Does it have a 4 flat or 4 square plug?

Hi Justin it is a 4 square plug. Here is the picture from the Densoautoparts website:http://densoautoparts.com/find-my-part/vehicle-selection. You can put your car's (or truck) year. make,ect. and get the sensor's picture from clicking a camera symbol. Hope this helps. I am a big fan of denso (used to be nippondenso) parts. Quality stuff and not too pricey.

03 Chevy Monte Carlo downstream 3800 will it fit

It fit my 1999 Pontiac Bonneville with the 3800,works great

Does the sensor come with wiring harness and plug

No. Wiring the old connector was not difficult, but you must be careful choosing the right wires as colors were not the same as my 2003 Buick. More importantly, the output didn't match and I replaced it with OEM ACDelco that worked perfectly.

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Specifications

Brand	Denso
Item dimensions L x W x H	5.75 x 2.19 x 1.88 inches
Material	Stainless Steel, Zirconium
Item Weight	0.25 Pounds
Style	Replacement Part
Measurement Accuracy	±1.5%
Mounting Type	Surface Mount
Output Type	electrical signal
Sensing Distance	5 Centimeters
Specific Uses For Product	Replacement Oxygen (O2) Sensor
Upper Temperature Rating	1000 Degrees Fahrenheit
UPC	042511140189
Global Trade Identification Number	00042511140189
Manufacturer	Denso
Model	Oxygen Sensor
Item Weight	4 ounces
Product Dimensions	5.75 x 2.19 x 1.88 inches
Item model number	234-4018
Is Discontinued By Manufacturer	No
Exterior	Machined
Manufacturer Part Number	234-4018
OEM Part Number	234-4018

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