O2 Sensors
A properly functioning oxygen or O2 sensor monitors the oxygen fuel mixture in your car's exhaust system. The perfect mixture provides excellent efficiency and gas mileage. Read More About O2 Sensors»

Avoid high-cost engine repairs down the road by inspecting your car or truck's exhaust system regularly. But, if you hear a rattle or vibration when your car is running, it may be time to replace your fuel filter, O2 sensor or muffler. Come by Merle's Automotive Supply today at 4015 South Dodge Blvd in Tucson or call us at 520-889-7202 to get the right auto parts for your fuel and exhaust system.

Catalytic Converter Replacement

Your catalytic converter is the most expensive part of your exhaust system. When your catalytic converter begins to fail, you will hear a very loud rattling noise or your "check engine light" will begin to flash. Come by Merle's Automotive Supply at 4015 South Dodge Blvd and we will diagnose the problem right away.

O2 Sensor Replacement

Ask any of our auto parts specialists at Merle's Automotive Supply and they will tell you to have your O2 sensor inspected regularly. Oxygen sensors work in conjunction with your catalytic converter to monitor the amount of oxygen in your car's exhaust system. Your O2 sensor determines if your air to fuel ratio is balanced in real-time as you accelerate or idle. It helps your engine controller adjust the flow of fuel to maintain optimum oxygen to fuel mixture.

Muffler Replacements

At Merle's Automotive Supply we know that when your engine runs and pushes exhaust through the exhaust pipe it is unbearably loud. Your muffler dampens or shapes the sound produced by your engine and exhaust pipe. Different types of mufflers produce different sounds ranging from extremely quiet to an ear-splitting roar. So whether you are looking to make your vehicle as quiet as possible, or one that announces your arrival, at Merle's Automotive Supply, we have a performance muffler for you.