2020 Toyota 4runner Check Engine Light in Murray, UT

It means the 4Runner’s OBD-II system stored a fault code—common examples include P0440 (EVAP), P0420 (catalyst efficiency), or P0300 (misfire).

Your SUV’s computer detected a problem, logged a code, and illuminated the light to protect the engine and emissions system. In Murray’s changing temperatures, EVAP-related codes and cold-start misfires are common. Our technicians at Larry H. Miller Toyota Murray retrieve codes and live data to identify the exact fault—not just the system.

• Examples: P0440/P0455 EVAP leaks; P0420 catalytic converter; P0301–P0306 cylinder misfires
• A steady light signals a non-urgent issue; a flashing light indicates a severe misfire
• Schedule a diagnostic: schedule service

Typical causes include EVAP leaks (P0440/P0455), O2 sensor faults (P0136), MAF issues (P0101), catalytic converter efficiency (P0420), and misfires (P0301–P0306).

These faults range from minor (a loose gas cap) to drivability concerns that can damage the catalytic converter if ignored. The 4.0L V6 is robust, but accurate testing prevents unnecessary parts replacement. Our Murray team confirms root cause with Toyota scan data and targeted checks.

• Verify gas cap seal/tightness after EVAP codes
• Check fuel quality and ignition components for misfires
• Use live data to confirm O2/MAF sensor operation before replacement

If the light is steady, drive cautiously to a service facility; if it’s flashing, stop driving to avoid catalytic converter damage.

A flashing light usually indicates an active misfire that can overheat and damage the catalyst—repairs become far more expensive. A steady light often points to emissions or sensor issues but should still be checked soon. In the Salt Lake Valley, our team can quickly scan and advise next steps.

• Flashing = potential misfire; tow recommended
• Steady = schedule soon: schedule service
• Addressing issues early helps pass Utah emissions

Parts stores read basic codes, while our Toyota Techstream and factory procedures identify the exact cause with OEM data and pinpoint testing.

A single code can have multiple root causes—replacing parts based on a generic read often wastes money. We access proprietary data, run guided tests, verify fixes, and provide a written estimate before any repair. That level of diagnosis helps avoid comebacks and gets your 4Runner right the first time.

• Toyota Techstream access and OEM service information
• Isolation testing, smoke/pressure tests for EVAP, and live-data analysis
• Written estimate and repair roadmap for the 2020 Toyota 4Runner

No—clearing the light resets readiness monitors, and Utah inspections can fail a vehicle with “not ready” monitors.

Passing requires the 4Runner’s OBD-II monitors to complete drive cycles and report no active faults. Simply erasing codes may hide the underlying issue temporarily but will trigger a fail or a return of the light. We repair the cause, verify readiness, and help you pass legitimately.

• OBD readiness must show “complete” for key systems
• We confirm repairs and monitor status before you test
• Schedule an appointment: schedule service

Visit Larry H. Miller Toyota Murray at 5650 South State Street, Murray, UT 84107, or book online.

We serve Murray, Salt Lake City, Sandy, West Jordan, South Jordan, Millcreek, Holladay, and Taylorsville with factory-authorized diagnostics for the 2020 Toyota 4Runner. Use our online portal to choose a time that fits your day, and check current offers before you arrive.

• Online scheduling: schedule service
• View current offers: service specials
• Convenient Salt Lake Valley location with OEM-trained staff

Your 2020 Toyota 4Runner benefits from a structured diagnostic process designed to find the root cause before any parts are replaced. We begin with an initial OBD-II scan to capture fault codes and freeze-frame data, then review live parameters (fuel trims, O2 sensor activity, MAF readings, misfire counters) to form a test plan. Next, we perform isolation testing as needed—such as smoke testing the EVAP system, circuit and voltage checks, or ignition/fuel tests—to confirm the failure. You receive a written estimate with findings and repair options so you can decide next steps confidently. Ready to move forward? Book a convenient time online now: schedule service.

Larry H. Miller Toyota Murray serves the Salt Lake Valley and Greater Salt Lake City metro areaincluding Murray, Salt Lake City, Sandy, West Jordan, South Jordan, Millcreek, Holladay, and Taylorsvillewith factory-grade diagnostics for the 2020 Toyota 4Runner. Our team uses Toyota Techstream to access OEM data that generic code readers cant see, helping us distinguish between sensor faults and wiring, leaks, or mechanical issues. Local conditions matter: winter cold-starts can trigger misfire or air-fuel ratio codes, while seasonal temperature swings often expose EVAP leaks. If your light is on, schedule online and stop by our showroom and service center at 5650 South State Street, Murray, UT 84107. For questions or directions, use our contact page or schedule an appointment.

Owners of the 2020 Toyota 4Runner often see EVAP and sensor-related alerts. P0440/P0455 typically indicate an EVAP system leak, which may be as simple as a gas cap seal or as involved as a leak at a hose or canister; ignoring these can lead to repeated test failures and wasted fuel. P0420 signals reduced catalytic converter efficiency—continued misfires or rich conditions can ruin the catalyst, turning a small repair into an expensive replacement. P0101 (MAF range/performance) and P0136 (O2 sensor) affect fueling and drivability if left unchecked. Misfire codes P0301–P0306 can overheat the catalyst and should be addressed immediately. Bring your 2020 Toyota 4Runner to Larry H. Miller Toyota Murray in Murray for an accurate diagnosis — schedule service.