O2 Sensors and stuck AFR

ArweenX1 · 06-03-2020, 12:44 AM

Hello everyone,

Recently changed my bank 1 and bank 2 sensors on my n54. After changing them the first day everything was smooth sailing until today now when I look at the AFR readings on the JB4 app bank 1 will be at 20 the whole time no matter if it's at idle or I give it gas while afr2 reads normally and responds to the throttle. Upon starting the car both of them will be right at 14.9 which is normal but after some short driving pre cat oxygen senors are reading 20 and it just stays that way. Stuttering idle on first start

Not sure if it matters but I also do have the following ; e40 blend with jb4 and backend flash

JM98 · 06-03-2020, 12:52 AM

If its intermittent check the connection, if it persists you likely have a faulty sensor

06-03-2020, 12:44 AM	#1
ArweenX1 Private First Class 21 Rep 108 Posts Drives: 2009 E90 LCI 335i Join Date: Mar 2016 Location: Buffalo, NY iTrader: (0)	O2 Sensors and stuck AFR Hello everyone, Recently changed my bank 1 and bank 2 sensors on my n54. After changing them the first day everything was smooth sailing until today now when I look at the AFR readings on the JB4 app bank 1 will be at 20 the whole time no matter if it's at idle or I give it gas while afr2 reads normally and responds to the throttle. Upon starting the car both of them will be right at 14.9 which is normal but after some short driving pre cat oxygen senors are reading 20 and it just stays that way. Stuttering idle on first start Not sure if it matters but I also do have the following ; e40 blend with jb4 and backend flash
	Appreciate 0 Tweet Quote

06-03-2020, 12:52 AM	#2
JM98 Lieutenant 397 Rep 532 Posts Drives: 2009 135i Join Date: May 2016 Location: SoCal iTrader: (0)	If its intermittent check the connection, if it persists you likely have a faulty sensor
	Appreciate 0 Quote