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I may have misunderstood you. What I was saying is (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by Bill R. on September 28, 2001 at 15:08:18:

In Reply to: Hmmmm.....Are you sure?...... posted by Paul Shovestul on September 28, 2001 at 14:13:31:

the code1221 is for o2 sensor #1. Code 1212 is for the o2 sensor #2 . Left and right. I gathered from your previous post that you meant that 1212 meant O2 sensor period. I was stating that its one side only not both.
Granted I'm much more familiar with the 6's, but my chart for V8's (DME M3.3) shows codes 1221/1212 for EGO sensor #1/#2 and 1222/1213 for Lambda Control #1/#2. #1/#2 indicate right/left. Unless this chart from Conforti's site is wrong, 1221 and 1222 apply to the SAME side of the V8. 1212 and 1213 apply to the other side

Paul Shovestul


sensor not the same as the 6's
but they indicate different problems in order to help in diagnosis. I believe 1221, "EGO sensor #1" indicates a problem with the signal from the O2 sensor. Could be a dead or failing sensor, or a bad electrical connection. I believe 1222, "Lambda Control #1", indicates that the oscillating signal is present, but the DME can't bring the O2 sensor signal into the range it is suppose to operate in, that is it's at or near the limit of it's mixture control, either full rich or full lean, and the signal is still wrong. This likely indicates a mechanical problem, ignition ( bad plugs), or fuel related (sticking/lazy fuel injector etc). I may have this reversed, but the DME is certainly smart enough to know the difference between these two types of errors.

Paul Shovestul


I thought the Lambda Control was the O2 sensor?






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