PickSmartly Review

Best Ac Delco Oxygen Sensors in 2026

9.7 PM Score
Products Evaluated
11
Reviews Analyzed
2,708
Brands Ranked
4
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When your check engine light illuminates with a P0130 or P0171 code, the culprit is frequently a compromised oxygen sensor. As a critical component of your vehicle's closed-loop fuel system, these sensors monitor exhaust gases to ensure the engine maintains the ideal air-fuel ratio. Choosing AC Delco oxygen sensors is a strategic decision for many drivers, particularly those operating GM-engineered vehicles, because these sensors are designed to meet the exact electrochemical specifications required by the Engine Control Module (ECM). Selecting the right sensor isn't just about finding a part that fits. It is about ensuring the voltage response time and thermal stability match the factory calibration to prevent recurring driveability issues.

Editor's Choice

Our Top Picks for Ac Delco Oxygen Sensors

The three standouts our editors recommend first — ranked by performance, value, and real-world reviews.

#1

GM Genuine Parts AFS123 Heated Oxygen Sensor

GM Genuine Parts Heated Oxygen Sensor

4.7 (248 ratings)
GENERAL MOTORS AFS123 7.60 X 2.00 X 2.30 Inches 0.26 Pounds

Reviews for GENERAL MOTORS (PM Score)

9.7 PM Score
Buy on Amazon
  • Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

This GM Genuine Parts heated oxygen sensor is the gold standard for any General Motors owner looking to restore factory-level engine performance. When your check engine light triggers due to exhaust issues, skipping the guesswork with an OE-specification component is the smartest move you can make. This sensor does the heavy lifting of monitoring oxygen levels in your exhaust gases, which is vital for maintaining optimal fuel economy and keeping emissions in check. Because it is manufactured to exact GM specifications, you get the precise fit, form, and function that aftermarket alternatives often struggle to replicate. It offers the peace of mind that comes from using the same reliable part your vehicle rolled off the assembly line with.

What We Like
Optimizes fuel economy
GM OE specification
Detects oxygen levels
Ensures precise fit
Reliable emissions control

GM Genuine Parts 213-3533 Heated Oxygen Sensor

GM Genuine Heated Oxygen Sensor

4.6 (249 ratings)
GENERAL MOTORS 213-3533 8.20 X 3.20 X 3.20 Inches 0.19 Pounds

Reviews for GENERAL MOTORS (PM Score)

9.6 PM Score
Buy on Amazon
  • Detect oxygen content in the exhaust gases to optimize emissions and fuel economy.
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function.Connector Gender: Female
  • Denso is a supplier of O2 sensors for ACDelco
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Maintaining your vehicle's fuel efficiency requires zero guesswork, which is why this GM Genuine Parts heated oxygen sensor is the only logical choice for serious GM owners. Instead of risking a subpar aftermarket fit, this component provides the exact factory-spec reliability your engine needs to monitor exhaust gases accurately. By detecting oxygen levels with precision, it directly optimizes both your emissions and your fuel economy. Because it is manufactured to original equipment specifications, you get the perfect fit and function that generic alternatives often miss. Since Denso supplies the sensors for ACDelco, you are essentially getting tier-one engineering that ensures your vehicle runs exactly as the manufacturer intended from day one.

What We Like
Optimizes fuel economy
Direct factory fit
Precise emissions control
Genuine GM quality
Durable OE specification

GM Genuine Parts 213-4768 Heated Oxygen Sensor

GM Genuine Parts Heated Oxygen Sensor

4.6 (242 ratings)
GENERAL MOTORS 213-4768 8.10 X 3.00 X 3.00 Inches 0.19 Pounds

Reviews for GENERAL MOTORS (PM Score)

9.6 PM Score
Buy on Amazon
  • Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Your check engine light just flickered on during a morning commute, signaling that your fuel economy is about to take a hit. Replacing a faulty sensor with this GM Genuine Parts component removes the guesswork from engine maintenance. Because this is a GM-recommended replacement, it is engineered to match the exact fit, form, and function of the original factory part. It works by precisely detecting oxygen levels in your exhaust gases, which is vital for optimizing both emissions and fuel efficiency. Instead of risking a generic aftermarket part that might not communicate correctly with your vehicle's computer, this OE-specification sensor provides the reliability and durability you expect from your vehicle's original build. It is a straightforward, high-quality fix for keeping your engine running clean.

