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eBay£23.95Visit shop POST-CAT LAMBDA OXYGEN SENSOR FOR BMW E46 E39 E38 E83 E53 E36 E85 11781433940
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This high-quality aftermarket POST-CAT LAMBDA OXYGEN SENSOR is designed for BMW and Land Rover owners experiencing exhaust system performance issues or check engine lights related to emissions. Its key benefit is restoring optimal fuel efficiency and reducing harmful emissions by accurately monitoring exhaust gases post-catalytic converter. A caveat to consider is that professional installation by a qualified mechanic is required for the warranty to be valid.
| Model Part Number | 11781433940 |
|---|---|
| Brand | BMW |
This sensor monitors the amount of oxygen in the exhaust gas *after* the catalytic converter. This information helps the vehicle's computer regulate emissions and ensure the catalytic converter is functioning efficiently.
Professional installation ensures the sensor is fitted correctly and torque specifications are met, preventing damage and ensuring accurate readings. This is a standard requirement for many automotive parts to validate warranty claims.
Common signs include a Check Engine Light, reduced fuel efficiency, rough idling, and potentially failing emissions tests. The vehicle's diagnostic trouble codes (DTCs) will typically point to issues with the O2 sensor circuit or catalyst efficiency.
The lifespan of an oxygen sensor can vary depending on driving conditions and vehicle maintenance, but they typically last between 80,000 to 100,000 miles. A faulty sensor should be replaced promptly.
No, this sensor is specifically designed as a post-catalytic converter (post-cat) sensor. Using it in a pre-cat application may lead to incorrect readings and engine performance issues.
The cable length for this sensor is 860 mm.
You can cross-reference the listed OEM Part Numbers in the product description (e.g., 1433940, MHK000220, 11781433940) with your vehicle's specific parts catalog or consult with a dealership.
Ensure the sensor is correctly seated and the electrical connector is fully secured. The CEL may also indicate other issues or require a diagnostic scan to clear old fault codes.
Verify that the sensor was installed by a qualified mechanic and that the correct part number was used. Check for exhaust leaks near the sensor installation point.
Apply a penetrating lubricant to the threads and allow it to soak. Use a high-quality wrench and ensure it is securely fitted to avoid stripping the threads. Professional assistance may be needed.
Compatibility: This sensor is compatible with various BMW models including 3 Series E46, 5 Series E39, E60, E61, 7 Series E38, E65, E66, E67, X3 E83, X5 E53, Z3 E36, Z4 E85, and Land Rover models such as Range Rover MK III. Always verify your vehicle's specific requirements and compare with the listed OEM part numbers before purchasing.
Setup (Installation): Installation requires accessing the exhaust system post-catalytic converter. The old sensor is typically unscrewed using a 22 mm spanner, and the new sensor is screwed in, ensuring the M18 x 1.5 mm thread is properly seated. The connector should then be plugged into the corresponding harness. Professional installation by a fully qualified mechanic is mandatory for warranty coverage. Proof of professional installation will be required.
Care: Once installed, the sensor requires no routine user maintenance. Its performance is dependent on the overall health of the exhaust system and the vehicle's engine management system. Avoid harsh chemicals or excessive force when working near the sensor during other maintenance procedures.
