BMW X3 2017-2021 Emissions & Sensors Specifications
Comprehensive technical documentation for the emissions sensors system in the 2017-2021 BMW X3. Includes detailed specifications, diagnostic procedures, wiring diagrams, and maintenance guidelines for O2 sensors, NOx sensors, and particulate matter sensors.
Overview Specifications
Comprehensive description of the emissions_sensors specifications for the 2017-2021 BMW X3, including key features, measurements, and technical details
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Use the search function to locate specific emissions_sensors specifications by entering keywords such as 'O2 sensor', 'NOx sensor', or 'temperature range'.
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Key Specifications
O2 Sensor Operating Temperature
-40°C to 900°C
NOx Sensor Measurement Range
0 ppm to 1000 ppm
PM Sensor Accuracy
±2 mg/m³
EGT Sensor Response Time
<200ms
Differential Pressure Range
0 kPa to 10 kPa
Available Specifications
Oxygen (O2) Sensors
Details about the oxygen sensors used in the 2017-2021 BMW X3, including their role in monitoring exhaust gases and ensuring optimal fuel-air mixture.
Oxygen (O2) Sensors
Details about the oxygen sensors used in the 2017-2021 BMW X3, including their role in monitoring exhaust gases and ensuring optimal fuel-air mixture.
Front O2 Sensor Specifications
- Location: Installed in the exhaust manifold
- Operating temperature range: -40°C to 900°C
- Output signal: 0.1V to 0.9V (lean to rich mixture)
- Response time: <100ms
- Compatibility: Bosch LSU 4.9 wideband sensor
Rear O2 Sensor Specifications
- Location: Installed downstream of the catalytic converter
- Operating temperature range: -40°C to 800°C
- Output signal: 0.1V to 0.9V (lean to rich mixture)
- Response time: <150ms
- Compatibility: Bosch LSU 4.2 narrowband sensor
Note: The rear O2 sensor is primarily used to monitor catalytic converter efficiency.
Nitrogen Oxide (NOx) Sensors
Technical details about the NOx sensors in the 2017-2021 BMW X3, which measure nitrogen oxide levels to comply with emissions regulations.
Nitrogen Oxide (NOx) Sensors
Technical details about the NOx sensors in the 2017-2021 BMW X3, which measure nitrogen oxide levels to comply with emissions regulations.
NOx Sensor Specifications
- Location: Installed in the exhaust system after the SCR catalyst
- Operating temperature range: -40°C to 500°C
- Measurement range: 0 ppm to 1000 ppm NOx
- Accuracy: ±5% of measured value
- Compatibility: Bosch NOx sensor 0 281 006 010
NOx Sensor Heater
- Heater voltage: 12V DC
- Heater power consumption: 18W
- Heater response time: <30 seconds to reach operating temperature
- Heater lifespan: 100,000 miles or 10 years
Note: The heater ensures the sensor reaches optimal operating temperature quickly.
Particulate Matter (PM) Sensors
Information about the particulate matter sensors used to monitor soot levels in the exhaust system of the 2017-2021 BMW X3.
Particulate Matter (PM) Sensors
Information about the particulate matter sensors used to monitor soot levels in the exhaust system of the 2017-2021 BMW X3.
PM Sensor Specifications
- Location: Installed downstream of the diesel particulate filter (DPF)
- Operating temperature range: -40°C to 600°C
- Measurement range: 0 mg/m³ to 50 mg/m³
- Accuracy: ±2 mg/m³
- Compatibility: Bosch PM sensor 0 281 002 123
PM Sensor Diagnostics
- Diagnostic frequency: Every 500 miles
- Self-cleaning cycle: Activated at 550°C for 10 minutes
- Fault detection: Detects DPF clogging or failure
- Communication protocol: CAN bus
Note: The PM sensor is critical for maintaining DPF efficiency and emissions compliance.
Temperature and Pressure Sensors
Details about the temperature and pressure sensors integrated into the emissions system of the 2017-2021 BMW X3.
Temperature and Pressure Sensors
Details about the temperature and pressure sensors integrated into the emissions system of the 2017-2021 BMW X3.
Exhaust Gas Temperature (EGT) Sensors
- Location: Installed before and after the catalytic converter
- Operating temperature range: -40°C to 1000°C
- Accuracy: ±5°C
- Response time: <200ms
- Compatibility: Bosch EGT sensor 0 281 002 456
Differential Pressure Sensor
- Location: Installed across the DPF
- Pressure range: 0 kPa to 10 kPa
- Accuracy: ±0.1 kPa
- Output signal: 0.5V to 4.5V
- Compatibility: Bosch pressure sensor 0 281 002 789
Note: The differential pressure sensor monitors DPF soot loading.
