2027 Toyota Highlander Check Engine Light in Murray, UT

It means the OBD-II system stored a diagnostic trouble code (DTC) that points to a system—such as EVAP, oxygen sensor, misfire, or emissions control—that needs diagnosis.

Your Highlander’s computer turns the light on when it detects a fault and saves freeze‑frame data. Our Toyota-focused scan tools read the DTC and related live data to pinpoint the underlying cause, not just the code label. If the light is steady, drive calmly to service; if flashing, stop to prevent catalytic converter damage. Book a visit with our Murray team and schedule an appointment.

• OBD-II codes identify systems, not guaranteed failed parts
• Freeze-frame data helps reproduce the fault conditions
• Factory diagnostics reduce guesswork and repeat visits

Typical causes include EVAP leaks (loose gas cap), oxygen sensor faults, mass airflow (MAF) issues, misfires (plugs/coils), and catalytic converter efficiency codes.

These faults are common across modern Toyota SUVs and can be triggered by temperature swings, fuel quality, or component wear. In the Salt Lake Valley, seasonal changes can aggravate EVAP seals and cold-start misfires. Our Murray service team confirms the root cause before repairs and provides a written estimate. Check current service specials for potential savings.

• Loose or faulty gas cap can set EVAP small/large leak codes
• MAF contamination affects fuel trim and drivability
• Ignoring misfires risks catalytic converter damage

A steady light usually allows cautious driving to service, but a flashing light means a severe misfire—stop driving to avoid catalytic converter damage.

If the light is steady and the Highlander feels normal, reduce load and schedule a diagnosis soon. If flashing or the SUV runs rough, tow it to prevent costly repairs. In Murray and the Greater Salt Lake City area, our team can assess it quickly and advise next steps—use our online tool to schedule service.

• Flashing light = potential raw-fuel damage to the catalyst
• Steady light = non-urgent but should be checked promptly
• Monitor changes in power, idle quality, and fuel economy

Parts stores read generic codes for free; a Toyota dealer performs full diagnosis with Toyota Techstream, guided tests, and a written estimate to find the true cause.

Many codes have multiple root causes—replacing the first suggested part can waste time and money. At Larry H. Miller Toyota Murray, factory-trained technicians access Toyota-specific data, run isolation testing, and verify the fix. You’ll get findings documented before any repair, and you can review service specials online.

• Toyota Techstream access for OEM data and bidirectional tests
• Guided diagnostics confirm cause instead of guessing
• Written estimate provided before repairs begin

No—resetting clears codes and sets monitors to “not ready,” and Utah inspections require readiness monitors to be complete with no active faults.

After clearing, your Highlander must complete specific drive cycles so the OBD-II monitors run and pass. If an underlying issue remains, the light will return and the vehicle will fail. Our Murray service team can diagnose, repair, and confirm readiness; when you’re set, schedule an appointment to verify monitors are ready.

• “Not ready” monitors lead to immediate test failure
• Proper repair prevents the light from returning
• Drive cycles differ by system and conditions

Larry H. Miller Toyota Murray at 5650 South State Street, Murray, UT 84107 provides factory-level diagnostics for the 2027 Toyota Highlander.

We serve the Salt Lake Valley, including Sandy, West Jordan, South Jordan, Millcreek, Holladay, and Taylorsville. Our OEM-certified team uses Toyota Techstream to read codes, analyze data, and confirm the fix. Book a convenient time now—use our online portal to schedule service and check service specials before you arrive.

• Central Murray location with easy valley access
• Factory-trained Toyota technicians
• Up-front findings and a written estimate

We start your 2027 Toyota Highlander with an initial OBD-II scan to capture current and stored DTCs. Next, our technicians review freeze-frame data and live parameters to understand the exact conditions when the fault set. We then perform targeted isolation testing—such as smoke testing for EVAP leaks, circuit checks, or sensor verification—to confirm the root cause before recommending repairs. You will receive a clear, written estimate and repair plan so you can decide with confidence. To lock in a time that works for you, please schedule service online. You can also review current service specials before your visit.

Larry H. Miller Toyota Murray is the flagship Toyota dealership serving the Salt Lake Valley and Greater Salt Lake City metro area—including Murray, Salt Lake City, Sandy, West Jordan, South Jordan, Millcreek, Holladay, and Taylorsville. Dealer-level tools read Toyota-specific data that generic OBD-II readers can’t access, enabling faster, more accurate results. Utah’s seasonal temperature swings can reveal EVAP leaks and increase cold-start misfire flags; we interpret these conditions using OEM procedures. Visit us at 5650 South State Street, Murray, UT 84107, or schedule an appointment online. For current offers, see our service specials, then head in for an efficient, fact-based diagnosis.

Several OBD-II codes appear frequently on the 2027 Toyota Highlander. P0442/P0455 typically indicate small or large EVAP system leaks (often a loose cap or worn seals). P0138/P0158 point to oxygen sensor circuit issues that can skew fuel trims. P0101 suggests a mass airflow sensor range/performance fault, while P0300–P0306 indicate random or cylinder-specific misfires. P0420 signals catalytic converter efficiency below threshold. Ignoring misfires or sensor faults can overheat and damage the catalyst—an expensive repair. Bring your 2027 Toyota Highlander to Larry H. Miller Toyota Murray in Murray for an accurate diagnosis — schedule service.