O2 sensor replacement runs $150-$500 per sensor. Modern wideband AFR sensors and bank 2 / downstream sensors with poor access cost more.
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DIY saves $50-$150 if the sensor isn't seized; use the correct O2 socket.
Typical total runs $79–$544 in Mississippi, with parts around $50–$400 and labor $29–$144 at the MS average labor rate of $96/hr.
New OEM-spec O2 sensor; Anti-seize on threads; Code clearing; Drive cycle verification.
Upstream vs downstream Narrowband vs wideband (AFR) Accessibility (some require subframe drop) Always get more than one written quote.
DIY saves $50-$150 if the sensor isn't seized; use the correct O2 socket.
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