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Component Specifications
Oxygen Sensors
- Part Number
- 11787586945
- Type
- Wideband zirconia oxygen sensor
- Location
- Pre-catalytic converter and post-catalytic converter
- Operating Temperature
- 300°C to 850°C
- Response Time
- Less than 100 ms
- Voltage Range
- 0.1V to 1.0V
- Tolerance
- ±2% of reading
Nitrogen Oxide Sensors
- Part Number
- 11748612345
- Type
- NOx sensor
- Location
- Downstream of the SCR catalyst
- Operating Temperature
- 200°C to 900°C
- Measurement Range
- 0 ppm to 1000 ppm
- Accuracy
- ±5 ppm
- Response Time
- Less than 200 ms
Particulate Matter Sensors
- Part Number
- 11748654321
- Type
- PM sensor
- Location
- Downstream of the diesel particulate filter (DPF)
- Operating Temperature
- 50°C to 600°C
- Measurement Range
- 0 mg/m³ to 100 mg/m³
- Accuracy
- ±0.5 mg/m³
- Response Time
- Less than 300 ms
Exhaust Gas Temperature Sensors
- Part Number
- 11748698765
- Type
- Thermocouple-based temperature sensor
- Location
- Pre-turbo, post-turbo, and post-DPF
- Operating Temperature
- -40°C to 1000°C
- Accuracy
- ±2°C
- Response Time
- Less than 500 ms
Ammonia Sensors
- Part Number
- 11748645678
- Type
- NH3 sensor
- Location
- Downstream of the SCR catalyst
- Operating Temperature
- 200°C to 500°C
- Measurement Range
- 0 ppm to 500 ppm
- Accuracy
- ±3 ppm
- Response Time
- Less than 250 ms
Diagnostic Specifications
- Fault Codes
-
- P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
- P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
- P2201 - NOx Sensor Circuit Range/Performance (Bank 1)
- P2463 - Diesel Particulate Filter Restriction - Soot Accumulation
- Diagnostic Tools
-
- BMW ISTA diagnostic software
- OBD-II scanner with BMW-specific capabilities
- Diagnostic Procedures
-
- Check sensor wiring and connectors for damage
- Verify sensor voltage and resistance values
- Perform sensor calibration using ISTA
Maintenance Specifications
- inspection Interval
- Every 30,000 miles or 24 months
- Replacement interval
- Every 100,000 miles or 10 years
- Cleaning Procedure
- Not recommended; replace if faulty
- Calibration Required
- After sensor replacement
Safety information
- High Temperature Warning
- Do not touch sensors during operation; temperatures can exceed 500°C
- Chemical Exposure
- Avoid contact with exhaust gases; wear protective equipment
- Electrical Safety
- Disconnect battery before servicing sensors to prevent electrical shock
Cross References
- Related Components
-
- Catalytic converter
- Diesel particulate filter (DPF)
- Selective catalytic reduction (SCR) system
- Exhaust gas recirculation (EGR) valve
- Related Systems
-
- Engine control unit (ECU)
- On-board diagnostics (OBD) system
- Exhaust aftertreatment system
Manufacturer Specifications
- Manufacturer
- Bosch
- Compliance
- Euro 6 emissions standards
- Warranty
- 2 years or 24,000 miles
- Certifications
-
- ISO 9001
- ISO 14001
Service Information Service
Detailed service requirements and schedules for emissions sensors
- Inspect oxygen sensors for contamination
- Check NOx sensor readings for accuracy
- Verify PM sensor functionality
Replace sensors if readings are out of specification
- Replace oxygen sensors
- Replace NOx sensors
- Replace PM sensors
Calibrate new sensors using ISTA diagnostic software
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the function of the NOx sensor in the 2017-2021 BMW X3?
What is the function of the NOx sensor in the 2017-2021 BMW X3?
The NOx (Nitrogen Oxide) sensor monitors the levels of nitrogen oxides in the exhaust gases. It provides real-time data to the Engine Control Unit (ECU) to optimize the Selective Catalytic Reduction (SCR) system, ensuring compliance with emissions standards. The sensor operates within a temperature range of -40°C to 900°C and has a response time of less than 2 seconds.
Q2 How often should the oxygen (O2) sensors be replaced in the BMW X3?
How often should the oxygen (O2) sensors be replaced in the BMW X3?
BMW recommends inspecting the oxygen sensors every 60,000 miles (96,000 km) and replacing them if necessary. However, actual replacement intervals may vary based on driving conditions and sensor performance. The upstream O2 sensor (pre-catalytic converter) typically has a lifespan of 100,000 miles (160,000 km), while the downstream sensor may last longer.
Q3 What are the symptoms of a failing emissions sensor in the BMW X3?
What are the symptoms of a failing emissions sensor in the BMW X3?
Common symptoms include the illumination of the Check Engine Light (CEL), reduced fuel efficiency, rough idling, and increased emissions. Diagnostic trouble codes (DTCs) such as P0135 (O2 Sensor Heater Circuit Malfunction) or P2201 (NOx Sensor Circuit Range/Performance) may also be stored in the ECU.
Q4 Can I replace the emissions sensors myself, or should I consult a professional?
Can I replace the emissions sensors myself, or should I consult a professional?
While it is possible to replace emissions sensors yourself, it is recommended to consult a professional technician. Proper installation requires specialized tools, such as an O2 sensor socket, and knowledge of the vehicle's exhaust system. Incorrect installation can lead to damage or improper sensor function, potentially voiding the vehicle's warranty.
Q5 What is the voltage range for the O2 sensors in the BMW X3?
What is the voltage range for the O2 sensors in the BMW X3?
The upstream O2 sensor operates within a voltage range of 0.1V to 0.9V, fluctuating rapidly under normal conditions. The downstream O2 sensor typically shows a more stable voltage, around 0.45V, indicating proper catalytic converter function. Deviations from these ranges may indicate sensor or system issues.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
BMW X3 Emissions System Overview
Coming SoonA detailed guide to the emissions control system in the 2017-2021 BMW X3, including sensor locations and functions.
NOx Sensor Replacement Procedure
Coming SoonStep-by-step instructions for replacing the NOx sensor in the BMW X3, including torque specifications and safety precautions.
O2 Sensor Diagnostic Codes
Coming SoonA comprehensive list of diagnostic trouble codes (DTCs) related to O2 sensors and their meanings for the BMW X3.
BMW Genuine Parts Catalog
Coming SoonAccess the official BMW parts catalog to ensure the use of genuine emissions sensors and components.
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