2023 Toyota GR Supra Check Engine Light

The check engine light indicates the OBD-II system detected a fault in a monitored component or system and stored a diagnostic trouble code (DTC).

On a 2023 Toyota GR Supra, a steady light typically flags an emissions or drivability issue, while a flashing light signals a severe misfire. Our Murray, UT team retrieves the DTC and freeze-frame data to identify what happened and under which conditions. From loose gas caps to sensor faults, we translate the code into a root cause and a clear plan.

• OBD-II DTC pinpoints the affected system (e.g., EVAP, O2, misfire)
• Freeze-frame shows RPM, load, and temperature when the fault set
• Toyota Techstream access enables deeper, model-specific data

Common causes include EVAP leaks (loose gas cap), O2 sensor faults, MAF issues, catalytic converter efficiency codes, and cylinder misfires.

Turbocharged, direct-injected engines like the 2023 Toyota GR Supra can log codes when air/fuel measurements drift or when small vacuum leaks occur. In the Salt Lake Valley, temperature swings can aggravate EVAP seal issues. Our technicians in Murray verify the code, then test the exact component rather than guessing.

• Small EVAP leak (P0442/P0456) often traced to cap or hoses
• O2 or A/F sensor aging affects fuel trim and emissions
• Misfire (P0300–P0304) risks catalytic converter damage if ignored

Yes if the light is steady and the car drives normally; no if it’s flashing—stop driving to avoid catalytic converter damage.

A steady light on a 2023 Toyota GR Supra usually indicates an emissions-related fault that can be driven cautiously to our Murray service center. A flashing light signals an active misfire, which can overheat and melt the catalytic converter. When in doubt, reduce load and schedule a prompt inspection.

• Steady light: drive gently and schedule service
• Flashing light: safely pull over and arrange a tow
• Prolonged driving with a misfire can multiply repair costs

Parts stores read basic codes; our dealership performs full diagnostics with Toyota Techstream, guided tests, and a written estimate.

Code readers only tell you what system set a fault, not which part failed or why. In Murray, our Toyota-certified team accesses live data, bidirectional tests, and model-specific bulletins for the 2023 Toyota GR Supra. You get root-cause confirmation before any repair and documentation for your records.

• Factory scan tool access beyond generic OBD-II
• Isolation testing to avoid unnecessary parts
• Clear findings and repair options in writing

No—resetting clears readiness monitors, and most Utah emissions tests fail vehicles with incomplete monitors or returning faults.

After a reset, the 2023 Toyota GR Supra must complete a drive cycle so monitors set to “ready.” If the underlying issue remains, the light will come back and the test will fail. We fix the cause, confirm monitors are complete, and help you avoid retests in the Salt Lake City area.

• Readiness monitors must be “complete” to pass
• Root-cause repair prevents the code from returning
• We verify monitors before you head to inspection

Yes—a loose or worn cap can trigger EVAP leak codes like P0442 or P0456 on a 2023 Toyota GR Supra.

In the Salt Lake Valley, temperature changes can shrink seals and expose minor leaks that set an EVAP code. Try tightening the cap until it clicks; if the light stays on after several trips, visit Larry H. Miller Toyota Murray for a smoke test to confirm leaks. We’ll separate cap issues from hose or purge valve faults.

• Click the cap 3+ times after fueling
• Inspect the cap seal for cracks or flattening
• Schedule an EVAP smoke test if the light persists

Your visit begins with a verified concern check, then a Toyota-compatible OBD-II scan to retrieve stored and pending DTCs on your 2023 Toyota GR Supra. Our technicians review freeze-frame data and live sensor values to understand the exact conditions when the code set. Next, we perform isolation testing—such as smoke testing EVAP systems, testing O2/A/F sensor signals, checking MAF/boost leaks, or cylinder-specific misfire diagnostics—to identify the root cause. You receive a written estimate before any repair, outlining parts, labor, and next steps. If multiple faults appear, we’ll prioritize safety and emission-critical items first. Ready to proceed? Use our online scheduler to choose a time that fits your day.

Schedule service | Service specials

Larry H. Miller Toyota Murray serves drivers across Murray, Salt Lake City, Sandy, West Jordan, South Jordan, Millcreek, Holladay, and Taylorsville with factory-authorized diagnostics for the 2023 Toyota GR Supra. Our team uses Toyota Techstream to access enhanced data and perform bidirectional tests that generic readers can’t. Northern Utah’s temperature swings can reveal EVAP leaks, and cold starts may surface fuel-trim or misfire codes—our process distinguishes temporary conditions from true faults. You’ll leave with clear findings and an estimate you can approve online or in-store.

We’re conveniently located at 5650 South State Street, Murray, UT 84107. Have a steady or flashing light? Book now, and we’ll guide you on next steps and safe driving recommendations: schedule an appointment.

While codes vary by vehicle history, 2023 Toyota GR Supra owners often encounter patterns seen in modern turbocharged engines. P0300–P0304 indicates random or cylinder-specific misfires; ignoring these can overheat the catalytic converter and escalate costs quickly. P0420 flags catalyst efficiency below threshold, sometimes caused by prolonged misfires or sensor faults. P0171 (system too lean) and P0101 (MAF range/performance) suggest unmetered air or sensor drift. P0442/P0456 signal small EVAP leaks, frequently traced to a loose fuel cap or brittle hoses. P0138/P0158 suggest downstream O2 sensor issues.

Addressing codes promptly preserves performance and emissions components that are expensive to replace. Bring your 2023 Toyota GR Supra to Larry H. Miller Toyota Murray in Murray for an accurate diagnosis — schedule service.