Warranty

Warranty Information

Air/Fuel or Oxygen sensor Warranty

All sensors carry a 12 month - 24,000 mile warranty. Whichever occurs first. All sensors we provide are “OEM”(Original equipment manufacturer), Or “OE” equivalent. Warranty will be voided if any altercations and/or damage occurred to sensor.

Catalytic Converter Warranty

Marco Muffler carries a 5 year, 50,000 mile manufacture warranty on aftermarket catalytic converters. OEM(Original Equipment) catalytic converters carry a 1 year, 12,000 mile warranty. In the event check engine light comes on for a P0420, P0430, or a failed smog, in order to process a warranty for any catalytic converter the manufacturer requires Marco Muffler to submit a fuel trim/vehicle performance diagnostic. Which relates to emissions performance. This diagnostic must be done by a certified automotive business, and all paper work is required to be submitted. All paper work includes, original invoice, a copy of the diagnostic performed by the certified automotive business. If the vehicle failed smog we would need a copy of the failed smog report.

**The Catalytic converter warranty will be voided if the converter appears discolored (Overheated), or any sign of internal melt down. In addition, any misfire, oxygen sensor issue, exhaust leak, major performance issues, fuel or coolant contamination will void warranty.**

Custom Work Or Repair Warranty

Marco Muffler carries a 2 year unlimited mileage warranty on all labor, and parts that are installed. Warranty voids if work has been altered or if any damage has occurred to labor or parts.

Please print and fill out the attached flyer, or you can come into the shop to have our team walk you through the process.