NGK 22101 O2 sensor for the 2003-2005 Mazda 6 4-cylinder 2.3L gives the ECU closed-loop feedback on the air-fuel ratio. As an oxygen sensor, it also lets the OBDII system flag possible fuel delivery or catalytic converter efficiency problems.
A failing O2 sensor can show up as a check engine light or a change in fuel economy, though other faults cause the same signs. Before replacing it, look over the sensor's wiring and connector for damage with the engine off and fully cold; a shop can test the sensor itself.
This direct-fit sensor is made for the 2003-2005 Mazda 6 4-cylinder 2.3L (L4-2.3L), and that engine takes one. The listing is a single sensor, so one covers the car.
Fit and size
Build and materials
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Is NGK 22101 the right sensor for the 2003-2005 Mazda 6 4-cylinder 2.3L?
Yes. NGK 22101 is listed for the 2003-2005 Mazda 6 4-cylinder 2.3L, and that engine takes one sensor.
Does this O2 sensor come with a connector?
Yes. It comes with water-resistant connectors and harness accessory hardware for easy installation.
What size is the hex on this O2 sensor?
The hex size is 7/8" (22mm).
Is the NGK 22101 a heated sensor?
Yes. NGK 22101 is a heated sensor of the switching zirconia type.
Is this O2 sensor tested for vibration and heat?
Yes. Development includes vibration and thermal shock testing, and the sensor is also tested during manufacturing.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
