★★★★★
June 20, 2026
Great parts
Perfect fit. Great quality product. Fast shipping.
Replaces
About TRQ:
TRQ is a trusted brand dedicated to making every repair a success story by combining premium parts with easy installation. Each TRQ part is engineered by a team of automotive experts to meet or exceed OEM standards, delivering enhanced performance and maximum longevity. With rigorous in-house testing, the brand ensures superior fit and function across every product line. TRQ also provides customers with best-in-class, step-by-step installation videos—so you can complete repairs with confidence, whether you're a first-time DIYer or an industry professional.
Product Features
TRQ oxygen sensors are manufactured to precise specifications using premium raw materials to optimize your vehicle’s emission system. Each sensor is isostatically-pressed for improved strength and durability, and plasma-sprayed to improve sensitivity and prolong the service life of the sensors. Oxygen sensors wear out over time and should be replaced every 60,000 miles to prevent poor engine performance. TRQ recommends replacing the oxygen sensors in sets to optimize fuel economy and reduce overall emissions. All products are fit and road-tested in our Massachusetts R&D facility to ensure we deliver on our promise of Trusted Reliable Quality.
What is Upstream vs. Downstream?
Install Tip: You may be required to reset the vehicle computer after installation of this part.
Returns: Parts with electrical components cannot be returned once installed.
Attention California Customers:
WARNING: This product can expose you to chemicals including Lead and Lead Compounds, which are known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
This part fits 35 vehicles spanning 2014-2020.
| Year | Make | Model | Description |
|---|---|---|---|
| 2015 | Cadillac | Escalade | Cadillac Escalade V8 6.2L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2015 | Cadillac | Escalade ESV | Cadillac Escalade ESV V8 6.2L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2016-2020 | Chevrolet | Express 2500 Van | Chevrolet Express 2500 Van V8 6.0L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2016-2017 | Chevrolet | Express 2500 Van | Chevrolet Express 2500 Van V8 4.8L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2018-2019 | Chevrolet | Express 2500 Van | Chevrolet Express 2500 Van V6 4.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2016-2020 | Chevrolet | Express 3500 Van | Chevrolet Express 3500 Van V8 6.0L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2016 | Chevrolet | Express 3500 Van | Chevrolet Express 3500 Van V8 4.8L with Oval Plug Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2017 | Chevrolet | Express 3500 Van | Chevrolet Express 3500 Van V8 4.8L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2018-2020 | Chevrolet | Express 3500 Van | Chevrolet Express 3500 Van V6 4.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2016 | Chevrolet | Express 4500 | Chevrolet Express 4500 V8 6.0L Gas Engine excluding Flex Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2017 | Chevrolet | Express 4500 | Chevrolet Express 4500 V8 6.0L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2018 | Chevrolet | Express 4500 | Chevrolet Express 4500 V8 6.0L Gas Engine excluding Flex Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2019 | Chevrolet | Express 4500 | Chevrolet Express 4500 V8 6.0L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2014-2019 | Chevrolet | Silverado 1500 | Chevrolet Silverado 1500 V6 4.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2014-2016 | Chevrolet | Silverado 1500 | Chevrolet Silverado 1500 V8 5.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2014-2019 | Chevrolet | Silverado 1500 | Chevrolet Silverado 1500 V8 6.2L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2019 | Chevrolet | Silverado 1500 | Chevrolet Silverado 1500 V8 5.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2015 | Chevrolet | Suburban | Chevrolet Suburban V8 5.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2015 | Chevrolet | Tahoe | Chevrolet Tahoe V8 5.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2016-2020 | GMC | Savana 2500 Van | GMC Savana 2500 Van V8 6.0L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2016-2017 | GMC | Savana 2500 Van | GMC Savana 2500 Van V8 4.8L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2018-2020 | GMC | Savana 2500 Van | GMC Savana 2500 Van V6 4.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2016 | GMC | Savana 3500 Van | GMC Savana 3500 Van V8 4.8L with Oval Plug Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2016-2020 | GMC | Savana 3500 Van | GMC Savana 3500 Van V8 6.0L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2017 | GMC | Savana 3500 Van | GMC Savana 3500 Van V8 4.8L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2018-2020 | GMC | Savana 3500 Van | GMC Savana 3500 Van V6 4.