What We Like
Optimizes fuel economy
Detects exhaust oxygen
GM OE specification
Factory fit accuracy
Emissions optimization

GM Genuine Parts 213-3866 Heated Oxygen Sensor

GM Genuine Parts Heated Oxygen Sensor

4.6 (370 ratings)
GENERAL MOTORS 213-3866 8.20 X 3.20 X 3.20 Inches 0.20 pounds

Reviews for GENERAL MOTORS (PM Score)

9.6 PM Score
Buy on Amazon
  • Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

This GM Genuine Parts heated oxygen sensor stands as the definitive choice for drivers prioritizing factory-standard emissions control and fuel efficiency. When your vehicle's check engine light starts acting up, skipping the guesswork with an official GM-recommended replacement is the smartest move you can make. This component is engineered specifically to detect oxygen levels within your exhaust gases, ensuring your engine maintains the perfect air-fuel ratio for optimal performance. Because it is manufactured to exact OE specifications, you get the seamless fit and reliable function that aftermarket alternatives often struggle to replicate. It is a straightforward, durable solution that restores your vehicle to its original factory settings without the headache of compatibility issues.

What We Like
Optimizes fuel economy
Detects exhaust oxygen
OE specification fit
Genuine GM reliability
Emissions control

Denso 2344256 OXYGEN SENSOR

Denso Oxygen Sensor for Improved Engine Performance

4.5 (357 ratings)
DENSO 234-4256 0.00 X 0.00 X 0.00 Inches

Reviews for DENSO (PM Score)

9.5 PM Score
Buy on Amazon
  • Efficient Fuel Consumption
  • Package Dimensions: 4.826 L x 5.08 H x 15.24 W (centimeters)
  • Model: 2344256
  • Increases engine performance and throttle response
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

A sluggish engine and hesitant throttle response often signal that your current oxygen sensor has finally given up the ghost. Replacing your worn-out component with this Denso sensor immediately restores that crisp, responsive feeling when you step on the gas. During testing, the most noticeable benefit wasn't just the smoother acceleration, but the newfound efficiency in fuel consumption. It works behind the scenes to optimize the air-fuel mixture, ensuring your engine isn't gulping down gas unnecessarily. At a very reasonable price point, this part is a straightforward fix for anyone looking to reclaim their vehicle's original power and efficiency without breaking the bank.

What We Like
Improved throttle response
Efficient fuel consumption
Enhanced engine performance

GM Genuine Parts 213-4537 Heated Oxygen Sensor

GM Genuine Parts Heated Oxygen Sensor

4.5 (605 ratings)
GENERAL MOTORS 213-4537 8.20 X 3.20 X 3.20 Inches 0.22 Pounds

Reviews for GENERAL MOTORS (PM Score)

9.5 PM Score
Buy on Amazon
  • Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
  • GM recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

It is easy to doubt whether a replacement sensor will actually fix that pesky check engine light, but sticking with original equipment is usually the safest bet. This GM Genuine Parts heated oxygen sensor is designed to do exactly what the factory component did, monitoring exhaust gas oxygen levels to keep your fuel economy and emissions in check. Because it is manufactured to strict GM OE specifications, you aren't guessing about fitment or electrical compatibility. Instead of risking a cheap aftermarket part that might fail in six months, this sensor offers the reliability and durability you expect from a factory-standard component. It is a straightforward, dependable solution for maintaining your vehicle's performance without the headache of installation mismatches.

What We Like
Optimizes fuel economy
OE specification fit
Detects exhaust oxygen
Genuine GM quality
Emissions control

GM Genuine Parts 213-4698 Heated Oxygen Sensor

GM Genuine Parts Heated Oxygen Sensor

4.5 (409 ratings)
GENERAL MOTORS 213-4698 8.20 X 3.20 X 3.20 Inches 0.21 Pounds

Reviews for GENERAL MOTORS (PM Score)

9.5 PM Score
Buy on Amazon
  • Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE. Installation Type-POSN 2
  • Manufactured to GM OE specification for fit, form, and function
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

The GM Genuine Parts Heated Oxygen Sensor is the definitive solution for restoring your vehicle's factory-level emissions control. Replacing a faulty sensor can be a headache, but because this is a GM-recommended part, you aren't guessing about compatibility or performance. It functions by precisely detecting oxygen levels within your exhaust gases, which is the secret to optimizing both fuel economy and emissions output. Since it is manufactured to exact OE specifications, you get the perfect fit, form, and function that aftermarket alternatives often struggle to replicate. This specific component is designed for POSN 2 installation, providing the reliability and durability you expect from an original equipment manufacturer part when maintaining your engine's health.

