High-quality oxygen sensors (O2 sensors) for all makes and models. Direct-fit replacements restore fuel economy, reduce emissions, and eliminate check engine lights.
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Frequently Asked Questions
What are symptoms of a bad oxygen sensor?
Check engine light, poor fuel economy, rough idle, failed emissions test, and sluggish acceleration are common symptoms. You may also notice black smoke from exhaust or sulfur smell. Modern vehicles have 2-4 O2 sensors that should be diagnosed with a code reader.
Can I drive with a bad O2 sensor?
Yes, but it's not recommended long-term. A faulty O2 sensor causes poor fuel economy (up to 40% decrease), potential catalytic converter damage from running too rich, and increased emissions. Address O2 sensor issues promptly to avoid more expensive repairs.
How often should oxygen sensors be replaced?
Replace heated O2 sensors every 60,000-90,000 miles as preventive maintenance. Unheated sensors (older vehicles) should be replaced every 30,000-50,000 miles. Even if not failed, aging sensors become less accurate, affecting fuel economy and performance.
What's the difference between upstream and downstream O2 sensors?
Upstream (Bank 1/2 Sensor 1) monitors air-fuel mixture before the catalytic converter for engine management. Downstream sensors (Sensor 2) monitor converter efficiency. Upstream sensors affect engine performance and fuel economy; downstream primarily monitors emissions system function.
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