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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⚡ Upgrade your ride with precision sensing power!

LIGHTWEIGHT COMPACT - Slim 113g design fits seamlessly without added bulk
OE STANDARD PRECISION - Manufactured to exact Original Equipment specs for perfect fit and function
EFFORTLESS INSTALLATION - 4-wire female plug design ensures quick, no-fuss setup
FUEL EFFICIENCY MAXIMIZED - Optimizes engine performance to save fuel and cut emissions
DURABLE HIGH QUALITY BUILD - Crafted from premium materials for long-lasting reliability

The Denso 234-4018 Oxygen Sensor is a precision-engineered downstream sensor designed specifically for GM vehicles. Featuring a 4-wire female plug for easy installation, it enhances fuel efficiency and engine performance while meeting strict OE quality standards. Lightweight and durable, this sensor ensures reliable, long-term operation to keep your vehicle running clean and smooth.

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Manufacturer	Denso
Brand	Denso
Model	Oxygen Sensor
Product Dimensions	14.61 x 5.56 x 4.78 cm; 113.4 g
Item model number	234-4018
Exterior	Machined
Manufacturer part number	234-4018
OEM Part Number	234-4018
Item Weight	113 g

Denso 234-4018 Oxygen Sensor for GM Downstream with 4-Wire Female Plug

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