FITMENT:
Compatible with BMW petrol vehicles equipped with N43 engine and NOx emissions system, including:

• BMW 1 Series: E81 / E87 / E87 LCI / E82 / E88
• BMW 3 Series: E90 / E91 / E92 / E93 (including LCI models)
• Engine codes: N43 (116i / 118i / 120i / 318i / 320i petrol engines)

OEM / Cross reference numbers:

• 758713003
• 5WK96621H / 5WK9 6621H
• 11787587130 / 758713005 / 5WK96621J / 5WK96621K (related variants)

This is a petrol NOx sensor used in BMW N43 engine emissions system, designed to monitor nitrogen oxide levels in exhaust gases and optimize combustion and emissions control.

FUNCTION:

• Measures NOx concentration in exhaust gas stream
• Sends signal to ECU for fuel-air mixture control
• Supports catalytic converter efficiency monitoring
• Helps reduce emissions and improve engine performance

INSTALLATION POSITION:

• Exhaust system near catalytic converter
• Typically downstream sensor in N43 engine NOx monitoring system

IMPORTANT NOTE:
BMW NOx sensors for N43 engines are very sensitive to calibration differences. Even if part numbers look similar, correct OEM matching is essential to avoid:

• Engine warning lights
• Poor fuel economy
• Fault codes (NOx efficiency / catalyst errors)

FAQ:

Q1: Is this diesel SCR sensor?
A1: No. This is a petrol engine NOx sensor for BMW N43, not a diesel AdBlue/SCR sensor.

Q2: What are symptoms of failure?
A2: Engine light, increased fuel consumption, limp mode, NOx/catalyst fault codes.

Q3: Are 5WK96621H and 758713003 the same?
A3: Yes. 5WK96621H is the Continental manufacturer reference for BMW OEM 758713003.

Q4: Can I use aftermarket versions?
A4: Many aftermarket sensors may cause incorrect readings—OEM or high-quality equivalents are recommended.

Q5: Does it require programming after installation?
A5: Some BMW models require NOx adaptation/reset via diagnostic tool (ISTA).