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Upstream Air Fuel Ratio Sensor (5-Wire)
Fits Subaru Forester & WRX
Replaces OE: 234-5178, 22641AA650
Resolves Symptoms
- Check Engine Light (P0420/P0171)
- Rough Idle & Hesitation
- Poor Fuel Economy (MPG)
- Failed Emissions Inspection
Estimated Delivery
Free
Ordered
Oct 8
Prepared
Oct 8-Oct 9
Delivered
Oct 10-Oct 13
Dispatched quickly from local US warehouses.
2-Year Warranty
🛡️ Quality Coverage: Protects against any manufacturing defects for 2 full years.
🔄 Free Replacement: Brand-new replacement for free if quality issues occur.
30-Day Return & Refund
📦 Free Returns: Zero costs to you if the product has quality issues.
💰 Full Refunds: 100% money-back guarantee within 30 days for defective items.
5-Step Fitment Guide
- Check OE: Find original part no. & plug.
- Compare Photos: Match plug with our images.
- Verify YMM: Confirm via fitment tool.
- Review Specs: Check pins & dimensions.
- Purchase: Buy confidently once matched!
Review Rewards
Share an install photo & review to unlock:
- Under $50 Orders: 3% Off Next Order
- $50+ Orders: 5% Direct Cashback
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$59.95
-
No hidden fees: What you see is what you pay.
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Restore performance: Fix issues and drive with confidence.
Check Engine Light? Find Your Symptoms
🌬️ O2 & A/F Sensors
- P0134No Activity Detected
- P0135Heater Circuit Malfunction
- P0137/38Circuit Low/High Voltage
- P2195Signal Stuck Lean
- P0030/31Heater Control Circuit
⛽ Fuel & Air Mixture
- P0171/74System Too Lean
- P0172System Too Rich
- P2096Post-Catalyst Trim Too Lean
- P0087Fuel Rail Pressure Low
- P0201-04Injector Circuit Open
♻️ Catalytic Converters
- P0420Efficiency Below Threshold (B1)
- P0430Efficiency Below Threshold (B2)
⚡ Ignition / Misfires
- P0300Random Misfire
- P0301-06Cylinder-Specific Misfire
Automotive-Leader Sensors
Vehicle Compatible
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Year
|
Make
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Model
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Engine/Displacement
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|---|---|---|---|
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2014-2017
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Subaru
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Forester
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2.0L H4
|
|
2015-2017
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Subaru
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WRX
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2.0L H4
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Product Specifications
Warranty & Support: 2-Year Warranty (Pre-sale Load Test + 24/7 Technical Support)
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Item
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Specification
|
|---|---|
|
Core Part Number
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234-5178
Interchange: 2345178, 234 5178, 22641-AA650, 22641AA650, 22641 AA650 |
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Position
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Upstream, Pre-Catalytic Converter
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Key Parameters
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- Type: Heated Wideband Air-Fuel Ratio Sensor (5-Wire)
- Wire Harness Length: 282 mm (11.10 in) - Connector Gender: Female - Thread Size: M18×1.5 (0.708 in / 17.98mm) |
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Key Features
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Improves fuel efficiency, stable performance, durable.
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