Does this look like normal O2 activity?
Evolving Member
Joined: Aug 2009
Posts: 128
Likes: 0
From: Herndon, VA
That is normal narrow O2 operation. What doesn't look normal is the 14.2 of the wide band.
Either your narrow band or your wide band are off.
You're narrow band is going to waiver back and forth around 0.5 volts, and that's exactly what you see here.
On a working and accurate narrow band O2 0.5 volts is 14.7 AFR, and what the computer is shooting for at idle.
Because your wide band is showing 14.2, it's one of two things. Either your narrow band is bad, and it's reading 0.5 volts at 14.2 AFR instead of 14.7, or your wide band is bad/out of calibration and is reading 14.2 instead of 14.7.
I'd start with recalibrating the wide band, and if that isn't the problem I'd replace whichever of the two is cheaper unless you have access to some other way to measure. They should agree with each other.
Either your narrow band or your wide band are off.
You're narrow band is going to waiver back and forth around 0.5 volts, and that's exactly what you see here.
On a working and accurate narrow band O2 0.5 volts is 14.7 AFR, and what the computer is shooting for at idle.
Because your wide band is showing 14.2, it's one of two things. Either your narrow band is bad, and it's reading 0.5 volts at 14.2 AFR instead of 14.7, or your wide band is bad/out of calibration and is reading 14.2 instead of 14.7.
I'd start with recalibrating the wide band, and if that isn't the problem I'd replace whichever of the two is cheaper unless you have access to some other way to measure. They should agree with each other.