I'm curious about Lambda or Not - Downstream O2 Sensors for my '15 2.0L F-56 . I know the Probe Ends are the same (although irrelevant because it'll be zip-tied up) I want to know about the Plug End. I'm trying to find the cheapest downstream O2 Sensor I can find that'll fit the plug.I wanna be ready to go because I HATE little glowing yellow lights on my dash, I know I got a few 1000s to go. Thanks

 

We've been over this already!!

The front is a regulating Lambda
https://www.pelicanparts.com/More_In...-8-600-992-M14

rear is a Lambda monitor.
https://www.pelicanparts.com/More_In...-8-604-889-M14

 

I like Pelican Parts. thank you I don't understand Lambda, does it even matter ? - front means upper or pre-cat. - rear means lower or after-cat. correct ?

 

Lambda= Greek for Wave, as in sine wave.

As the CPU corrects the AFR.
The response of the O2 sensor goes up and down around the mean voltage representing proper AFR
Reading the O2 sensor reveals a sine wave around the reference voltage.
Too high means too rich, CPU leans fuel, too low means too lean, CPU richens fuel.
Its not a constant.

 

Bing, Bang, Boom ! looked at Pelican Parts (in my faves now) & my part. looked under my hood & got educated. I can now fix the O2 sensor problem for $123 in about 5 min for the LAST time. as opposed to $739 @ Mini & it will repeat itself saving $616. **** You is how Mini says "Trust Me". their mechanic & I talked for 5 min. & he confirmed my suspicion about the cat.less DP & repitition of downstream O2 sensor & you were a major help. THANKS I'm very ready to solve my only inherant problem I got when I bought this hot-rod. the next time it comes on, It's gonna get fixed proper. ALSO I now have dedicated Bimmerlink/android phone, because I scored iphone.