1.BMW X1 Series O2 Sensor

OEM Part Number:
upstream(Front) Oxygen Sensor part No.: 11787591541 (for 1.5T/2.0T engine)
Downstream(Rear) Oxygen Sensor part No.: 11787591542
Defender Oxygen Sensor Fault Codes & Symptom Signs
P0130: Front Oxygen Sensor Circuit Voltage Abnormality (Wiring Aging or Sensor Carbon Buildup)
P0420: Catalytic converter inefficiency (Rear Oxygen Sensor signal deviation or 3-way catalytic converter failure)
What causes & How to repair
Short-distance driving in the city leads to carbon buildup and delayed sensor response; mud and water erode the sensor interface after off-road driving.
How much oxygen sensor cost to replace ?
Genuine sensor: 300-500 (labor cost 100-150)
Sub-factory parts (e.g. Bosch): 150-250

2.BMW X3 Series O2 Sensor

OEM part number:
upstream(Front) Oxygen Sensor part No.: 11787591543 (for B48/B58 engine)
Downstream(Rear) Oxygen Sensor part No.: 11787591544
Defender Oxygen Sensor Fault Codes & Symptom Signs
P2195: Front Oxygen Sensor Signal Fixed High Voltage (Poor Fuel Quality or Clogged Injector)
P2270: Rear Oxygen Sensor Signal Sticky (Heating Circuit Fault or Sensor Poisoning)
What causes & How to repair
Overheating of turbocharging system after long-distance driving under high load, triggering signal drift; delayed heating of sensor due to low temperature in cold areas
How much oxygen sensor cost to replace ?
OEM sensor: 400-600 (labor cost 150-200)
Sub-factory parts (e.g. NGK): 200-350

3.BMW X5/X7 series O2 Sensor

Genuine part number:
X5upstream(Front) Oxygen Sensor part No.: 11787654321 (for 3.0T B58 engine)
X7Downstream(Rear) Oxygen Sensor part No.: 11787654322 (for 4.4T V8 engine)
Defender Oxygen Sensor Fault Codes & Symptom Signs
P0030/P0050: Oxygen Sensor Heating Circuit Fault (shorted wiring harness or abnormal ECU power supply)
P2096: Rear Oxygen Sensor Signal Too Dilute (Exhaust Leak or Insufficient Fuel Pressure)
What causes & How to repair
When towing heavy loads, the engine continues to run at high loads, accelerating the aging of the sensor; luxury models with complex electronic systems are susceptible to electromagnetic interference.
How much oxygen sensor cost to replace ?
X5 OEM sensor: 500-800 (labor cost 200-300)
X7 original sensor: 600-1,000 (labor cost 250-400)

4.BMW 2 Series/3 Series/4 Series O2 Sensor

Original part number:
2-Series (B48 engine): 11787591545
3 Series upstream(Front) Oxygen Sensor part No.: 11787654323 (G20/G21 platform)
4 Series Downstream(Rear) Oxygen Sensor part No.: 11787654324
Defender Oxygen Sensor Fault Codes & Symptom Signs
P0134: Front Oxygen Sensor No Signal (Broken Circuit or Oxidized Plug)
P2271: Rear Oxygen Sensor Signal Sticky & Low Voltage (Fuel Sulfur Poisoning)
What causes & How to repair
Sport driving mode mixture is rich, acceleration sensor carbon accumulation; modified exhaust system causes sensor false alarms
How much oxygen sensor cost to replace ?
Genuine sensor: 250-450 (labor cost 80-150)
Sub-factory parts: 120-300

5.BMW 5 series/7 series O2 Sensor

Genuine part number:
5 Series upstream(Front) Oxygen Sensor part No.: 11787654325 (B58 engine)
7 Series Downstream(Rear) Oxygen Sensor part No.: 11787654326 (N63 V8 engine)
Defender Oxygen Sensor Fault Codes & Symptom Signs
002AC2: DME Exhaust Gas Catalyst Pre-Oxygen Sensor Confidence Fault (Signal Drift or Software Matching Issue)
P2297: Fuel Pressure & Oxygen Sensor Signal Contradiction (High Pressure Pump or Low Pressure Sensor Failure)
What causes & How to repair
High-temperature sintering of three-way catalytic converter after long-distance driving in business, which leads to oxygen sensor failure; shortening of sensor life due to frequent starting and stopping of hybrid models.
How much oxygen sensor cost to replace ?
5-series original sensor: 350-600 (labor cost 150-250)
7-series OEM sensor: 700-1,200 (labor cost 300-500)
General Repair Recommendations
Troubleshooting priority:
Check wiring harness and plugs first (40% of failures), then clean or replace sensors
Use ISTA diagnostic tool to calibrate signals to avoid misjudgment (especially for luxury models such as 7 Series)
Parts selection:
OEM parts fit best, but Bosch/NGK subcomponents are cost-effective (compatibility subject to VIN verification)
Cost Optimization:
Purchasing sensors on your own and then commissioning third-party repairs can save 30%-50% on labor costs
Data sources and operational recommendations
Part Number Verification: Get the exact OE code through BMW ETK system or dealer VIN decoder
Real-time quotes: refer to RepairPal or local 4S stores, prices fluctuate greatly depending on the region and supply chain.
Fault Code Expansion: Full fault library available in BMW TIS technical documentation (subscription required)

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