How many sensors are needed for 2015 chevy impala 3.6 v6 flex fuel lfx engine?

They are 4 sensor in total. Two for each catalyst converter.

What size socket do these require?

You will need 7/8-inch (22mm) Offset Oxygen Sensor Socket. Thank you for contacting us

Does this 02 sensor come with the removable tool ?

this will not come with it, you have to buy it eleswhere

How do I specify that I need them for downstream ?

Your downstream O2 sensor looks different from your upstream. So you need to look at the ones you have on there now. But,from my experience it is best to buy a set of the same brand than to mix name brand sensors. UsE all 4 of th e we m rename the brand sensor on my your vehicle. Hope this helps you. Very Respectful, Customer

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Vinrold Oxygen O2 Sensor Downstream or Upstream for 3.6L GMC Acadia Chevy Camaro Colorado Equinox Impala Cadillac CTS SRX STS Buick Enclave Suzuki XL-7| 250-24773

Vinrold Oxygen O2 Sensor Downstream or Upstream for 3.6L GMC Acadia Chevy Camaro Colorado Equinox Impala Cadillac CTS SRX STS Buick Enclave Suzuki XL-7| 250-24773

Product ID: 369756878

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Details

Brand
Vinrold
Style
Modern
Mounting type
Flange Mount
Specific uses for product
Oxygen O2
Manufacturer
Vinrold

🔥Premium sensor longevity

🧪100% factory tested quality

⚙️Direct-fit OE connectors

Description

⚡ Upgrade your engine’s brain with precision sensing!

TESTED TO PERFECTION - 100% factory-tested with seared protection tube ensuring reliable operation under extreme conditions.
VERSATILE COMPATIBILITY - Fits upstream or downstream O2 sensor needs for multiple GM and Suzuki models—check fitment filter to avoid guesswork.
PRECISION FIT ZERO HASSLE - Guaranteed direct-fit OE connectors and harness for seamless installation.
OPTIMIZE YOUR RIDES EFFICIENCY - Accurate oxygen sensing for improved fuel economy and reduced emissions—stay ahead of maintenance.
BUILT TO LAST DRIVE WITH CONFIDENCE - Premium sensor design engineered to extend sensor lifespan and performance.

The Vinrold Oxygen O2 Sensor is a premium, factory-tested replacement part designed for 3.6L engines in select GMC, Chevy, Cadillac, Buick, and Suzuki models. Featuring direct-fit OE connectors and a durable sensor design, it ensures reliable, long-lasting performance for both upstream and downstream applications, optimizing engine efficiency and emissions control.

Specifications

Brand	Vinrold
Style	Modern
Mounting Type	Flange Mount
Output Type	electrical signal
Specific Uses For Product	Oxygen O2 Sensor
Manufacturer	Vinrold
Item Weight	5.3 ounces
Package Dimensions	5.94 x 2.44 x 2.44 inches
Item model number	250-24773
Manufacturer Part Number	24773 - 250V