service financing so you can get service now and pay later—helpful for unexpected repairs and replacements.
• To get an accurate diagnosis and prioritized repair plan, schedule service with our service team online.

How long does a check engine light service take?

• Most diagnostic scans are completed within one visit—typically 30 to 90 minutes depending on code complexity and test requirements.
• If battery replacement or parts are needed, many jobs are finished the same day thanks to our parts inventory and quick-lane capability.
• We emphasize speed plus accuracy: factory-trained technicians use Toyota-specific tools to diagnose and repair efficiently, saving you time and money over repeated visits.
• Check our service specials for bundled offers that can reduce out-of-pocket costs and increase long-term value.

How much does a check engine light diagnostic cost for a 2018 Toyota Highlander?

• Diagnostic prices vary with issue complexity; our dealership pricing is competitive and often costs less than independent shops while delivering higher value with OEM parts and factory expertise.
• Immediate savings come from accurate diagnosis that avoids unnecessary part swaps; long-term savings come from preserving fuel economy and preventing bigger repairs.
• We provide clear estimates before work begins and we offer service financing so you can address needs today and pay over time.

What is the most common reason for check engine light on a 2018 Toyota Highlander?

• Common causes include a loose or damaged gas cap, failing oxygen sensors, catalytic converter issues, or ignition misfires; each has distinct symptoms and repair paths.
• Left unaddressed, these issues can reduce fuel efficiency, increase emissions, and lead to expensive catalytic converter or engine damage.
• Our certified team identifies root causes quickly and explains costs and warranties so you can make informed choices that protect vehicle longevity.

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

• Start with a visual and simple check: tighten the gas cap, inspect for obvious battery or charging issues, and note any drivability changes.
• Then bring your 2018 Toyota Highlander to Larry H. Miller American Toyota Albuquerque for a professional scan — DIY resets can mask serious problems.
• To avoid unnecessary costs and preserve warranties, schedule service with our certified technicians who will provide a clear repair plan and options, including available service specials.

Check Engine Light Flashing

A flashing check engine light on your 2018 Toyota Highlander can indicate an active misfire or other condition that may damage the catalytic converter if driven long. In Albuquerque, Larry H. Miller American Toyota Albuquerque treats flashing lights as urgent: our team performs a prioritized diagnosis to identify ignition faults, fuel delivery problems, or sensor failures that cause immediate risk. We begin with a comprehensive scan, live-data review, and targeted tests to isolate the failing system. Because a flashing light often signals possible engine damage, our approach minimizes time to repair by using OEM parts and proven repair sequences. Customers benefit from transparent estimates, documented test results, and an explanation of immediate versus longer-term repairs so they can choose the right path. We also highlight any applicable warranties and remind customers that warranty-covered repairs must be completed at a certified dealership to remain valid. Take advantage of our service financing to address urgent repairs without delay, and check our service specials for current offers that reduce cost while preserving performance. To protect your engine and catalytic converter, schedule service online now—our team in Albuquerque is ready to inspect and restore your Highlander with speed and care.

2018 Toyota Highlander Check Engine Light Reset

Resetting the check engine light on a 2018 Toyota Highlander may be simple, but the right course is a full diagnostic to confirm the underlying cause. At Larry H. Miller American Toyota Albuquerque we discourage blind resets; instead, our technicians scan codes, clear them only after addressing root causes, and document repairs. This ensures repeated issues don’t escalate into costly repairs or affect fuel economy. Choosing our dealership guarantees OEM-quality parts, Toyota-trained technicians, and transparent pricing that often results in lower long-term costs compared with repeated independent fixes. We honor warranties and make sure any warranty-covered work is performed by certified professionals to protect your coverage. Additionally, we provide clear service timelines and financing options if needed, and bundle savings through periodic service specials. For convenience, use our online scheduler to schedule appointment—we’ll inspect, advise, and carry out any resets only when it’s safe and correct to do so, ensuring your Highlander runs reliably for miles to come.

2018 Toyota Highlander Check Engine Light Codes

Common codes for the 2018 Toyota Highlander include oxygen sensor failures (P0130–P0167), catalytic converter efficiency (P0420), and misfire codes (P0300–P0306). Each code carries potential costs if ignored: oxygen sensor issues degrade fuel economy and may lead to catalytic converter wear; catalytic converter faults can be expensive if allowed to worsen; misfires can cause immediate engine damage and reduced performance. At Larry H. Miller American Toyota Albuquerque we interpret codes in context—combining live data, smoke tests, and targeted inspections to recommend the most cost-effective, lasting repair. Our certified technicians use Toyota-specific diagnostics and OEM parts to avoid repeat visits. For customers, this means immediate savings by fixing the true cause rather than swapping parts unnecessarily, and long-term savings through restored efficiency and reliability. We also provide clear warranty information and encourage customers to use our service financing when needed. For current discounts, see our service specials, and schedule service online to get a fast, professional diagnostic from our Albuquerque team.