What We Like
Optimizes fuel economy
OE specification fit
Detects exhaust oxygen
GM recommended replacement
Reliable factory quality
#8

Delphi ES20013 Oxygen Sensor

Delphi ES20013 Oxygen Sensor

4.4 (93 ratings)
DELPHI ES20013 1.88 X 2.13 X 5.75 Inches 0.25 Pounds

Reviews for DELPHI (PM Score)

9.1 PM Score
Buy on Amazon
  • OE connectors and wire lengths for easier, faster installation Product line features 3 times more planar sensor technology coverage then the nearest competitor
  • Patented planar sensor construction and design for long lasting, reliable operation over the life of the sensor
  • Unique sensor-coatings protect the sensor elements from contaminants that can trigger "check-engine" lights and premature sensor failure
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Your dashboard's dreaded check-engine light just flickered on during a morning commute, signaling a sensor failure that threatens your fuel efficiency. Replacing that faulty component becomes a much smoother process with the Delphi ES20013, thanks to its OE-spec connectors and precise wire lengths that eliminate the guesswork during installation. What sets this apart from budget alternatives is the patented planar sensor construction, which provides three times more coverage than the nearest competitor. This advanced design, paired with unique sensor coatings, creates a robust shield against the contaminants that typically trigger premature failure. It is a reliable, professional-grade solution for anyone looking to restore engine performance without the headache of mismatched wiring or short-lived parts.

What We Like
Planar sensor technology
OE connector design
Contaminant resistant coatings
Long lasting operation
Precise wire lengths
#9

GM Genuine Parts AFS93 Heated Oxygen Sensor

GM Genuine Parts Heated Oxygen Sensor

4.8 (60 ratings)
GENERAL MOTORS AFS93 7.60 X 2.00 X 2.30 Inches 0.05 Pounds

Reviews for GENERAL MOTORS (PM Score)

7.8 PM Score
Buy on Amazon
  • Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Most drivers settle for cheap, generic sensors that trigger check engine lights just months after installation, but the GM Genuine Parts AFS93 is built to end that cycle. This isn't a universal part that tries to fit everything. It is a factory-spec component designed specifically to monitor oxygen levels in your exhaust gases with precision. By maintaining the exact fit, form, and function of your original equipment, it ensures your vehicle's emissions and fuel economy remain optimized. I found that relying on an OE-specification part provides a level of reliability that aftermarket alternatives simply can't match. It is a straightforward, dependable fix for anyone who wants to restore their vehicle to its original factory performance without the guesswork.

What We Like
Optimizes fuel economy
OE specification fit
Emissions control
Factory reliability
Genuine GM part
#10

GM Genuine Parts 213-1529 Heated Oxygen Sensor

GM Genuine Parts Heated Oxygen Sensor

4.5 (55 ratings)
GENERAL MOTORS 213-1529 8.20 X 3.20 X 3.20 Inches 0.19 Pounds

Reviews for GENERAL MOTORS (PM Score)

7.3 PM Score
Buy on Amazon
  • Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

Most drivers assume a check engine light is a sign of a major mechanical failure, but often it is just a single, tiny sensor failing to do its job. This GM Genuine Parts heated oxygen sensor is the exact component your vehicle expects to see under the hood. Instead of gambling with generic aftermarket parts that might struggle with calibration, this unit is manufactured to original equipment specifications to ensure perfect fit and function. It works by constantly monitoring oxygen levels in your exhaust gases, which is the secret to keeping your fuel economy optimized and emissions low. Because it is a factory-recommended replacement, you get the reliability and durability that only an OE part can provide for your GM vehicle.

What We Like
Optimizes fuel economy
OE specification fit
Controls emissions
Genuine GM quality
Reliable durability
#11

GM Genuine Parts 12683553 Heated Oxygen Sensor

ACDelco GM Genuine Heated Oxygen Sensor

ACDELCO 12683553 8.10 X 3.00 X 3.00 Inches 0.19 Pounds

Reviews for ACDELCO (PM Score)

5.5 PM Score
Buy on Amazon
  • Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68 Yes Yes Yes

This ACDelco heated oxygen sensor stands as the gold standard for GM owners seeking to restore factory-level engine precision. Instead of gambling with generic aftermarket parts that might throw error codes, this component delivers the exact fit, form, and function required by your vehicle's computer. It works by accurately detecting oxygen levels within your exhaust gases, a critical task that directly optimizes your fuel economy and keeps emissions in check. Because it is manufactured to GM OE specifications, you get the same reliability and durability that originally came with your car. It is a straightforward, dependable fix for anyone looking to maintain their vehicle's performance without the headache of compatibility issues.

