Amrxuts Oxygen Sensor Set for Subaru & Saab — 2-piece Upstream/Downstream 2.5L H4, OE-fit Tested

Amrxuts 2-piece upstream and downstream oxygen sensor set replaces worn sensors on compatible Subaru and Saab 2.5L H4 models to help restore accurate air-fuel sensing and normal emissions-system operation.

This aftermarket pair includes both the upstream (front) and downstream (rear) O2 sensors built to match OE fitment for select Subaru Impreza, Legacy, Forester, Outback and Saab 9-2X vehicles from the 2006–2011 model years. Each sensor is new, bench-tested before shipping, and supplied with pre-attached wiring harnesses sized to the original routing so installation is straightforward for experienced DIYers or technicians.

Will these sensors fit my Subaru or Saab?

They are designed for the 2.5L H4 engine variants listed by model and year. Confirm vehicle compatibility using the part numbers, engine code, and model year before purchase to avoid returns.

• Compatible models: Subaru Impreza (2006–2011), Legacy (2006–2009), Forester (2006–2010), Outback (2006–2009)
• Also fits Saab 9-2X with 2.5L H4 (model years noted)
• Cross-reference part numbers: 234-9123, 22641-AA36A (upstream); 234-4445, 22690-AA810 (downstream)

How do these sensors arrive and what are the key specifications?

The pair ships new from Amrxuts and each sensor has factory-tested electrical continuity. Physical and electrical specs are matched to OE items for plug-and-play replacement in original harness locations.

• Includes: 2 sensors — upstream (234-9123) and downstream (234-4445)
• Wire harness lengths: upstream 19.69 inches; downstream 20.87 inches
• Wire quantity: 4 wires per sensor to match vehicle connectors
• Condition: aftermarket, 100% tested before shipment

What should I expect during installation and early operation?

Installation is intended to be a direct-fit swap using existing mounting points and connectors. After installation, engine control units typically relearn sensor behavior; a short drive cycle may be needed for normal closed-loop operation.

• Direct-fit design reduces modification and connector splicing
• Use anti-seize on threads if not pre-applied and torque to factory spec
• Clear any stored error codes after replacement and perform a drive cycle
• If check-engine light persists, verify wiring and connector seating

Who is this for: this Amrxuts sensor kit is aimed at owners and mechanics replacing failing oxygen sensors on the listed Subaru and Saab 2.5L H4 vehicles who need an affordable, tested aftermarket replacement. It’s suitable for workshop technicians and competent DIYers comfortable with undercar or engine-bay work, OBD-II code clearing, and basic torque procedures. If you need exact OEM part matching, cross-check the part numbers provided before buying.