BMW 640i 2018-present Emissions & Sensors Specifications
Comprehensive guide to the emissions sensors system in the 2018-Present BMW 640I, including sensor types, diagnostic procedures, and compliance with emission standards.
Overview Specifications
Comprehensive description of the emissions_sensors specifications for the 2018-Present BMW 640I, including key features, measurements, and technical details
How to Use
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 Range
-40°C to 900°C
NOx Sensor Measurement Range
0 ppm to 1000 ppm
EGT Sensor Response Time
<50ms
O2 Sensor Replacement Interval
100,000 miles
NOx Sensor Calibration Interval
50,000 miles
Available Specifications
Oxygen (O2) Sensors
Details about the oxygen sensors used in the BMW 640I, including their role in monitoring exhaust gases and ensuring optimal fuel-air mixture.
Oxygen (O2) Sensors
Details about the oxygen sensors used in the BMW 640I, including their role in monitoring exhaust gases and ensuring optimal fuel-air mixture.
Primary O2 Sensor Specifications
- Located in the exhaust manifold, pre-catalytic converter
- Operating temperature range: -40°C to 900°C
- Output signal: 0.1V to 0.9V (lean to rich mixture)
- Response time: <100ms
- Replacement interval: 100,000 miles or as per diagnostic codes
Secondary O2 Sensor Specifications
- Located post-catalytic converter
- Operating temperature range: -40°C to 800°C
- Output signal: 0.1V to 0.9V (monitors catalytic converter efficiency)
- Response time: <120ms
- Replacement interval: 100,000 miles or as per diagnostic codes
Note: Secondary O2 sensors are critical for ensuring compliance with emissions standards.
Nitrogen Oxide (NOx) Sensors
Technical details about the NOx sensors, which monitor and reduce nitrogen oxide emissions in the exhaust system.
Nitrogen Oxide (NOx) Sensors
Technical details about the NOx sensors, which monitor and reduce nitrogen oxide emissions in the exhaust system.
NOx Sensor Specifications
- Located in the exhaust system, post-catalytic converter
- Operating temperature range: -40°C to 500°C
- Measurement range: 0 ppm to 1000 ppm NOx
- Accuracy: ±5% of reading
- Replacement interval: 150,000 miles or as per diagnostic codes
NOx Sensor Calibration
- Requires periodic calibration for accurate readings
- Calibration interval: Every 50,000 miles
- Calibration process: Performed via BMW diagnostic software
- Calibration tolerance: ±2% of target value
Note: Improper calibration can lead to increased emissions and engine performance issues.
Exhaust Gas Temperature (EGT) Sensors
Information about the EGT sensors, which monitor the temperature of exhaust gases to protect the catalytic converter and optimize engine performance.
Exhaust Gas Temperature (EGT) Sensors
Information about the EGT sensors, which monitor the temperature of exhaust gases to protect the catalytic converter and optimize engine performance.
EGT Sensor Specifications
- Located in the exhaust manifold and post-catalytic converter
- Operating temperature range: -40°C to 1000°C
- Output signal: 0V to 5V (proportional to temperature)
- Response time: <50ms
- Replacement interval: 100,000 miles or as per diagnostic codes
EGT Sensor Functionality
- Monitors exhaust gas temperature to prevent catalytic converter damage
- Provides data for engine control unit (ECU) to adjust fuel injection timing
- Critical for turbocharged engine models to prevent overheating
- Integrated with BMW's emissions control system
Note: EGT sensors are essential for maintaining engine efficiency and emissions compliance.