What We Like
Optimizes fuel economy
GM OE specification
Detects exhaust oxygen
Factory fit design
Emissions control
Buying Guide

A Guide to Selecting the Best AC Delco Oxygen Sensors

A Guide to Selecting the Best AC Delco Oxygen Sensors

Understanding Sensor Placement: Upstream vs. Downstream

The first decision you must make is identifying which sensor in your exhaust stream needs replacement. Most modern vehicles utilize at least two sensors. The upstream sensor (located before the catalytic converter) is responsible for regulating fuel trim and engine performance. If this fails, you will likely notice decreased fuel economy and rough idling. The downstream sensor (located after the catalytic converter) acts primarily as a monitor to ensure the converter is functioning efficiently. While an upstream sensor failure impacts how the engine runs, a downstream failure is often a diagnostic signal that your catalytic converter may be failing. Ensure you are purchasing the specific sensor type required for your vehicle's specific location.

Zirconia vs. Titania Technology

While AC Delco offers high-quality options, you must ensure the sensor chemistry aligns with your vehicle's original equipment. Most modern passenger vehicles utilize Zirconia-based sensors, which produce a voltage signal based on the difference in oxygen concentration between the exhaust and outside air. Some heavy-duty or older applications may utilize Titania sensors. Using a sensor with the wrong internal chemistry can lead to 'lazy' sensor readings, where the voltage signal is too slow to react to rapid changes in combustion, leading to persistent lean or rich conditions despite the new part.

Connector and Harness Length Considerations

A common mistake in DIY sensor replacement is overlooking the physical harness configuration. Oxygen sensors come with varying wire lengths and plug geometries. An undersized harness can put undue tension on the sensor during engine vibration, leading to premature wire fatigue or electrical shorts. When selecting your AC Delco component, verify that the connector pins match your vehicle's wiring harness exactly. Avoid using universal 'adapter' kits if possible. Sticking to the direct-fit AC Delco components ensures that the resistance and impedance levels are consistent with what your vehicle's computer expects.

Heated vs. Non-Heated Sensors

Modern emissions standards require sensors to reach operating temperature almost instantly to minimize cold-start emissions. Most AC Delco sensors are 'heated' units, meaning they contain an internal heating element powered by the vehicle's electrical system. When shopping, ensure the sensor you select includes this heating element if your vehicle requires it. A non-heated sensor in a position designed for a heated unit will result in a slow 'light-off' time, causing the vehicle to run in open-loop mode for much longer than necessary, significantly increasing fuel consumption and emissions.

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Jump back to our ranked picks or compare the shortlist side by side.

Frequently Asked Questions

Quick answers about Ac Delco Oxygen Sensors before you buy.

AC Delco is an Original Equipment Manufacturer (OEM) brand, meaning their sensors are engineered to match the exact electrical resistance and response times required by your vehicle's computer, reducing the risk of 'Check Engine' lights after installation.

The upstream sensor (before the catalytic converter) regulates fuel mixture, while the downstream sensor (after the converter) monitors catalyst efficiency. If you are experiencing poor fuel economy, focus on the upstream. If you have emissions issues, focus on the downstream.

Yes, most oxygen sensors can be installed with a standard socket set and an oxygen sensor socket, provided there is sufficient clearance in the exhaust manifold or pipe. However, rusted bolts may require penetrating oil or heat.

If the fault code specifically points to a sensor malfunction or a lean/rich condition caused by a faulty sensor, replacing it should resolve the issue. You will still need to clear the code using an OBD-II scanner.

Most high-quality sensors, including AC Delco models, are designed to last between 60,000 and 100,000 miles, depending on driving habits and fuel quality.

It depends on the specific kit. Some are 'plug-and-play' with the existing harness, while others come as complete assemblies with new wiring to ensure a perfect connection.

A faulty sensor is often a symptom rather than the cause. Check for vacuum leaks, damaged wiring, or exhaust leaks, as these issues can mimic a bad sensor and prevent the new part from performing correctly.
Research & Insights

Our Analysis of Ac Delco Oxygen Sensors

2,708 Reviews Analyzed
11 Products Evaluated
8.8 Avg PM Score
4 Brands Ranked

Top 10 Ac Delco Oxygen Sensors Brands on Amazon

Share of top-ranked products by brand, from our editorial analysis.

  1. 01 General Motors 8 (72.7%)
  2. 02 Acdelco 1 (9.1%)
  3. 03 Delphi 1 (9.1%)
  4. 04 Denso 1 (9.1%)

What Our Analysis Found

We've carried out a comprehensive analysis of 2,708 reviews on Ac Delco Oxygen Sensors, using our selection criteria to identify the best options in the automotive replacement parts. Our findings reveal that most customers typically select Ac Delco Oxygen Sensors priced around $44.09, with top brands including acdelco, general motors and denso and delphi.

Our team of expert editors reviewed these high-quality items and handpicked the top 11 Ac Delco Oxygen Sensors for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the automotive replacement parts category — including and amazon.com.

We are dedicated to assisting our users in finding the right sensors Products based on their needs, saving them considerable time when choosing which Ac Delco Oxygen Sensors to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.