Delphi ES10439 oxygen sensor for the 1995-1998 Subaru Legacy H4 2.2L, the 1996-1998 Legacy H4 2.5L and other vehicles measures the oxygen in the exhaust and reports it to the engine computer. The computer uses that reading to adjust fuel delivery.
- Delphi planar technology covers older conical-design sensors
- Smart design consolidates SKUs without using long wires
- Patented protective sensor coating helps prevent contamination
- Validated for all fuel types, including ethanol blends like E85
- Tested to 150,000 miles, plus 2,000 hours of severe thermal testing
Quick facts
- Part: Delphi ES10439 oxygen sensor
- Fits: 1995-1998 Subaru Legacy H4 2.2L, the 1996-1998 Legacy H4 2.5L and other vehicles
- Position: Front, Rear
- Condition: New
A check-engine light, worse fuel economy or rough running can be signs of a worn oxygen sensor, but each has other possible causes. With the engine off and cool, look over the sensor wiring and connector for damage, and find the actual cause of the symptom before you buy a sensor.
Fits
This Delphi oxygen sensor also fits the 1995-1997 Subaru Impreza H4 2.2L and the 1996-1997 Impreza H4 1.8L. The 1995-1997 Impreza H4 2.2L, the 1996-1997 Impreza H4 1.8L and the 1995 Legacy H4 2.2L take two sensors, while the 1996-1998 Legacy H4 2.5L and H4 2.2L take one. This listing is a single sensor.
Specifications
Fit and size
- Position: Front, Rear
- Quantity per vehicle: 1 or 2, depending on the car and engine
- Sold as: one sensor per listing
Build and materials
- Technology: Delphi planar
- Coating: patented protective sensor coating
- Fuel types: validated for all fuel types, including ethanol blends like E85
- Condition: New
In the box
One oxygen sensor and one instruction sheet.
Interchange: 156-3022 · 234-3088 · 138-359 · 250-23088
22690 AA220 · 22690 AA220F · 2131277 · 2131280 · OS855 · 13445 · 24520 · REA1077 · SG176 · SU4687
This part cross-references / interchanges with the following part numbers:
2131277, 2131280, 156-3022, OS855, 13445, 234-3088, 138-359, 24520, REA1077, SG176, 22690 AA220, 22690 AA220F, 250-23088, SU4687
Frequently Asked Questions
Is the Delphi ES10439 an oxygen sensor for the 1996-1997 Subaru Impreza H4 1.8L?
Yes. Delphi ES10439 is listed for the 1996-1997 Subaru Impreza H4 1.8L, and that engine takes two sensors.
What is in the Delphi ES10439 package besides the sensor?
The package holds the oxygen sensor and an instruction sheet.
Are Delphi O2 sensors like the ES10439 validated for ethanol blends?
Yes. Delphi ES10439 is validated for every fuel type, E85 and other ethanol blends included.
How can I tell if an oxygen sensor like the ES10439 is going bad?
A check-engine light, worse fuel economy or rough running can be signs of a worn sensor. A shop can read the codes and test the sensor to confirm.
Is OS855 an interchange number for the Delphi ES10439?
Yes. OS855 is on the Interchange line for Delphi ES10439, along with numbers such as 156-3022 and 13445.
