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
Application Specific Design: No modifications and pre-calibrated
Isotatic-pressed and plasma-sprayed for extended service life
Double-Layered 310S Stainless Steel: Additional protection from moisture and debris
Restored Engine Performance: Improved fuel economy and lower emissions
Description
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?
Upstream location is between the catalytic converter and the engine
Downstream location is between the catalytic converter and the tailpipe
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.
Mazda 3 L4 2.0L with California Emissions Downstream Bank 1 Sensor 3 O2 Oxygen Sensor TRQ OSA61785
2004-2007
Mazda
3
Mazda 3 L4 2.0L with California Emissions Center Bank 1 Sensor 2 O2 Oxygen Sensor TRQ OSA61785
2006
Mazda
3
Mazda 3 L4 2.3L with California Emissions Center Bank 1 Sensor 2 O2 Oxygen Sensor TRQ OSA61785
2006
Mazda
3
Mazda 3 L4 2.3L with California Emissions Downstream Bank 1 Sensor 3 O2 Oxygen Sensor TRQ OSA61785
2007-2008
Mazda
3
Mazda 3 L4 2.3L Naturally Aspirated with California Emissions Center Bank 1 Sensor 2 O2 Oxygen Sensor TRQ OSA61785
2007-2008
Mazda
3
Mazda 3 L4 2.3L Naturally Aspirated with California Emissions Downstream Bank 1 Sensor 3 O2 Oxygen Sensor TRQ OSA61785
2008
Mazda
3
Mazda 3 L4 2.0L Center Bank 1 Sensor 2 O2 Oxygen Sensor TRQ OSA61785
2009
Mazda
3
Mazda 3 L4 2.3L Naturally Aspirated with California Emissions Downstream Bank 1 Sensor 2 O2 Oxygen Sensor TRQ OSA61785
2009
Mazda
3
Mazda 3 L4 2.3L Naturally Aspirated with California Emissions Center O2 Oxygen Sensor TRQ OSA61785
2009
Mazda
3
Mazda 3 L4 2.0L with California Emissions Downstream Bank 1 Sensor 2 O2 Oxygen Sensor TRQ OSA61785
2009
Mazda
3
Mazda 3 L4 2.0L with California Emissions Center O2 Oxygen Sensor TRQ OSA61785
2006
Mazda
6
Mazda 6 L4 2.3L with California Emissions Automatic Transmission Downstream Bank 1 Sensor 3 O2 Oxygen Sensor TRQ OSA61785
2007-2008
Mazda
6
Mazda 6 L4 2.3L with California Emissions Automatic Transmission Downstream Bank 1 Sensor 2 O2 Oxygen Sensor TRQ OSA61785
Part Interchange
Brand Label
Part Number
Walker Products
250-24676
Delphi
ES20362
Standard Motor Products
SG1677
Standard Motor Products
SG1683
Mazda
LF6918861D9U
DENSO
DOX0332
OMNIPARTS
19060349
Beck/Arnley
156-4361
Bosch
15916
Mazda
K42384871
DENSO
234-4329
Bosch
15914
Mazda
LF6718861A
Niehoff
FE80862
Mazda
L39718861A
Mazda
ZJ3918861B
Mazda
L32F18861A
Mazda
Z60218861A
Mazda
K42384900
ACDelco
213-3921
Mazda
ZYF118861
Mazda
LF69-18-861D
Mazda
LF6918861C
Mazda
LF6918861B
Mazda
ZJ2118861
Mazda
LF6718861A9U
Standard Motor Products
SG1669
Bosch
15772
Niehoff
FE80868
Mazda
ZJ3918861A
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.
Product Reviews
5.0/ 5
★★★★★★★★★★
1 review
5★
100%
4★
0%
3★
0%
2★
0%
1★
0%
★★★★★September 17, 2019
2007 Mazda 3 2.3 Calif Emission
Install it in under 40 min. Engine light turn off after 4 time turning it on. It's been about a month and so far light hasn't turn on. Remember if your car has Calif sticker under the hood, it will have 2 sensor after cat, one under between passenger and driver side and the other one is going to be around the middle of the car. USE JACK STANDS when getting under the car.
Showing 1–1 of 1 review
OSA61785
In Stock
Customer Q&A
Got a question about this part? Post it and get answers from our team.
ShemarSeptember 14, 2022
Is this downstream or upstream? I have a 2007 Mazda 3 2.0L
This sensor is for the 'center' and 'downstream' locations on models with a 2.0L engine and California Emissions.
Jessica · September 14, 2022
RAYNNIERJune 17, 2022
02 sensor downstream mazda 3 2005 hatch is this downstream?
Yes, this part will fit your vehicle and will be for the downstream.
Emma · June 17, 2022
VincentAugust 15, 2021
Is this upstream or downstream sensor? I have a 2008 Mazda 3 i
This is the downstream/center sensor, it is not the upstream sensor for your application.
T · August 16, 2021
OllieJanuary 7, 2020
Is this upstream or downstream sensor?
Look at the connectors they are different between the upstream and the downstream. Same sensor just different connections as far as I could tell.
Brant · January 10, 2020
Showing 1–4 of 4 questions
Customer service
877-844-3393
Monday - Friday 8:00am - 9:30pm ET Saturday - Sunday 8:00am - 4:30pm ET
Ask a Question
Check Your Email
We sent a verification email to .
Click the Verify Email button in the email to submit your question.
This extra step helps prevent spam.
Select Your Vehicle
Specify your vehicle's year, make and model to guarantee fit.
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.