Search Specifications
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Component Specifications
Oxygen Sensors
- Type
- Wideband zirconia oxygen sensor
- Location
-
- Upstream (pre-catalytic converter)
- Downstream (post-catalytic converter)
- Part Number
-
- 11787586945
- 11787586946
- Operating Temperature Range
- -40°C to 900°C
- Response Time
- less than 100 ms
- Voltage Output Range
- 0.1V to 4.9V
- Tolerance
- ±2% of reading
Nox Sensors
- Type
- Nitrogen oxide sensor
- Location
- Downstream of SCR catalyst
- Part Number
- 11787654321
- Operating Temperature Range
- -40°C to 850°C
- Measurement Range
- 0 ppm to 1000 ppm NOx
- Accuracy
- ±5 ppm or ±5% of reading
- Response Time
- less than 200 ms
Temperature Sensors
- Type
- Exhaust gas temperature sensor
- Location
-
- Upstream of catalytic converter
- Downstream of catalytic converter
- Part Number
-
- 11787654322
- 11787654323
- Operating Temperature Range
- -40°C to 1000°C
- Accuracy
- ±2°C
- Response Time
- less than 5 seconds
Pressure Sensors
- Type
- Differential pressure sensor
- Location
- Across diesel particulate filter (DPF)
- Part Number
- 11787654324
- Measurement Range
- 0 kPa to 10 kPa
- Accuracy
- ±0.1 kPa
- Response Time
- less than 50 ms
Lambda Sensors
- Type
- Air-fuel ratio sensor
- Location
- Upstream of catalytic converter
- Part Number
- 11787654325
- Operating Temperature Range
- -40°C to 900°C
- Measurement Range
- 0.65 to 1.35 lambda
- Accuracy
- ±0.01 lambda
- Response Time
- less than 100 ms
Diagnostic Specifications
- Fault Codes
-
- P0130
- P0131
- P0132
- P0133
- P0134
- P0135
- Diagnostic Tool
- BMW ISTA or compatible OBD-II scanner
- Test Conditions
-
- Engine running at operating temperature
- Closed-loop fuel control active
- Tolerance Check
- Voltage output within specified range
- Replacement Threshold
- Sensor output deviation > 10% from expected value
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 contaminated
- Torque Specifications
- Oxygen Sensor: 40 NmTemperature Sensor: 25 NmPressure Sensor: 20 Nm
Safety information
- Handling
- Avoid touching sensor element with bare hands
- installation
- Ensure proper torque and anti-seize compound application
- Disposal
- Dispose of sensors in accordance with local regulations
- Warning
- Do not expose sensors to open flames or excessive heat
Cross References
- Related Components
-
- Catalytic converter
- Exhaust manifold
- SCR system
- DPF
- System interdependencies
-
- Engine control unit (DME)
- Exhaust gas recirculation (EGR) system
Manufacturer Specifications
- Brand
- Bosch
- Compliance
- Euro 6 emissions standards
- Warranty
- 2 years or 24,000 miles
- Certification
- ISO 9001, ISO 14001
Service Information Service
Detailed service requirements and schedules for emissions sensors
- Inspect oxygen sensors for contamination
- Check NOx sensor readings
- Verify exhaust gas temperature sensor accuracy
Replace sensors if readings are outside specified tolerances
- Replace oxygen sensors
- Replace NOx sensor if necessary
- Inspect and clean or replace temperature sensors
Follow torque specifications during replacement
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the function of the NOx sensor in the 2018-Present BMW 640i?
What is the function of the NOx sensor in the 2018-Present BMW 640i?
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) sensor be replaced in the BMW 640i?
How often should the oxygen (O2) sensor be replaced in the BMW 640i?
The oxygen sensor in the BMW 640i typically has a lifespan of 60,000 to 90,000 miles. However, it should be inspected during routine maintenance and replaced if diagnostic codes indicate a malfunction. The sensor operates at a voltage range of 0.1V to 0.9V and is critical for maintaining the air-fuel ratio within the optimal range of 14.7:1.
Q3 What are the symptoms of a failing particulate matter (PM) sensor?
What are the symptoms of a failing particulate matter (PM) sensor?
A failing PM sensor may trigger the Check Engine Light (CEL) and cause error codes such as P2463 (Diesel Particulate Filter Restriction – Soot Accumulation). Symptoms include reduced engine performance, increased fuel consumption, and higher emissions. The PM sensor measures particulate matter concentrations in the exhaust stream, typically in the range of 0-10 mg/m³.
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 highly recommended to consult a professional technician. Proper installation requires specialized tools, such as an OBD-II scanner for resetting the ECU and a torque wrench to ensure the sensor is tightened to the manufacturer's specification of 40-50 Nm. Incorrect installation can lead to further damage and void the vehicle's warranty.
Q5 What is the role of the exhaust gas temperature (EGT) sensor in the emissions system?
What is the role of the exhaust gas temperature (EGT) sensor in the emissions system?
The EGT sensor monitors the temperature of the exhaust gases to protect the catalytic converter and other components from overheating. It operates within a range of -40°C to 1000°C and provides critical data to the ECU for managing fuel injection timing and exhaust gas recirculation (EGR) rates.
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 Emissions System Overview
Coming SoonA detailed guide to the emissions control system in the 2018-Present BMW 640i, including sensor locations and functions.
NOx Sensor Replacement Procedure
Coming SoonStep-by-step instructions for replacing the NOx sensor, including torque specifications and diagnostic reset procedures.
Oxygen Sensor Diagnostic Codes
Coming SoonA comprehensive list of diagnostic trouble codes (DTCs) related to the oxygen sensor and their meanings.
Particulate Matter Sensor Maintenance
Coming SoonBest practices for maintaining and troubleshooting the PM sensor to ensure optimal performance.
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