2016 Toyota Highlander-Hybrid Check Engine Light

It means the OBD-II system detected a fault and stored a code, such as P0442 (small EVAP leak), P0300 (misfire), or P0420 (catalyst efficiency).

Your 2016 Toyota Highlander Hybrid uses sensors and modules to monitor engine and emissions performance. When something falls outside expected ranges, the system turns on the light and saves a diagnostic trouble code (DTC). Our team in Peoria pulls live data and freeze-frame info to identify the actual cause behind the code, which can range from a loose gas cap to a failing oxygen sensor.

• Codes point to systems, not guaranteed failed parts
• Hybrid systems add additional data streams Toyota tools can read
• Schedule a professional scan: schedule service

Frequent causes include EVAP leaks (P0442/P0455), oxygen sensor faults (P0136/P0156), MAF issues (P0101), misfires (P0300–P0306), and catalytic converter efficiency (P0420).

On the 2016 Toyota Highlander Hybrid, small EVAP leaks are often triggered by loose or worn gas caps, while aging sensors can skew fuel trims. Misfires can result from spark plugs, coils, or fuel quality. Leaving these unchecked may reduce fuel economy or damage the catalytic converter, increasing repair costs over time.

• Inspect/replace gas cap if EVAP codes appear
• Address misfires promptly to protect the catalyst
• Get a full diagnostic in Peoria: schedule appointment

If the light is flashing, stop driving and arrange a tow; if it’s steady, drive gently to a service facility as soon as possible.

A flashing light on a 2016 Toyota Highlander Hybrid usually signals an active misfire that can quickly overheat and damage the catalytic converter. A steady light often points to emissions or sensor issues, which are less urgent but still require prompt diagnosis. In Peoria, you can head directly to Larry H. Miller Toyota Peoria for a scan and inspection.

• Flashing = potential misfire/catalyst damage risk
• Steady = drive cautiously; avoid high loads
• Book a diagnostic now: schedule service

Parts stores read generic codes, while our Toyota Techstream tools and OEM-trained techs test the root cause with manufacturer data.

A free code read is just a starting point—DTCs can have multiple causes. At Larry H. Miller Toyota Peoria, we access live Toyota-specific data, perform guided tests, and verify the actual fault before any repair. You’ll receive a written estimate and can review current service specials before approving work.

• Toyota Techstream access for hybrid modules and proprietary data
• Isolation testing confirms cause, not just the symptom
• Clear estimate prior to repair authorization

No—Arizona inspections check OBD-II readiness; recently cleared codes set monitors to “not ready,” which will fail.

Simply erasing the light on a 2016 Toyota Highlander Hybrid does not fix the issue and resets self-tests the state reads during emissions. The correct approach is diagnosing and repairing the underlying fault, then completing a normal drive cycle until monitors are ready. Our Peoria team can confirm readiness before you test.

• OBD-II readiness must be “ready” with no active DTCs
• Drive cycle completion is required after repair
• Get verified results: schedule appointment

A flashing light indicates an active misfire that can overheat and damage the catalytic converter within minutes.

When the light flashes on a 2016 Toyota Highlander Hybrid, continued driving can increase repair costs by harming the catalyst. Safest next steps are to reduce load, pull over, and arrange a tow to our Peoria service center. We’ll scan for misfire codes (e.g., P0300–P0306) and perform coil, plug, and fuel checks.

• Flashing = stop driving; arrange towing
• Misfire diagnostics protect the catalyst
• Book help now: schedule service

For your 2016 Toyota Highlander Hybrid, our diagnostic begins with an initial OBD-II scan using Toyota Techstream to capture active and pending codes and pull freeze-frame data. A technician reviews live data to see how sensors behaved when the fault occurred. Next, we perform isolation testing—such as smoke testing for EVAP leaks, circuit checks for sensors, or ignition tests for misfires—to verify the root cause. Before any repair, you receive a written estimate outlining the findings and options. If you want to time service with current offers, check our service specials. Ready to move forward? Schedule service online at your convenience.

LHM Toyota Peoria serves the Phoenix West Valley and Greater Phoenix metro area—including Peoria, Glendale, Surprise, Sun City, Avondale, Scottsdale, and Phoenix—with Toyota-specific diagnostic capability. For the 2016 Toyota Highlander Hybrid, our factory scan tools read hybrid control modules and capture freeze-frame data that generic readers miss. That accuracy matters in Arizona, where heat and refueling habits commonly expose EVAP leaks and sensor drift. Whether your light is steady or flashing, we’ll verify the concern, explain the cause, and outline next steps with a clear estimate. Find us off Loop 101 at 8633 W Bell Rd, Peoria, AZ 85382. Questions or ready to book? Schedule an appointment today.

Owners of the 2016 Toyota Highlander Hybrid often encounter EVAP codes like P0442 (small leak) or P0455 (large leak), which may stem from a loose or worn gas cap or a line leak. Misfire codes P0300–P0306 point to ignition or fuel delivery issues that, if ignored, can overheat and damage the catalytic converter. P0101 indicates mass air flow sensor performance concerns, while P0420 flags reduced catalyst efficiency that can impact emissions and drivability. Addressing these early typically keeps repair costs lower and fuel economy stable. Bring your 2016 Toyota Highlander Hybrid to Larry H. Miller Toyota Peoria in Peoria for an accurate diagnosis — schedule service.