Oxygen Sensor for 2014-2018 Mazda 3 & More - DENSO 234-4939

$108.99
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DENSO Auto Parts Oxygen Sensor 234-4939
DENSO Auto Parts Oxygen Sensor 234-4939

Vehicles this part fits
    Part number: 234-4939
    UPC: 042511121904
    Condition: New
    Weight: 0.39 LBS
    Item Package Quantity: 1
    $108.99

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    DENSO Auto Parts Oxygen Sensor P/N:234-4939
    DENSO Auto Parts Oxygen Sensor P/N:234-4939
    $108.99
    $108.99

    DENSO 234-4939 oxygen sensor for the 2014-2018 Mazda 3 4-cylinder 2.0L or 2.5L and other vehicles measures the oxygen left in the exhaust and passes that reading to the engine computer. This is a downstream, heated narrow-band sensor with a direct-fit design.

    • Laser-welded stainless housing resists corrosion
    • PTFE filter blocks contaminants under harsh engine conditions
    • Dual-layer protection shields the ceramic element for fast, reliable response times
    • Aluminum oxide trap layer protects the ceramic element from silicone and lead poisoning

    Quick facts

    • Part: DENSO 234-4939 oxygen sensor
    • Fits: 2014-2018 Mazda 3 4-cylinder 2.0L or 2.5L and other vehicles
    • Position: Downstream
    • Condition: New

    A worn oxygen sensor can show up as a check engine light, a rough idle or lower fuel economy. Before you replace the sensor, rule out an exhaust leak, damaged wiring or another emissions fault, since any of them could be behind those symptoms.

    Fits

    This direct-fit downstream sensor is also an oxygen sensor for the 2014-2021 Mazda 6 4-cylinder 2.5L and fits the 2014-2018 Mazda 3 Sport 4-cylinder 2.0L or 2.5L. This listing is one sensor, and the 2014-2018 Mazda 3 4-cylinder 2.0L or 2.5L takes one.

    Specifications

    Fit and size

    • Position: Downstream
    • Quantity per vehicle: 1
    • Wires: 4
    • Wiring harness length: 26.77 in

    Build and materials

    • Sensor type: Narrow-band, heated
    • Condition: New
    • Country of origin: United States

    Product information is for general reference and may contain errors. See our Disclaimer.

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

    PE121886Z, 24792, 250-241074, 350-34693

    Frequently Asked Questions

    Does the DENSO 234-4939 fit the 2014-2018 Mazda 3 Sport 4-cylinder 2.0L or 2.5L?

    Yes. The DENSO 234-4939 downstream oxygen sensor fits the 2014-2018 Mazda 3 Sport with either the 4-cylinder 2.0L or the 4-cylinder 2.5L engine.

    Is the DENSO 234-4939 an upstream or downstream oxygen sensor?

    The DENSO 234-4939 is a downstream sensor. This listing is a single sensor, and the application takes one.

    How many wires does this heated oxygen sensor have?

    This DENSO sensor has 4 wires and a 26.77 inch wiring harness. It is a heated narrow-band design made for a specific fit, not a universal one.

    What keeps contaminants away from the ceramic element in this DENSO sensor?

    A PTFE filter blocks contaminants, and a dual-layer shield protects the ceramic element. An aluminum oxide trap layer guards it against silicone and lead poisoning.

    What can a failing downstream oxygen sensor do to how a car runs?

    A failing downstream oxygen sensor can trigger a check engine light, a rough idle or lower fuel economy. A shop can read the stored codes and test the sensor for you.

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