Upstream & Downstream O2 Sensors Oxygen Sensor for  GMC Isuzu Pontiac SG1856 - AFA-Motors
Upstream & Downstream O2 Sensors Oxygen Sensor for  GMC Isuzu Pontiac SG1856 - AFA-Motors
Upstream & Downstream O2 Sensors Oxygen Sensor for  GMC Isuzu Pontiac SG1856 - AFA-Motors
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Upstream & Downstream O2 Sensors Oxygen Sensor for GMC Isuzu Pontiac SG1856

In stock
Fuel Systems

Upstream & Downstream O2 Sensors Oxygen Sensor for GMC Isuzu Pontiac SG1856

Product description:

Brand New Oxygen Sensor
Direct Fit
Correct Connector No cutting or splicing
Correct wire length (16.86 Inches)
Upstream or Downstream Sensor
as listed per application
4 wire configuration
Replaces dealer part numbers: 12558850, 12559850, 12561776, 12562943, 12567127, 12567254, 12590789, 8125671270, 81256 71270, 8972873520, 89728 73520, 97287352, 972873520
Built and tested to strict quality control standards
Note: For clarification purposes:
Upstream location is between the catalytic converter and the engine
Downstream location is between the catalytic converter and the tailpipe
If you have a bad O2 sensor causing your vehicle to fail an emission test then this is the part for you.
The parts are subject to strict quality control testing . Once the item has been installed or plugged in, it is no longer eligible for a refund. The item may be eligible for replacement, only if it is found to have a manufacturing defect. Before purchasing, please ensure proper diagnosis of the failed original part is performed
Note: You may be required to reset the vehicle¡¯s computer after installation of this part.
Installation Instruction:
Pry out the clip and pin from the sensor
Disconnect the O2 sensor harness
Cut off the harness connector and sensor with wire cutters
Remove the O2 sensor wire with a 7/8 wrench
Twist on the O2 sensor to the exhaust pipe
Tighten the O2 sensor with a 7/8 wrench
Reconnect the O2 sensor harness
Replace the pin and re-clip the harness to the vehicle
Tools needed for replacement:
Pliers, Cutters & misc Wrenches
Wire Cutters
Screwdrivers & Related
Flat Blade Screwdriver
Wrenches - SAE
7/8 Inch Wrench
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When you buy from AFA Motors, you can rest assured that you'll get the right part for your vehicle, or we'll make it right.

Free Return Shipping on Exchanges

We'll pay for the return shipping on exchanges for all orders (even gifts with proof of purchase).

Plus every purchase comes with our 1-year lower price guarantee and expert service from our team of Gearheads.

It's our commitment to you, exclusively from

Some restrictions apply. See terms below.

How to Return an Item

Step 1: Start a Return from Your Online Account

Please log in to your account. Locate and click on your order under Order History. Find the item you wish to return or exchange and click on Return Item to submit your request.

Step 2: Receive a Return Authorization Number (RMA#)

One of our customer care specialists will provide you with:

  • An RMA#
  • An email with detailed return shipping instructions

Step 3: Pack & Ship

Pack everything that came with the product using its original packaging.

  • Affix the return shipping label that we provided to the package. If we didn't provide you with a return shipping label, make sure to include the RMA# on the package.
  • Ship the package to the address specified in the email you received from Step 2.

Step 4: Receive Your Refund or Exchange

After we receive your package, we'll process your refund or exchange immediately. You can expect to see the refund, less any applicable restocking fees, credited within 5-7 business days, to the payment method that you used when you originally placed your order. If you selected an exchange, we will ship you replacement item out immediately.

Restocking Fees

All returns are subject to a 20% restocking fee.

We'll waive the restocking fees if we made a mistake or if the product was delivered defective.

We'll also waive the restocking fee if you decide to exchange your product with another purchase.

Frequently Asked Questions

Which products can be returned or exchanged?

Most products can be returned within 30 days of purchase, provided it is returned in original packaging and the items are in new and unused condition. We reserve the right to charge up to the full value of the product for items not received in this condition.

Products that cannot be returned or exchanged:

  • Some products, including, but not limited to, custom patterned and custom, and painted items are not returnable
  • Products that shipped via freight, typically oversized and heavy items.
  • Products that have been installed on your vehicle
  • Products that have been modified (drilled or altered in any way)

Under what conditions may I return an item?

Defective Product

While we pride ourselves in our partnerships with leading vendors, accidents happen. Call us at (800) 874-8888 option #2 once you've discovered the defect, and we'll straighten it out.

Damaged Product

Occasionally packages in transit can become damaged. Call us right away so we can set it straight.

Incorrect Product

If you've received an incorrect product, or if we've guaranteed fitment on your order, and the product does not fit your vehicle, give us a call at (800) 874-8888 and select option #2, and we'll start the return process for you.

Lost Package

If your tracking information says delivered, but you haven't received your package yet, let us know. We will work with the carrier to get to the bottom of it.

Do I have to pay for return shipping?

Returns happen, and we're here to make the experience easy! In most cases, you are responsible for return shipping, but we can offer you a discounted return shipping label. If your item arrived defective or we made a mistake, we will happily take care of the return shipping.

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