spy2520

iTrader: (3)

As the title suggests, I've been having an abnormal o2 laziness problem.

Whats happening is either 1 or both o2 sensors will fall to ~0mV a while after warming up. Its intermittent. It happened 40 miles into a trip on relatively o2 sensors. Doesn't happen on every trip. Seems to mainly happen at a steady state like idle or cruising. Codes are p1133 and p1153.

when it does this the trims shoot way up and the car misfires, then it finally fails and falls into open loop where the wideband shows a lambda of 1.0 and the car runs perfect. Also the wideband and narrowbands seem to agree that everything is fine up until the narrowband sensors basically die.

Any ideas? Maybe a harness problem?

Exidous

iTrader: (11)

It could be a ground common to both banks of O2 sensors. Do they both flat line at the same time?

spy2520

iTrader: (3)

No they don't, at first it was the passenger side. I replaced it. Then about a month later same problem. Replaced again, then a few weeks later the drivers side did it. It never happens right away though. 40 miles into a trip was one example, alot of times it would just be about 10 minutes into my route to work.

Lately I've just been running with trims turned off.

MMWS6

Got long tubes in it? What's the cam? If your long tubed with a cam you'll want to just use the wideband, forget the narrows, they are useless if you have either or both in there

spy2520

iTrader: (3)

Longtubes but no cam yet. The strange thing is it was fine for over a year. Just started crapping out this past winter. Right now i have trims turned off, but i left the MIL on so i can roughly monitor what the o2s are doing, the light comes and goes throughout the week.