2016 Toyota Highlander Check Engine Light

The check engine light means the OBD-II system stored a trouble code identifying the affected system or circuit.

This can range from a loose gas cap to sensor faults, misfires, or emissions issues. On a 2016 Toyota Highlander, a code read and data review reveals where to test next, preventing guesswork. Our Murray team uses Toyota factory scan tools to see live data and freeze-frame snapshots for accurate diagnosis.

• OBD-II code narrows the system (e.g., EVAP, O2 sensor, misfire)
• Freeze-frame data shows conditions when the fault set
• Schedule diagnosis: schedule service

A steady light means drive cautiously to service; a flashing light signals a severe misfire—stop driving to avoid catalytic converter damage.

If the light is steady and the Highlander runs normally, reduce load and plan a prompt inspection. If it flashes, continuing to drive can overheat the catalyst and cause costly repairs. In Murray, you can quickly book a diagnostic with our Toyota-certified team for a clear, written next step.

• Steady = schedule soon; flashing = tow recommended
• Watch for symptoms: rough idle, power loss, fuel smell
• Book now: schedule service

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

The 3.5L V6 in the 2016 Toyota Highlander uses multiple O2 sensors and a monitored EVAP system; age, mileage, or fuel quality can trigger these faults. Our diagnostic process isolates the root cause before any part is replaced. You’ll get an estimate and options specific to your vehicle and local driving conditions.

• EVAP small leak: check/replace gas cap, smoke test system
• MAF contamination: inspect intake, test/clean/replace MAF
• Misfire: ignition coils, plugs, fuel, or vacuum leak testing

Parts stores provide a free generic OBD-II code read; our dealership performs a full diagnosis with Toyota factory scan tools and isolation testing.

A single code often has multiple potential causes. We access Toyota-specific data, bi-directional tests, and service bulletins to pinpoint the fault on your Highlander. You’ll receive a written estimate before any repair and can use current offers to manage costs.

• Factory scan tool access and guided tests
• Certified Toyota technicians and repair validation
• Check current service specials

No—clearing codes resets readiness monitors, and Utah’s OBD inspection fails vehicles with “not ready” monitors or active faults.

Simply erasing the light without fixing the cause won’t help your Highlander pass; monitors must complete self-tests during normal driving. We diagnose the issue, verify repairs, and confirm monitors are ready before you head to inspection in the Salt Lake Valley.

• Address root cause first; don’t just clear codes
• Verify readiness with a post-repair scan
• Book verification: schedule service

Larry H. Miller Toyota Murray, 5650 South State Street, Murray, UT 84107, offers factory-authorized diagnostics for the 2016 Toyota Highlander.

We serve Murray, Salt Lake City, Sandy, West Jordan, South Jordan, Millcreek, Holladay, and Taylorsville with Toyota-trained technicians and OEM equipment. Book online for a prompt appointment and review current offers before you arrive.

• Easy online booking: schedule service
• Local coverage across the Salt Lake Valley
• See savings: service specials

Your visit starts with a professional OBD-II scan using Toyota factory software to retrieve codes, freeze-frame data, and readiness status on your 2016 Toyota Highlander. Next, a technician reviews live data to confirm patterns, then performs pinpoint testing—such as smoke testing the EVAP system, checking MAF and oxygen sensor signals, coil output, or fuel trims. Findings are documented, and you receive a written estimate before any repair work proceeds. If repairs are approved, we verify the fix, clear codes, and confirm monitors are ready. To plan your visit and check current offers, use our online tools.

- Book an appointment: schedule service
- Review discounts: service specials

For the 2016 Toyota Highlander, typical codes include EVAP small leak (often a loose or failing gas cap), oxygen sensor circuit or heater faults, mass airflow (MAF) range/performance, catalytic converter efficiency (P0420/P0430), and cylinder misfire codes (P030X). EVAP leaks can trigger fuel odors and repeated lights; MAF or O2 issues affect fuel economy and drivability. Misfires left unaddressed can overheat and damage catalytic converters, increasing repair costs. Catalytic efficiency codes may be the result of upstream issues—fix root causes first to protect the catalyst. Bring your 2016 Toyota Highlander to Larry H. Miller Toyota Murray in Murray for an accurate diagnosis — schedule service.

Larry H. Miller Toyota Murray serves 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—with Toyota-specific diagnostic capability. Factory scan tools provide enhanced data and bi-directional controls that generic code readers can19t access, speeding up root-cause testing on your 2016 Toyota Highlander. Local conditions matter here: winter cold starts can surface misfire and sensor codes, and temperature swings can reveal EVAP system leaks. Visit us at 5650 South State Street, Murray, UT 84107, or book online for directions and appointment times. We19ll deliver a clear diagnosis and a written plan you can approve before any repair work begins.