How much does it cost to replace a O2 sensor on a Lexus?

In most Lexus models, a single O2 sensor replacement costs about $150–$500, depending on sensor type, the number of sensors required, aftermarket versus OEM parts, and local labor rates.

The following guide explains what drives those costs, what you can expect for different Lexus models, and how to plan your repair. It also covers DIY feasibility and ways to minimize expenses while protecting your vehicle’s emissions systems.

What factors influence the price

Prices vary based on sensor type (pre-cat versus post-cat), how many sensors your model uses, the choice of parts, and the shop’s labor rate.

• Sensor location and type: Upstream (pre-cat) and downstream (post-cat) sensors have different part prices, and some Lexus engines use more than one sensor per bank. Parts for upstream sensors tend to be lower on aftermarket options but can be pricier when OEM parts are involved.


• Number of sensors: Some Lexus models require replacing one sensor, while others may require two or more sensors (e.g., bank 1 sensor 1 and bank 2 sensor 1, plus possible downstream sensors).


• Parts choice: Aftermarket sensors are typically cheaper than OEM (Toyota/Lexus-branded) parts, but OEM parts are often recommended for fit and long-term reliability, especially on newer models.


• Labor rate and time: Labor charges depend on geography and shop type (dealership vs independent). Typical time to replace a single sensor is around 0.5–1 hour, with longer times if multiple sensors are involved or access is difficult.


• Diagnostics and additional work: Some shops charge a diagnostic or inspection fee, which may be waived if you proceed with the repair. If wiring or exhaust components are corroded, extra labor or parts may be needed.


• Vehicle model and year: Some Lexus engines have more compact or hard-to-reach sensors, which can raise labor time and cost.

Bottom line: The overall bill will reflect which sensor(s) are involved, the part quality you choose, and the going labor rates in your area. Expect a wide but typical range as outlined above.

Parts cost breakdown

Understanding the cost of the sensor itself helps separate parts from labor. Here are approximate ranges you might see for common Lexus O2 sensors.

• Upstream (pre-cat) sensor: aftermarket roughly $20–$120; OEM roughly $60–$250.


• Downstream (post-cat) sensor: aftermarket roughly $35–$150; OEM roughly $100–$350.


• Gaskets or wiring harness adapters (if needed): $5–$25.

In practice, most single-sensor replacements fall in the overall range discussed earlier, with OEM parts driving the higher end of the price and aftermarket parts offering a more budget-friendly option. The diagnostic portion of the bill, if charged separately, can add to the total but is sometimes included when the repair proceeds.

Labor costs and time

Labor contributes a substantial share of the total cost, and times can vary by model and shop.

• Typical time: 0.5–1 hour for a straightforward replacement of one sensor; 1–2 hours if two sensors are involved or access is challenging.


• Labor rate range: commonly $75–$150 per hour in many U.S. markets; higher in urban or dealership settings, potentially $200+ per hour in some areas.


• Diagnostic and additional work: Some shops include a basic diagnostic in the labor, while others itemize it separately. Wiring harness inspection or replacement, if required, adds time and cost.

These figures reflect typical U.S. market ranges as of 2024–2025. Local pricing can vary significantly, so it’s wise to obtain multiple quotes from independent shops and a dealership for comparison.

By model/year: what to expect for Lexus

Lexus models vary in engine layout and sensor counts. Here is a practical snapshot of what you might expect for common models, using ranges that reflect parts and labor combined.

• Lexus IS/ES/NX RX lineups (single-sensor replacements): parts may range from about $60–$250 (OEM) or $20–$120 (aftermarket) for upstream sensors, with downstream sensors often $100–$350 OEM or $40–$180 aftermarket. Total per sensor commonly $150–$500, depending on parts and labor.


• Lexus LS and other V8 configurations or models with more sensors: costs can be higher due to additional sensors and tighter spaces, with total per sensor often in the $200–$600 range when OEM parts are used and labor rates are at the upper end.

Note: These ranges are intended as guidance. Your exact quote will depend on the exact sensor location, the number of sensors affected, OEM versus aftermarket parts, and local labor rates. Always request a parts-and-labor breakdown to compare accurately.

DIY viability

Replacing an O2 sensor is a common DIY task for many car enthusiasts, but there are cautions to consider.

• Accessibility matters: Some Lexus models place sensors in tight or hot areas near the exhaust, which can require special tools or careful handling.


• Safety and emissions: If you’re not comfortable with working near the exhaust system or dealing with stubborn fasteners, professional service is safer and often ends up costing less in time and frustration.


• Warranty and codes: If your check engine light is on due to an O2 sensor fault, clearing codes should be done after the replacement to confirm the fix. Some shops charge diagnostic fees regardless of DIY decisions.

