Keep your engine's air-fuel feedback loop reading accurately with the NTK Oxygen Sensor-Direct Fit (P/N 25739). An oxygen sensor sits in the exhaust stream and measures the oxygen content of the exhaust gases, then sends that signal to the engine control unit so it can trim the air-fuel ratio. As a direct-fit sensor, it carries the matching connector so it plugs into the harness and installs without splicing or wiring modification. Confirm the correct application in the Buyer's Guide tab before ordering.
- Measures exhaust oxygen: reports the oxygen content of the exhaust to the ECU for closed-loop air-fuel control.
- Direct-fit design: uses the OE-style connector to plug into the factory harness without cutting or adapting wiring.
- Feedback for the fuel system: supplies the signal the ECU uses to keep the mixture within its intended range.
Signs the original oxygen sensor may need replacing include an illuminated check engine light, higher-than-normal fuel consumption, rough or uneven idle, or a failed emissions test. These symptoms can have other causes, so diagnose the fault before replacing; if a failed oxygen sensor is the cause, this sensor replaces it.
Interchange: Manufacturer part number 25739.
Frequently Asked Questions
What does this oxygen sensor do?
It measures the oxygen content of the exhaust gases and sends that signal to the engine control unit, which uses it to adjust the air-fuel ratio during closed-loop operation.
What does "Direct Fit" mean?
A direct-fit sensor comes with the matching OE-style connector, so it plugs into the factory harness and installs without splicing or modifying the wiring.
How do I know if my oxygen sensor is failing?
Common signs include a check engine light, increased fuel consumption, rough idle, or a failed emissions test. These can have other causes, so diagnose the fault before replacing.
Will this sensor fit my vehicle?
Please confirm the application in the Buyer's Guide tab before ordering, using your vehicle's year, make, model, and engine.
What is the manufacturer part number?
This is an NTK oxygen sensor, manufacturer part number 25739.
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