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WHEN TO REPLACE YOUR OXYGEN SENSORCarbon, soot, harmful gases, anti-freeze, chemicals and thermal and physical shock shorten the life of an oxygen sensor. That's why checking for, and possibly replacing*, a worn-out oxygen sensor is an important part of every routine tune up. *Most oxygen sensors wear out after 30,000 to 50,000 miles in use. Newer heated-type oxygen sensors with 3 or 4 wires wear out after 60,000 to 100,000 miles.
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