Oxygen Sensor for 2001-2003 Mazda Protege & More - DENSO 234-4721

$127.99

DENSO Auto Parts Oxygen Sensor 234-4721 - view 2

Part number: 234-4721

UPC: 042511110748

Condition: New

Weight: 0.30 LBS

Item Package Code: EA

Part Has Core (Y/N): N

Item Package Quantity: 1

$127.99

Current Stock: 6

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DENSO Auto Parts Oxygen Sensor P/N:234-4721

$127.99

Description

DENSO Auto Parts 234-4721 oxygen sensor for the 2001-2003 Mazda Protege 4-cylinder 2.0L and other vehicles measures the oxygen in the exhaust so the engine computer can adjust the air-fuel ratio. This is the upstream sensor, so it reads exhaust gas ahead of the catalytic converter.

Laser-welded stainless housing that resists corrosion
PTFE filter that blocks contaminants under harsh engine conditions
Dual-layer protection around the ceramic element for fast, reliable response times
Aluminum oxide trap layer that protects the ceramic element from silicone and lead poisoning
Heated, narrow-band sensor with 4 wires and a threaded mount

Quick facts

Part: DENSO Auto Parts 234-4721 oxygen sensor
Fits: 2001-2003 Mazda Protege 4-cylinder 2.0L and other vehicles
Position: Upstream
Condition: New

A worn oxygen sensor can show up as a check engine light, poor fuel economy or a rough idle. Before you replace it, rule out wiring damage and exhaust leaks near the sensor, since either can skew its readings. If the sensor is the cause, this one replaces it.

Fits

This oxygen sensor fits the 2001-2003 Mazda Protege 4-cylinder 2.0L and the 2002-2003 Mazda Protege5 4-cylinder 2.0L. This listing is one sensor, and the 2001-2003 Mazda Protege 4-cylinder 2.0L takes one.

Specifications

Fit and size

Position: upstream
Quantity per vehicle: 1
Thread diameter: 0.708 in
Wiring harness length: 9.45 in
Wires: 4
Connector: female

Build and materials

Sensor type: heated, narrow-band
Mounting type: threaded
Housing: laser-welded stainless
Condition: new
Country of origin: United States

Manufacturer's description

Product specs

Vehicles it fits

Interchange numbers

This part cross-references / interchanges with the following part numbers:

213-1490, OS1794, 13870, ES20145, FS7N18861, FS7N188619U, 22533, SG1040, 250-241126, 350-34688

Buyer's Q&A

Frequently Asked Questions

Will this oxygen sensor fit the 2002-2003 Mazda Protege5 4-cylinder 2.0L?

Yes. DENSO Auto Parts 234-4721 fits the 2002-2003 Mazda Protege5 4-cylinder 2.0L, and that engine takes one upstream sensor.

Is this DENSO Auto Parts oxygen sensor heated?

Yes. DENSO Auto Parts 234-4721 is a heated, narrow-band sensor with four wires and a threaded mount.

How long is the harness on this upstream oxygen sensor, and what is its thread size?

The wiring harness is 9.45 in long and the thread diameter is 0.708 in. The connector is female.

How can I tell if this upstream oxygen sensor is wearing out?

A check engine light, poor fuel economy or a rough idle can mean a worn sensor, though each can have other causes. A shop can read the sensor's signal with a scan tool.

What protects the ceramic element in this oxygen sensor?

A PTFE filter blocks contaminants, and dual-layer protection shields the ceramic element. An aluminum oxide trap layer guards it from silicone and lead poisoning.