Is the upstream for 2003 chevy silverado 1500 5.3 the same part # as the downstream?

they are diffrent in design yes the 2 upstream are bank 1 sensor 1 & 2 downstream are bank 2 sensor 1 & 2

I've seen this described as a "male connector".. but isn't that a female? It looks like something goes IN the white part??

No this is consider a male connector.

Does it have the connector already on the wires?

Yes. The plug is already spliced in just like a factory unit. Completely plug and play install.

I have a 03 silverado. i wanna replace all 4 o2 sensors. guy at autozone said i need 3 of this part number and the center ones different?

My 05 5.3 Silverado called for all four of them to be this part number. I installed them and everything has worked perfectly since!

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Description

🚗 Upgrade your ride with Bosch precision – because your engine deserves the best!

DECADES OF INNOVATION - Leverage Bosch’s legacy since the 1960s for unmatched sensor reliability.
PLUG PLAY INSTALLATION - Pre-coated threads and OE connectors make upgrades hassle-free and fast.
FACTORY TESTED EXCELLENCE - Every sensor undergoes 100% functional testing for guaranteed performance.
RAPID RESPONSE TECHNOLOGY - Heats up in seconds to optimize engine efficiency and reduce emissions.
DURABILITY MEETS PRECISION - Sealed stainless steel body resists exhaust damage for extended lifespan.

The BOSCH 15284 Premium OE Fitment Oxygen Sensor is engineered with decades of Bosch expertise, featuring a double laser-welded stainless steel body for durability, a fast-acting heater that reaches operating temperature within 2 seconds, and true OE direct-fit connectors for seamless installation. Compatible with select 2003-06 Buick, Cadillac, Chevrolet, GMC, and Isuzu vehicles, this sensor ensures optimal engine performance, reduced emissions, and long-lasting reliability.

Specifications

Brand	Bosch
Item dimensions L x W x H	2.2 x 1.97 x 5.83 inches
Material	Stainless Steel
Item Weight	0.15 Pounds
Style	Oxygen Sensor
Maximum Supply Voltage	5 Volts
Measurement Accuracy	High Accuracy
Measuring Range	4.5 - 5.5 V
Mounting Type	Flange Mount
Output Type	NPN
Response Time	2 seconds
Specific Uses For Product	Temperature
UPC	028851152846
Global Trade Identification Number	00028851152846
Manufacturer	BOSCH
Model	Oxygen Sensor
Item Weight	2.4 ounces
Product Dimensions	2.2 x 1.97 x 5.83 inches
Item model number	F00HL00111
Is Discontinued By Manufacturer	No
Exterior	Machined
Manufacturer Part Number	15284
OEM Part Number	8125731670

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