NGK Mercedes-Benz SLK55 AMG 2016-2012 Direct Fit 5-Wire Wideband A/F Sensor

NGK Mercedes-Benz SLK55 AMG 2016-2012 Direct Fit 5-Wire Wideband A/F Sensor

Marsoni

M251S

$163.50

Get it in 3 business days with 1 day shipping. Friday, May 29

NGK Mercedes-Benz SLK55 AMG 2016-2012 Direct Fit 5-Wire Wideband A/F SensorNTK is the world's largest supplier and manufacturer of OEM oxygen sensors. Oxygen sensors play a critical role as part of the vehicle's on board diagnostic system in maintaining optimal engine performance, maximizing fuel efficiency and reducing harmful emissions. While conventional switching oxygen sensors only switch rich or lean, wideband oxygen (or Air Fuel Ratio) sensors produce a linear output signal that allows the ECU determine exactly how

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This relay has experienced failure again after just a couple of months of use. It's not the mag coil that fails but rather the contacts are of such low quality that they corrode beyond their ability to conduct power, and fast. I have had to change two of these so far and am on the third one. The seller will ship replacements but who wants to keep replacing them? I have to travel in my RV with a spare. This relay has never been exposed to the elements. It's safely mounted inside a sealed bay. Be aware of any brands that look like this, they are all the same.

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Reviewed in the United States on November 15, 2025