2015 Toyota Highlander Check Engine Light

Up-front diagnostic pricing is provided after an initial scan and inspection at Larry H. Miller Toyota Murray, and the diagnostic fee is often credited toward the repair.

Costs depend on the confirmed fault (for example, an EVAP leak vs. a misfire). Our Toyota-certified team in Murray uses factory Techstream software to access Toyota-specific data and perform pinpoint testing before presenting a written estimate. Check our current service specials for potential savings and schedule service to lock in a time.

• Factory scan tool access (Toyota Techstream)
• Isolation testing to confirm the root cause
• Written estimate prior to any repair

It means the engine or emissions system stored an OBD-II fault code identifying a specific system or sensor that needs attention.

The issue could be minor, like a loose gas cap (EVAP), or more serious, such as a misfire or catalytic converter efficiency problem. On a 2015 Toyota Highlander, reading the code and freeze-frame data guides accurate next steps. If the light is steady, drive cautiously to service; if it’s flashing, stop driving to avoid potential catalytic converter damage.

• Steady light: schedule diagnosis soon
• Flashing light: potential misfire — stop driving
• OBD-II code points to the affected system

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

These categories cover most check engine light complaints on a 2015 Toyota Highlander. Left unresolved, misfires can overheat and damage the catalytic converter, while EVAP leaks typically impact emissions readiness. A dealer-level diagnostic in Murray pinpoints which part within these systems is actually failing before parts are replaced.

• EVAP leak (e.g., P0442) — check cap and lines
• O2/AF sensor faults (e.g., P0137/P0138)
• MAF range/performance (e.g., P0101)

Yes if the light is steady and the vehicle runs normally; no if the light is flashing, which signals a severe misfire that can damage the catalytic converter.

For a steady light in Murray, plan a prompt diagnostic to prevent secondary damage and emissions failures. If performance is rough or the light flashes, safely stop and arrange service. Our technicians can verify whether it’s a simple EVAP issue or a drivability fault that risks costly repairs on your 2015 Toyota Highlander.

• Steady light: reduce load, schedule diagnosis
• Flashing light: stop driving, tow if needed
• Protect the catalytic converter from misfire damage

A parts store reads the code; our dealership diagnoses the cause using Toyota Techstream data, isolation testing, and a written estimate.

Codes have multiple possible causes, and guessing can waste time and money. In Murray, our Toyota-certified technicians access proprietary data and run pinpoint tests to confirm the fault on your 2015 Toyota Highlander before recommending repairs. You’ll receive clear findings and up-front pricing, with many diagnostic fees applied toward the repair.

• Factory scan tool + live data and freeze-frame
• System-specific testing to confirm the root cause
• Up-front estimate with no parts cannon

No—resetting clears monitors; Utah inspections typically require readiness monitors to be complete with no active faults.

After a reset, your 2015 Toyota Highlander must complete specific drive cycles so emissions monitors report “ready.” If the underlying issue remains, the light will return or monitors won’t set, leading to a failed test. A proper diagnostic and verified repair in Murray ensures monitors complete and helps avoid re-test delays.

• Clear codes = monitors reset to “not ready”
• Drive cycle needed before testing
• Fixing the root cause prevents return faults

We start with an initial OBD-II scan on your 2015 Toyota Highlander and capture freeze-frame data to see exactly when the fault occurred. Next, a Toyota-certified technician uses factory Techstream to view live parameters and perform isolation testing (smoke testing EVAP systems, checking fuel trims, verifying sensor signals, or running ignition tests as appropriate). Youll receive a written estimate before any repair is performed, so you can approve the plan with confidence. Warranty work generally requires a certified facility, which helps protect eligibility for applicable coverage after diagnosis and repair. Have questions or need a convenient time? Review current service specials and schedule your appointment online.

As 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—we provide OEM-level diagnostics tailored to Northern Utah driving. Factory scan tools go beyond generic code readers, unlocking Toyota-specific data for your 2015 Toyota Highlander. Local conditions matter: winter cold starts can surface misfire or battery-related codes, while temperature swings can expose EVAP leaks. Opened in 1979, our store continues to support Toyota drivers with accurate testing and clear repair plans. Visit us at 5650 South State Street, Murray, UT 84107, use our online scheduler, or check service specials before you arrive.

Many 2015 Toyota Highlander check engine lights trace to familiar OBD-II codes. P0442 indicates a small EVAP leak—often a loose gas cap or a cracked hose—which typically wont harm drivability but can fail emissions if ignored. P0300/P030x misfire codes risk overheating and damaging the catalytic converter when left unaddressed. P0420 flags low catalyst efficiency, which can follow long-term misfires. Air and fuel metering faults such as P0101 (MAF range/performance) or P0171 (system too lean) reduce power and fuel economy. Oxygen sensor codes like P0137/P0138 can skew mixture control. Addressing the root cause promptly prevents secondary failures and test-day headaches. Bring your 2015 Toyota Highlander to Larry H. Miller Toyota Murray in Murray for an accurate diagnosis — schedule service.