Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2026 Mercedes-Benz CLE?

• Typical diagnostic fees range from about $99 to $199 depending on the depth of testing and any road testing required.
• Our dealership often costs less than independent shops over time by combining accurate diagnostics, genuine parts, and repairs done right the first time—reducing repeat visits and unexpected expenses.
• Immediate savings come from precise fault identification; long-term savings come from preserving fuel economy and preventing catalytic or engine damage.
• Repairs covered under warranty must be performed at a certified dealership to remain eligible—our factory-trained technicians and official parts protect your warranty benefits.

What does it mean when the check engine light comes on in a 2026 Mercedes-Benz CLE?

• The light signals the vehicle’s onboard diagnostics detected a fault in emissions, ignition, fueling, or emissions-control systems.
• Common causes include a loose fuel cap, oxygen sensor issues, catalytic converter efficiency, misfires, or EVAP leaks—each requires a targeted diagnostic to confirm.
• An illuminated light may indicate a minor issue or a condition that will degrade performance and fuel economy if left unaddressed.
• Bring your CLE to our service center for an exact code read and a recommended repair plan performed by Mercedes-Benz-certified technicians.

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

• Start with simple checks: ensure the gas cap is tightened firmly—an EVAP leak from a loose cap is a common trigger.
• Check for obvious signs: unusual exhaust smoke, loss of power, or abnormal noises may indicate a more urgent issue.
• If symptoms are limited to the light, schedule a diagnostic; clearing codes without repair can hide progressive damage.
• For warranty protection and accurate repairs, have any necessary work performed at our certified Mercedes‑Benz service center.

How long does a check engine light service take?

• Simple diagnostics and code reads often take 30–60 minutes; many repairs like sensor replacement can be completed the same day.
• Complex issues requiring parts or deeper engine work can take several hours to a few days depending on parts availability and the scope of repair.
• We expedite service with factory tools, streamlined parts access, loaner and courtesy vehicle options, and clear timelines so you know what to expect.
• Warranty-covered repairs must be completed at a certified dealership to retain coverage—this ensures proper calibration and long-term reliability.

What is the most common reason for check engine light on a 2026 Mercedes-Benz CLE?

• Many modern vehicles show the light most often for EVAP system leaks (including a loose fuel cap) or oxygen sensor faults affecting emissions and fuel trim.
• Other frequent causes include misfires from ignition coils or spark plugs and issues with catalytic converter efficiency.
• If left untreated, small issues can escalate into costly repairs; addressing codes early preserves fuel efficiency and avoids catalytic damage.
• Our certified technicians diagnose root causes with factory-grade equipment and perform repairs that protect warranty coverage and long-term value.