If you do DIY, ensure you have the correct replacement sensor (OEM vs aftermarket) for your exact Lexus model and year, and follow the service manual guidance for torque specs and sensor handling to avoid damaging the new part.

When to replace and warning signs

Typical indicators that an O2 sensor may need replacement include persistent check engine light, high or fluctuating fuel trims, poor fuel economy, rough running or misfires, and lean or rich condition codes. If you notice any of these, have the O2 sensors tested, and consider replacing the faulty unit rather than chasing downstream problems that can stem from a bad sensor.

Summary

Replacing an O2 sensor on a Lexus generally costs between $150 and $500 for a single sensor, with higher figures if you opt for OEM parts, have multiple sensors replaced, or operate in areas with steep labor rates. Parts costs vary by sensor type and whether you choose OEM or aftermarket parts, with upstream sensors typically cheaper than downstream sensors. Labor time is usually 0.5–2 hours depending on sensor count and accessibility, with rates commonly ranging from $75 to $150 per hour in many markets. To minimize surprises, obtain a detailed quote that breaks out parts and labor, and consider dealership quotes for comparison with independent shops. Always confirm the exact sensor placement and model requirements before purchasing parts. Summary: plan for a total that reflects sensor count, part choice, and regional labor costs, then verify with multiple shops for the best value.

Can I drive a car with a bad O2 sensor?

Yes, you can drive a car with a bad oxygen sensor, but it is not recommended because it will negatively impact your vehicle's performance, fuel economy, and emissions, and could lead to more costly repairs like a damaged catalytic converter. The engine will likely run on a default setting, but you may notice poor gas mileage and could fail an emissions test.
 
This video explains what happens if you drive with a bad O2 sensor: 40sExoni ViewsYouTube · Jul 14, 2025
Risks of driving with a bad O2 sensor

• Reduced fuel efficiency: The sensor provides incorrect data, causing the engine to either use too much fuel (run rich) or not enough (run lean). 
• Increased emissions: Without accurate data, the engine can't properly tune the air-fuel mixture, leading to higher pollution and a potential failure on an emissions test. 
• Damage to the catalytic converter: If the engine runs rich for too long, unburnt fuel can overheat and clog the catalytic converter, which is an expensive part to replace. 
• Other engine issues: A bad O2 sensor can lead to other problems, such as misfires or damage to spark plugs over time. 
• Performance issues: While the car may still be drivable, you could notice a drop in performance. 

What to do

• Get the sensor replaced as soon as possible to avoid long-term damage and costly repairs. 
• If you are stranded, drive carefully, try to maintain a steady speed, and minimize unnecessary driving to prevent further damage to the catalytic converter. 

How much does it cost to replace the oxygen sensor on a Lexus RX350?

The average cost for a Lexus RX350 Oxygen Sensor Replacement is between $546 and $664. Labor costs are estimated between $154 and $226 while parts are priced between $391 and $438. This range does not include taxes and fees, and does not factor in your unique location.

Is it worth fixing an O2 sensor?

A: Yes, replacing a faulty oxygen sensor can improve fuel efficiency by ensuring proper air-fuel mixture and combustion.

Is replacing an O2 sensor expensive?

No, replacing an O2 sensor isn't excessively expensive, with a typical professional replacement costing between \$150 and \$600, including parts and labor. However, costs can be higher for premium vehicles or when sensors are hard to access, potentially reaching \$600–\$800. DIY replacement is often cheaper, with part costs ranging from approximately \$20 to \$300 per sensor. 
This video explains the cost of replacing an oxygen sensor: 1mLearnToDIY360YouTube · Jun 19, 2025
Factors that influence cost

• Labor: Professional installation adds to the cost. A single sensor can take a technician about 30 minutes to replace under normal circumstances. 
• Sensor location: The sensor's position affects the price. Upstream sensors (before the catalytic converter) can be more difficult and expensive to replace than downstream sensors. 
• Vehicle make and model: The make, model, and age of your car can impact the price, especially for luxury or import vehicles that may have more expensive parts or require more complex labor. 
• Corrosion: If the old sensor is rusted or seized, it can significantly increase labor time and cost. 
• Parts: The price of the sensor itself varies. OEM (Original Equipment Manufacturer) parts are generally more expensive than aftermarket alternatives. 

Cost-saving tips

• DIY: If you are comfortable with car repairs, replacing the sensor yourself can be significantly cheaper. You may need a special O2 sensor tool to make the job easier. 
• Shop around: Compare prices at different shops to find the most competitive rate for your area. 
• Check warranty: See if your vehicle warranty covers the repair. 

You can watch this video to learn why replacing an oxygen sensor can sometimes be more expensive than you think: 1mEC Auto RepairYouTube · Apr 23, 2024