O2 Sensor Replacement Cost 2026: Part Prices + Labor Calculator
Updated November 2026
Quick Answer
The sensor itself: RockAuto listed oxygen sensors for the five vehicles below at $25.79 to $193.79 per sensor on 9 November 2026, depending on the car, the position and the brand. That is the whole bill if you fit it yourself. At a shop, add labor: the hours it quotes for your car times its hourly rate. Work out your total.
| Vehicle | Upstream | Downstream |
|---|---|---|
| 2018 Honda Civic 2.0L | $75.79 - $150.796 listings | $32.79 - $193.794 listings |
| 2018 Toyota Camry 2.5L | $89.79 - $181.795 listings | $127.791 listing |
| 2018 Ford F-150 5.0L V8 | $40.79 - $123.8914 listings | $25.79 - $48.796 listings |
| 2018 Chevrolet Silverado 1500 5.3L V8 | $28.99 - $71.798 listings | $28.79 - $38.795 listings |
| 2018 BMW 330i 2.0L turbo | $79.79 - $130.896 listings | $28.79 - $111.796 listings |
Part only, before shipping and tax. Lowest to highest RockAuto listing for each position across every brand shown (Bosch, Denso, NTK, Walker Products, Ultra-Power and others), read on 9 November 2026. Vehicle names link to the listings. The F-150 and Silverado V8s have two exhaust banks, so two upstream and two downstream sensors. How many sensors does your car have?
What Determines Your Price
Sensor Position
Upstream sensors control fueling; downstream sensors monitor the catalytic converter. On some cars, such as the Camry above, the upstream part is an air/fuel ratio sensor.
Upstream vs downstream guideVehicle and Engine
The same model can use different sensors on different engines, so price the exact engine your car has.
Cost by vehicleShop Rate and Hours
Labor is the hours the shop books for your car times its hourly rate. Both vary by shop, so ask for both before you agree to the job.
Dealer vs shopBrand of Part
RockAuto lists several brands for each position, from economy lines to makers that supply carmakers, such as Denso, Bosch and NTK.
OEM vs aftermarket guideWhen to Fix Now vs Later
The answer depends on which sensor has failed.
Upstream Sensor: Fix Soon
- Feeds the engine computer its air/fuel mixture reading
- A bad reading can cost fuel economy and cause rough running
- Running rich for long periods can damage the catalytic converter
- Turns on the check engine light, which fails an OBD-II inspection
Downstream Sensor: Can Wait
- Monitors the catalytic converter; does not set the fuel mixture
- The car drives the same
- Check engine light stays on, which can hide a new fault
- Fix before your next emissions inspection
Not sure which sensor failed? Look up your OBD code or read the symptoms guide.
The P0420 Misdiagnosis Trap
P0420 means "catalyst system efficiency below threshold" (bank 1). It is set from the downstream sensor's readings, so it is easy to blame the sensor, but the sensor is usually the messenger, not the problem. A new downstream sensor rarely clears a P0420.
Before authorizing a sensor replacement on P0420, ask the mechanic to show you live sensor data. If the upstream sensor switches normally and the downstream reading mirrors it, the catalytic converter is the likely issue. Full P0420 diagnostic guide
O2 Sensor Replacement Cost Calculator
Part price from RockAuto listings for your vehicle, plus labor at the hours and hourly rate your shop quotes you. Every input is visible, so you can redo the sum.
6 upstream listings on RockAuto for this engine: Ultra-Power 2345710 at $75.79 to Denso 2345710 at $150.79.
Example value. Ask the shop for the book time on your car.
Most shops post it at the counter or will tell you on the phone.
Part only (DIY)
$75.79 - $150.79
RockAuto listings, before shipping and tax
Shop job (part + labor)
Enter a rate
Labor = hours x rate
Part prices read from RockAuto on 9 November 2026. Check today's listings for the 2018 Honda Civic 2.0L.
Explore the Full Guide
Everything you need to make an informed decision about O2 sensor replacement.
Cost by Vehicle
Prices for 15 popular models: Camry, F-150, Civic, Silverado, and more
Upstream vs Downstream
What each sensor does, what each costs, and which to fix first
OBD-II Code Reference
Every O2 sensor code explained, plus the P0420 misdiagnosis trap
Symptoms of Failure
8 signs your O2 sensor is bad and which ones actually matter
DIY Replacement Guide
Step-by-step instructions including the seized thread problem
Dealer vs Shop Prices
Compare dealer, independent, and chain shop pricing
7 Ways to Save
Ways to bring the repair bill down
Worth Replacing?
When to fix, when to wait, and when to sell the car
How Many Sensors?
Sensor count by engine type and 20 popular vehicles
Labor Time Guide
What shops charge vs what the job actually takes
OEM vs Aftermarket
Brand comparison: when cheap is fine and when it costs you more
Related Auto Repair Costs
Researching other repairs? These guides use the same format.
Spark Plug Change Cost
While you are under the hood, spark plugs may be due
Fuel Injector Replacement Cost
Similar symptoms: rough idle, poor fuel economy
Fuel Pump Replacement Cost
Fuel delivery system repair costs and timing
Alternator Replacement Cost
Common mid-mileage repair for all vehicles
Brake Pad Replacement Cost
Routine safety maintenance pricing
Brake Disc Replacement Cost
UK directional sister site, brake-cluster reference
Frequently Asked Questions
How much does it cost to replace an O2 sensor?
The part: RockAuto listed oxygen sensors for five common vehicles (2018 Civic, Camry, F-150, Silverado 1500 and BMW 330i) at $25.79 to $193.79 each on 9 November 2026, depending on the car, the position and the brand. At a shop, add labor: the hours the shop quotes for your car multiplied by its hourly rate. The calculator on this page does that sum with your shop's numbers.
How long can you drive with a bad O2 sensor?
A failed downstream sensor does not change how the engine is fuelled; it reports on the catalytic converter, so the car drives the same. A failed upstream sensor feeds the engine computer bad mixture data, which can cost fuel economy, cause rough running and, left long enough, harm the catalytic converter. Fix an upstream fault soon; a downstream fault can wait until you need to pass an inspection.
Can I replace just one O2 sensor?
Yes. Replace the sensor the fault code points to. There is no requirement to replace sensors in pairs or all at once.
Is P0420 an O2 sensor code?
No. P0420 means catalyst system efficiency below threshold (bank 1). The downstream sensor reports the problem but is usually not the cause, so replacing it rarely clears the code. Ask for live sensor data before paying for a sensor on a P0420.
Will a bad O2 sensor cause a car to fail emissions?
In states that test 1996 and newer cars by plugging into the OBD-II port, a lit check engine light is a failure, whichever sensor set it. A failed upstream sensor can also raise real tailpipe emissions.