Intermittent CEL: code 1221 "EGO SENSOR"?

[WhatWentWong]

My 318iS is popping intermittment check engine light, usually comes on with a steady state throttle or RPM above 3000. Light goes out with throttle lift off. The stomp test tells me its code 1221 "EGO SENSOR". Is this the O2 Sensor? I ask this because code 1222 is supposedly "LAMBDA CONTROL" (I didn't pop this code).

thanks in advance.

Lincoln
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[Danny]

Lazy O2 sensor?

[Hick]

Stuff a few of these in front of the radiator. should fix her up.

Is it running funny otherwise?

[SamE30e]

Lambada code is a dumb code. It basically says something is wrong with your engine.. Points out the obvious and doesn't give detail.

[WhatWentWong]

I've confirmed that this light comes on without fail under heavy load, ie, 5 gear pull from say, 30kph.

I wonder if this has anything to do with me running 90 octane, not 91?

[Danny]

Your running rich.

[Rolla1990]

Your EGO is your oxygen sensor. EGO means Exhaust Gas Oxygen.

[LBC28730]

Super zombie thread but, this is almost exactly what I am dealing with, although I seem to have it trigger at even lower rpms, under load.

If I'm just cruising down the highway on fairly flat ground, there's no issues.
That doesn't happen much as I live in the mountains.

Under load (going up a steep hill) I get the CEL, very poor running, MPG gauge pegs down.
Once I reach the crest and load decreases, the light typically goes out fairly quickly.

I have another O2 sensor on the way, but I don't that that is going to completely solve my issue.

Fuel pump is new. All other fuel related tests re Bentley manual, have passed good.

Smoke test shows no leaks.

I read how many people have gone through so much and that the code can basically be anything.....so that's not very encouraging.

I am going to check C191 tonight.