How much does oxygen (o2) sensor replacement cost?

Typically $150–$350 at a US independent shop — about $50–$175 in parts and $50–$175 in labor for a mainstream vehicle. Your exact cost depends on your year, make, model, and engine. The free AI Mechanic gives a vehicle-specific estimate.

What makes oxygen sensor replacement cheaper or more expensive?

Upstream vs downstream sensor; Access (some seize and need heat); OEM vs universal sensor.

Oxygen (O2) sensor replacement cost

A oxygen sensor replacement typically costs $150–$350 at a US independent shop for a mainstream vehicle — but your exact cost depends on your year, make, model, and engine.

Parts: $50–$175
Labor: $50–$175
Total: $150–$350

A lazy or dead O2 sensor triggers check-engine codes and hurts fuel economy — and is very often the real cause of a P0420 that looks like a catalytic-converter failure. Confirming this first can save you a $1,200 converter.

What affects the price

Upstream vs downstream sensor
Access (some seize and need heat)
OEM vs universal sensor

DIY vs. shop

Intermediate DIY if the sensor is accessible, saving $50–175.

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Ranges like this are a starting point. Tell the AI Mechanic your year, make, model, and the symptom or OBD2 code — it estimates the cost for your exact vehicle, flags the likely cheap fix before the expensive one, and tells you when a shop is genuinely the right call.

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Related codes: P0135 , P0141 , P0420 , P0171

Related symptoms: Failed emissions / smog test , Poor fuel economy

More repair costs

catalytic converter $900–$2,500 alternator $400–$900 brake pads $150–$350 brake rotors $300–$600 timing belt $500–$1,000 spark plugs $150–$400