Zero at Short term fuel % trim
#1
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My Ride: 2008 528i
Zero at Short term fuel % trim
Hi,
my 2008 528i had check eng light. After some work done including
verified all fuses are good including those in ECU, I am more leaning
towards the O2 sensor. The code is P165F and 2CA6. The voltage readings
for B1S2 and B2S2 are seemed fine (0.5-0.7v). But no readings for B1S1 and B2S1.
Today I noticed the STFT1 is always at zero. STFT2 is OK moving up and down.
Also LTFT1&2 are OK. See attached.
Is the zero meaning the bad B1S1 O2 sensor?
Thanks
my 2008 528i had check eng light. After some work done including
verified all fuses are good including those in ECU, I am more leaning
towards the O2 sensor. The code is P165F and 2CA6. The voltage readings
for B1S2 and B2S2 are seemed fine (0.5-0.7v). But no readings for B1S1 and B2S1.
Today I noticed the STFT1 is always at zero. STFT2 is OK moving up and down.
Also LTFT1&2 are OK. See attached.
Is the zero meaning the bad B1S1 O2 sensor?
Thanks
#2
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Join Date: Apr 2014
Location: Fresno
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My Ride: 2008 528i
I went ahead and changed the O2 sensor on B1S1. Same problem remains. The reading is still 0. Same P165F code with Check Eng. light on.
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01-12-2006 12:42 PM