Frequently Asked Questions

What is the most common reason for check engine light on a 2025 Toyota Tacoma?

• Loose or damaged gas cap causing an EVAP leak is the single most frequent cause.
• Faulty oxygen sensors or mass air flow sensors that affect fuel trim and emissions.
• Ignition misfires from coils or spark plugs that trigger codes and can damage the catalytic converter.
• Early diagnosis at Nalley Toyota of Roswell prevents small faults from becoming costly repairs and saves on fuel and emissions fines.

What does it mean when the check engine light comes on in a 2025 Toyota Tacoma?

• It signals that an onboard sensor detected an emissions or engine performance issue; symptoms range from a loose gas cap to misfires.
• Some issues are minor and driveable, while others indicate immediate attention is needed to avoid damage.
• Our factory-trained technicians use Toyota diagnostics to identify the exact fault and recommend repairs that protect warranty coverage.
• Bringing the vehicle to a certified dealership often yields immediate and long-term savings versus delayed or incomplete repairs.

What is the first thing to check when the check engine light comes on?

• Confirm the gas cap is tightened and undamaged—an easy fix that clears many codes.
• Note any new noises, loss of power, or additional warning lights to share with the technician.
• Do not repeatedly reset the light; proper diagnostics preserve repair history and warranty eligibility.
• If the light flashes or vehicle runs poorly, stop driving and have Nalley Toyota of Roswell evaluate it immediately to avoid further damage.

How much does a check engine light diagnostic cost for a 2025 Toyota Tacoma?

• Diagnostic fees vary; our dealership provides transparent pricing and often lower overall costs than independent shops due to accurate diagnosis and lasting repairs.
• Accurate diagnostics prevent repeated, unnecessary repairs—saving you money long term and preserving fuel economy.
• If a repair is covered under warranty, it must be performed at a certified dealership to retain coverage and ensure factory parts are used.
• Ask about service specials and our upfront estimates so you can compare immediate and lifetime savings before authorizing work.

How long does a check engine light service take?

• Simple checks (gas cap, code read) can take 15–30 minutes; most diagnostics are completed within an hour.
• Repairs depend on the issue—sensor swaps are often same-day; more complex engine or exhaust repairs may take longer.
• Nalley Toyota of Roswell prioritizes efficient service with factory-trained technicians and genuine parts to minimize downtime.
• We provide clear time estimates and explain immediate versus long-term benefits, helping you choose the most cost-effective option.