NTK
NTK Oxygen Sensor 21039
NTK Oxygen Sensor 21039
Part number: 3P9OJ
Regular price
$43.69 USD
Regular price
Sale price
$43.69 USD
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- Ships direct from the brand or supplier
- Tracking emailed when it ships
- Free fitment check before you order
Oxygen Sensor 21039 by NTK. Check the part number and details below against what you are replacing. Sensors tell the engine computer what is happening so it can adjust fuel, timing and gauges.
Quick facts
- Brand: NTK
- Part type: Sensor
Listed fitment
- 1999 Chevrolet Cavalier LS, Z24, Base, RS
- 1999 Chevrolet Malibu LS, Base
- 1999 - 2000 Chevrolet S10 Xtreme, ZR2, Base, LS
- 1999 - 2000 GMC Sonoma SLS, SLE, SL
- 1999 - 2000 Isuzu Hombre S, XS
- 1999 Oldsmobile Alero GLS, GL, GX
- 1999 Pontiac Grand Am SE, GT
- 1999 Pontiac Sunfire GT, SE, Base
- 1995 - 2002 Saturn SC1 Base
- 1995 - 2002 Saturn SC2 Base
- 1995 - 2002 Saturn SL Base
- 1995 - 2002 Saturn SL1 Base
- 1995 - 2002 Saturn SL2 Base
- 1995 - 1999 Saturn SW1 Base
- 1995 - 2001 Saturn SW2 Base
Tip: Read the code, check the wiring and connector, and clear codes after the new sensor is in.
NTK sensor: what to know
A failed sensor usually sets a check-engine code and can cause poor running or wrong readings.
Fitment notes
- Specs, lead time and warranty come from NTK and can change. The details above this guide are the latest we have.
Not sure it fits? Send us your year, make, model, engine and trim and we'll check before you order.
Ask about fitmentWhat else to plan for
- Connector and wiring. Corroded connectors mimic a bad sensor.
More for your car: Oxygen (O2) Sensors · Batteries & electrical
Questions about sensor
Will this fit my car?
Check the title and details above for the vehicles and part number it is listed for. If you are not sure, contact us with your year, make, model, engine and trim and we will confirm fitment before you order.
Will a new sensor clear my check-engine light?
If the sensor was the cause, the light usually goes off after codes are cleared or after a few drive cycles.
Where do specs and warranty details come from?
From NTK. Each brand sets its own specs, lead times and warranty terms, and they can change. The product details above are the latest we have.
Questions & answers
No questions yet about this part. Ask about fitment, what's in the box or installation and we'll answer here.
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