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It’s the OBD-II Malfunction Indicator Lamp (MIL) signaling a detected fault in your engine or emissions system.

Your 2021 Honda Clarity stores a diagnostic trouble code (DTC) that identifies the affected system or sensor. A steady light usually indicates a non-urgent issue; a flashing light signals a misfire that can damage the catalytic converter. Our Seekonk team retrieves codes and freeze-frame data to determine the underlying cause and next steps.

• OBD-II code read with Honda-capable scan tools
• Freeze-frame data review to see what conditions triggered the fault
• Schedule service for a professional diagnosis in Seekonk

Typical causes include O2 sensor faults, EVAP small leaks (P0442/P0456), mass air flow issues, misfires (P0300–P0304), and catalytic converter efficiency (P0420).

These issues are common on modern gasoline engines, including the 2021 Honda Clarity’s powertrain. Some are minor—like a loose gas cap—while others can affect drivability and emissions. Our diagnostic process separates the code from the cause so you address the right repair the first time.

• Visual checks for loose caps, damaged hoses, or intake leaks
• Targeted tests (EVAP smoke test, sensor circuit checks) as needed
• See current service specials before you book

A steady light means you can drive cautiously to service, but a flashing light indicates a severe misfire—stop driving and arrange a tow.

Driving with a flashing MIL can overheat and damage the catalytic converter, leading to expensive repairs. If the light is steady and the car runs normally, avoid hard acceleration and schedule diagnosis soon. In Seekonk, our team can inspect your 2021 Honda Clarity promptly and provide a clear plan.

• Flashing MIL = misfire risk to catalytic converter
• Steady MIL = reduced performance or emissions concern
• Schedule an appointment for timely evaluation

Parts stores read the code; dealer technicians perform full diagnostics using Honda’s factory tools and service data to find the actual cause.

A single code can have multiple root causes. Our Seekonk team uses Honda-specific software, guided tests, and service bulletins to validate the fault before any repair. You receive findings and a written estimate so you can decide with confidence.

• Honda-capable scan tools and proprietary data access
• Isolation testing to confirm the failed part or system
• Written estimate before any repair is authorized

No—clearing codes resets OBD-II readiness monitors, which can cause an automatic emissions test failure in MA and RI until monitors complete.

Inspection programs verify that required readiness monitors are “complete.” After clearing, your 2021 Honda Clarity must be driven through specific conditions before monitors reset. We can advise on drive cycles and fix the root issue so the light stays off for inspection.

• Readiness status checked during OBD-II inspections
• Drive cycles needed after clearing codes or repairs
• Schedule service to correct the cause, not just the symptom

Herb Chambers Honda of Seekonk on Route 44 in Seekonk, MA performs OBD-II diagnostics for the 2021 Honda Clarity with Honda HDS equipment.

We serve drivers from Providence, East Providence, Pawtucket, Attleboro, and beyond. Our factory-trained technicians evaluate codes, freeze-frame data, and system performance to deliver an accurate repair plan. Book online for a convenient time.

• Easy access from Providence and Northern Rhode Island
• Honda-focused diagnostic process for clarity and accuracy
• Schedule now or check service specials

When your 2021 Honda Clarity turns on the check engine light, our Seekonk team combines OBD-II data with Honda-specific testing to pinpoint the fault. We serve Seekonk, East Providence, Providence, Pawtucket, Attleboro, Rehoboth, Swansea, Barrington, Warren, and Bristol. Generic code readers identify a code; our process verifies the source, whether that’s an EVAP leak, sensor drift, fuel-trim imbalance, or a misfire that threatens the catalytic converter. You’ll get clear findings and a written estimate before any repair. For quick access, we’re on Route 44 in Seekonk with online scheduling and same-day availability on many diagnostics.

Have a steady light and normal drivability? Drive gently and book soon. See a flashing light or feel rough running? Minimize use and schedule a tow to protect the converter. For directions or to choose a time that works for you, use our schedule service tool and review current service specials.

Our diagnostic workflow is designed to separate the code from the cause. First, we connect a Honda-capable scan tool to retrieve DTCs and freeze-frame data. Next, we review live data and perform visual checks for common faults like loose gas caps, vacuum leaks, or damaged wiring. If needed, we run isolation tests—such as EVAP smoke testing, sensor circuit verification, or misfire analysis—to validate findings.

You’ll receive a written estimate before any repair is authorized, along with recommendations prioritized by safety, emissions impact, and cost. After repairs, we clear codes, confirm readiness monitor status, and road test to verify the light stays off. Ready to move forward? Use our convenient schedule service tool, and don’t forget to check service specials for added value.

While any fault can illuminate the light, several codes appear frequently on modern Honda engines. P0442/P0456 often indicate small EVAP leaks—from loose caps to minor hose leaks—that can increase evaporative emissions; ignoring them can eventually harm the charcoal canister. P0420 points to reduced catalytic converter efficiency; driving with ongoing misfires or rich mixtures can accelerate converter damage and increase repair costs. P0300–P0304 flag random or cylinder-specific misfires that can overheat the converter if left unresolved. P013x-series codes relate to oxygen sensor performance and can affect fuel economy and emissions.

Seeing any of these on your 2021 Honda Clarity? Addressing root causes early protects the converter and helps ensure inspection readiness. Bring your 2021 Honda Clarity to Herb Chambers Honda of Seekonk in Seekonk for an accurate diagnosis — schedule service.