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2019 | GMC | Savana 4500 | GMC Savana 4500 V8 6.0L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2014-2016 | GMC | Sierra 1500 | GMC Sierra 1500 V8 5.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2014-2019 | GMC | Sierra 1500 | GMC Sierra 1500 V8 6.2L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2014-2019 | GMC | Sierra 1500 | GMC Sierra 1500 V6 4.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2019 | GMC | Sierra 1500 | GMC Sierra 1500 V8 5.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2015 | GMC | Yukon | GMC Yukon V8 5.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2015 | GMC | Yukon | GMC Yukon V8 6.2L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2015 | GMC | Yukon XL | GMC Yukon XL V8 5.3L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| 2015 | GMC | Yukon XL | GMC Yukon XL V8 6.2L Upstream & Downstream 4 Piece O2 Oxygen Sensor Set TRQ OSA61839 |
| Brand Label | Part Number |
|---|---|
| ACDelco | 12661898 |
| ACDelco | 12655678 |
| ACDelco | 12659516 |
| ACDelco | 12666612 |
| ACDelco | 12657188 |
| DENSO | 234-4940 |
| ACDelco | 12643708 |
| DENSO | 234-4974 |
| Walker Products | 250-241132 |
| DENSO | 234-4762 |
| Walker Products | 250-241162 |
This item may be interchangeable with parts from other brands with the above part numbers. This information is provided only for reference and does not guarantee that the item you are purchasing is identical to parts with part numbers from the brands listed above. To confirm that this item fits your vehicle, use the above "Check Vehicle Fit" option.
Lifetime Warranty
This item is backed by our limited lifetime warranty. In the event that this item should fail due to manufacturing defects during intended use, we will replace the part free of charge. This warranty covers the cost of the part only.
Returns: Parts with electrical components cannot be returned once installed.
FREE Shipping is standard on Orders shipped to the lower 48 States (Contiguous United States). Standard shipping charges apply to Hawaii, Alaska and US Territories. Shipping is not available to Canada.
Expedited is available on checkout to the United States, excluding Alaska, Hawaii and US Territories as well as P.O. Boxes and APO/FPO/DPO addresses. Final shipping costs are available at checkout.
Perfect fit. Great quality product. Fast shipping.
Quality product after 2 weeks I'm getting diagnostic trouble code P2097 which is where bank 2 detects the correction limit for a condition causing a lean air / fuel ratio was greater than the maximum allowable limit. And one of the top fixes is bank 2 sensor 2 O2 sensor. So I could have just got a dud
One of the sensor is faulty.
Both rear o2 sensors threw codes within 500 miles. I reached out to get them exchanged and got no reply. Would not recommend these and still have not received a reply a month later.
installed these with a new Magnaflow OEM compliant cat. Got rich post-cat codes on both downstream sensors that I didn't have before. I'm not the first reviewer to report this exact problem. Swapped out with OEM and the codes cleared. A bit later I got codes on bank 2 only for fuel trim imbalance, implicating the upstream sensor. Had rough idle codes and misfires as well. Replaced bank 2 upstream with OEM. They are very different visually, and functionally. Codes cleared on their own and idles and runs perfect now. Still have one of these sensors installed on bank 1 upstream with no issues. So they work, sometimes. Buyer beware. Knowing what I know now I would not buy again, just get OEM replacements and be done with it.
One of the sensors was defective. Am I able to return the one and get a replacement?
Excellent
Worked and fit as expected
Installed all 4 brand new sensors and getting 2 errors for bank 1 and bank 2 after installation
Sensors work great and received rapidly
OSA61839
This part will not fit your vehicle, but we may have a part that is listed to fit. Please enter your vehicle's year make and model in the search bar at the top of the page. This will display parts guaranteed to fit your vehicle. Just be sure to verify all of the information shown in the Vehicle Fit tab before ordering.
Yes, these parts are listed to fit the 2015 Chevrolet Silverado 1500 V8 5.3L.
Thank you for your inquiry! Please see below: 1AEOS02006 - upstream 1AEOS02008- downstream
Currently, we do not carry this part for your vehicle. We're always updating our inventory so please check back soon!
Defect item sensor light still on on my truck reading one of the sensors
Upon receipt there should be part numbers that start with "1A." The downstream will be 1AEOS02006, and the upstream are 1AEOS02008.
The plugs are different on upstream and downstream the notch inside plug is in different place on upstream compared to downstream
