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Important: Verify connector shape and pins match your original part.
Upstream O2 Sensor for BMW E46 E39 325i 525i X3 Z3 (1997-2005) | 234-4672
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  • Upstream O2 Sensor for BMW E46 E39 325i 525i X3 Z3 (1997-2005) | 234-4672
  • Upstream O2 Sensor for BMW E46 E39 325i 525i X3 Z3 (1997-2005) | 234-4672
  • Upstream O2 Sensor for BMW E46 E39 325i 525i X3 Z3 (1997-2005) | 234-4672
  • Upstream O2 Sensor for BMW E46 E39 325i 525i X3 Z3 (1997-2005) | 234-4672
  • Upstream O2 Sensor for BMW E46 E39 325i 525i X3 Z3 (1997-2005) | 234-4672
  • Upstream O2 Sensor for BMW E46 E39 325i 525i X3 Z3 (1997-2005) | 234-4672
  • Upstream O2 Sensor for BMW E46 E39 325i 525i X3 Z3 (1997-2005) | 234-4672
  • Upstream O2 Sensor for BMW E46 E39 325i 525i X3 Z3 (1997-2005) | 234-4672
  • Upstream O2 Sensor for BMW E46 E39 325i 525i X3 Z3 (1997-2005) | 234-4672

Upstream O2 Sensor

Fits BMW E46 E39 325i 525i X3 Z3 (1997-2005)
Replaces OE: 234-4672
Resolves Symptoms
  • Check Engine Light (P0420/P0171)
  • Rough Idle & Hesitation
  • Poor Fuel Economy (MPG)
  • Failed Emissions Inspection
Estimated Delivery Free
Ordered
Nov 12
Prepared
Nov 12-Nov 13
Delivered
Nov 26-Dec 4
Requires overseas shipment. Upgrade to expedited shipping at checkout if urgent.
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
+
  1. Check OE: Find original part no. & plug.
  2. Compare Photos: Match plug with our images.
  3. Verify YMM: Confirm via fitment tool.
  4. Review Specs: Check pins & dimensions.
  5. Purchase: Buy confidently once matched!
Review Rewards
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Share an install photo & review to unlock:

  • Under $50 Orders: 3% Off Next Order
  • $50+ Orders: 5% Direct Cashback

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List Price: $26.50
$24.95 $26.50
  • No hidden fees: What you see is what you pay.
  • Restore performance: Fix issues and drive with confidence.
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If problem with product: Free Returns & Refunds
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

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Out of stock in local warehouse
Requires shipment from overseas warehouse
Longer shipping time
Please do not place orders if this is a concern

Automotive-Leader Sensors

Vehicle Compatible

Year
Make
Model
Engine/Displacement
Sensor Location
1996-1999
BMW
318i
1.9L
Upstream
1996-1999
BMW
318is
1.9L
Upstream
1996-1999
BMW
318ti
1.9L
Upstream
2001-2005
BMW
320i
2.2L
Upstream
2000
BMW
323Ci
2.5L
Upstream
1999-2000
BMW
323i
2.5L
Upstream
2001-2003
BMW
325Ci
2.5L
Upstream
2001-2003
BMW
325i
2.5L
Upstream
2001-2005
BMW
325xi
2.5L
Upstream
1999-2000
BMW
328i
2.8L
Upstream
2000
BMW
328Ci
2.8L
Upstream
2001-2003
BMW
330i
3.0L
Upstream
2001-2005
BMW
330xi
3.0L
Upstream
2001-2003
BMW
330Ci
3.0L
Upstream
2001-2003
BMW
525i
2.5L
Upstream
1999-2000
BMW
528i
2.8L
Upstream
2001-2003
BMW
530i
3.0L
Upstream
1997-2003
BMW
540i
4.4L V8
Upstream
1997-2001
BMW
740i
4.4L V8
Upstream
1995-2001
BMW
750iL
5.4L V12
Upstream
1995-1997
BMW
850Ci
5.4L V12
Upstream
2004-2006
BMW
X3
2.5L / 3.0L
Upstream
2001-2006
BMW
X5
3.0L
Upstream
2000-2003
BMW
X5
4.4L V8
Upstream
2002-2003
BMW
X5
4.4L V8
Upstream
1999-2002
BMW
Z3
2.5L
Upstream
1999-2000
BMW
Z3
2.8L
Upstream
2001-2002
BMW
Z3
3.0L
Upstream
2003-2005
BMW
Z4
2.5L
Upstream
2003-2005
BMW
Z4
3.0L
Upstream
2003
BMW
Z8
4.8L V8
Upstream
2000-2003
BMW
Z8
5.0L V8
Upstream
2002-2003
BMW
M5
4.9L V8
Upstream
2000-2001
BMW
M5
5.0L V8
Upstream
2003-2005
Land Rover
Range Rover
4.4L V8
Upstream

 

Product Specifications

Warranty & Support: 2 Years + Pre-sale Load Test + 24/7 Technical Support
Item
Specification
Core Part Number
234-4672
Interchange: 2344672, 234 4672, 13477, 11781433075, 11781742050, 11787513962
Position
Exhaust System, Upstream (Pre-Catalytic Converter)
Key Parameters
- Type: Heated Oxygen Sensor (O2 Sensor)
- Wire Configuration: 4-Wire
- Connector Gender: Female
- Thread Diameter: 0.708 In. (approx. M18)
- Mounting Type: Threaded
- Wire Harness Length: 13.39 in

 

Package Content :

1Pcs 234-4672 Upstream Oxygen Sensor