I've been meaning to replace my knock off sensors for a while but money is extra tight and they were working

Ish

I bought a two pack for $45 or something kler deal and they worked fine for most of a year.

One failed so they sent me a pair under warranty. That came in handy when the same one (bank one) failed a few months later.

About a week ago got an error for no heater bank one pre cat. Same damn sensor. Of course days after my tax refund was spent.

Got my "second tax refund" last wed and bought a pair of Bosch from fcp euro. I had to drive my car to and from Chicago burning 12% extra gas (fortunately that's as far as fuel trim will apparently go). Idle pretty rough indeed warmed up and did get a handful of misfires over a couple days.

Got the new sensors installed before my next trip to Chicago and reset adaptations before departure.

To my dismay: 12% fuel trim the whole trip down and the next day also.

So: normal sleuth says it's fuel delivery. Not cool.

Today I go to get some fuel injector cleaner and to my shock, fuel trims are like 3%.

WTF?

Anybody seen this before?

It's acting like there was a clog in the fuel pressure regulator that broke free or something. I didn't get a chance to meausre fuel pressure yet.

I'm hoping it was somehow an unlisted long LONG term fuel trim because of course the long term was reset when I reset codes and adaptations

75 mile drive Monday getting home. Fingers crossed I'll get better than 17 mpg on my trip up.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)