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Root Cause: probably a couple of things Sadly, I feel that there isn't enough data here to uncover the smoking gun, but I have realized some things upon reflection that can indicate what is probably wrong with the vehicle: Question 1 If the front lambda sensor voltage is indicating rich, why is the fuel trim positive (indicating that the injector ...


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There are currently two kinds of narrowband sensors used these days: titania sensors (NTK) and zirconia (Bosch). This answer only addresses the zirconia sensors which are the most common type. Referring to the diagram (which was created by Michael Handrich and shared under a Creative Commons license), the sensor is a galvanic cell that generates what's ...


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The other answers have covered most things, but here are two points that haven't yet been mentioned. Warranty This is usually a function of the supplier rather than the manufacturer, but some places offer a lifetime guarantee. Others offer none. Physical fit How hard could it possibly be to make accurate threads? Apparently pretty hard for some ...



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