2017 Toyota Highlander Check Engine Light

It means the engine computer stored an OBD-II fault code identifying the system that needs attention.

Your Highlander’s ECM turns on the light when sensors detect a problem—anything from a loose gas cap (EVAP leak) to a misfire or catalytic converter efficiency issue. A quick code read points to the system, and a proper diagnostic confirms the root cause. In Murray, our Toyota tools read manufacturer data, freeze-frame conditions, and pending codes for a precise next step.

• Light on = at least one stored or pending OBD-II code
• Systems commonly flagged: EVAP, ignition, fuel/air, catalytic converter
• Next step: schedule a full diagnostic to confirm the cause

Typical causes include EVAP leaks (loose gas cap), oxygen sensor faults, misfire codes, MAF issues, and catalytic converter efficiency codes.

On the 3.5L V6 Highlander, a loose or worn gas cap can set an EVAP code, while aged O2 sensors or unmetered air can affect fueling and trigger the light. Misfires (spark plugs, coils, or fuel delivery) left unchecked risk converter damage. Our Murray team confirms which component failed—not just the system—before recommending repairs.

• Common codes: P0455/P0442 (EVAP), P013x/P015x (O2), P0300–P0306 (misfire), P0101 (MAF), P0420 (catalyst)
• Root-cause testing prevents part-swapping and repeat lights
• Schedule a diagnostic: schedule service

A flashing light signals a severe misfire; a steady light means a non-urgent fault—drive cautiously to service.

If the light is flashing, stop driving to avoid catalytic converter damage and potential power loss. A steady light typically allows short, careful trips, but you should diagnose it soon to protect fuel economy and emissions systems. In the Salt Lake Valley, schedule a visit in Murray to prevent a minor issue from becoming a major repair.

• Flashing = tow or stop; steady = cautious driving to service
• Misfires can overheat and ruin the catalytic converter
• Book now: schedule service

Parts stores read a generic code; our Toyota Techstream accesses manufacturer data, runs guided tests, and confirms the exact failed part.

A code (like P0420) names a system, not the cause—multiple faults can trigger the same code. Dealer diagnostics add freeze-frame analysis, smoke/pressure tests for EVAP, live-data monitoring, and technical service bulletin checks. You’ll leave our Murray service drive with verified findings and a written estimate before any repair.

• Factory scan tool + Toyota service information
• Isolation testing to confirm the failing component
• Clear results and next steps in writing

No—Utah OBD inspections fail if monitors aren’t ready or a fault returns after a reset.

Clearing codes erases readiness monitors; your Highlander must complete drive cycles before a test can pass. If the underlying issue persists, the light and code will come back. Our Murray team can diagnose and repair the fault, then verify monitors are ready before you head to testing.

• Clearing codes ≠ repair; monitors must be “ready”
• We can verify monitor status after repairs
• Check service specials before you book

You can schedule at Larry H. Miller Toyota Murray, 5650 South State Street, Murray, UT 84107.

We serve the Greater Salt Lake City metro, including Sandy, West Jordan, South Jordan, Millcreek, Holladay, and Taylorsville. Our Toyota-trained technicians use factory equipment for accurate results and a clear repair plan. Book online and arrive knowing we’ll provide findings and options before any work begins.

• Easy online booking: schedule service
• Review current offers: service specials
• Dealer-authorized diagnostics and repairs

Drivers across the Salt Lake Valley rely on our Murray location for precise 2017 Toyota Highlander check engine diagnostics. We serve Murray, Salt Lake City, Sandy, West Jordan, South Jordan, Millcreek, Holladay, and Taylorsville with Toyota Techstream capability that goes well beyond a generic OBD-II code reader. Winter cold snaps and rapid temperature swings can surface EVAP and cold-start issues; our team reviews freeze-frame data to see exactly when and how the fault occurred. As the original Larry H. Miller dealership opened in 1979, we pair local know-how with manufacturer procedures to isolate the root cause efficiently. Ready to move forward? Use our online scheduler for directions and appointment options, or review current offers before you arrive.

Our process starts with an initial OBD-II scan to capture all stored, pending, and permanent codes, followed by a review of freeze-frame data to understand the conditions that set the light. We then perform targeted isolation testing—such as smoke/pressure testing for EVAP leaks, ignition and fuel checks for misfires, and live-data analysis for MAF/O2 concerns. Next, we verify the fault, document findings, and provide a written estimate before any repair work begins. If Toyota warranty coverage applies, repairs generally must be performed at a certified facility to protect your coverage. When you’re ready, book online to lock in a time that works for you and see current offers.

Schedule service or explore service specials before your visit.

On the 2017 Toyota Highlander, you may encounter codes such as P0455/P0442 (EVAP leak, often a loose or worn gas cap), P0300–P0306 (random/cylinder-specific misfires), P0101 (MAF range/performance), P013x/P015x (oxygen sensor performance), and P0420 (catalyst efficiency). Each points to a system, not a guaranteed failed part—confirmation testing prevents unnecessary replacements. Ignoring misfire or fueling faults can overheat and damage the catalytic converters, dramatically increasing repair costs. EVAP leaks left unresolved may lead to repeated inspection failures. For clear answers and peace of mind, bring your 2017 Toyota Highlander to Larry H. Miller Toyota Murray in Murray for an accurate diagnosis — schedule service.