I can't believe it! After replacing the O2 sensor last fall, the CE light stayed off for 6 months. Then, lo and behold! It's back on again! AHHHH! Code 3 again (faulty Lambda control). OBD1 sucks!

Any help would be appreciated. Could my O2 have gone bad that fast? I have NO vaccum leaks. Car runs great but not as good on gas as before, exhaust smells a little. Any help appreciated greatly.

Thanks

 

How is your MAF?

Sometimes when the MAF goes bad the engine runs runs rich or lean & the 02 sensor gets a sniff of that & you get the 02 error message.

 

check under your passenger or driver carpet in front or behind the seats the O2 sensor wire runs under the carpet and somtimes gets water in it. known issue on 124 chasiss

 

Thanks.

In the meantime I had taken the o2 out and cleaned it with maf sensor cleaner, but noticed it was about 90% tightened so I tightened it back up all the way. Also I cleaned the MAF sensor at the same time.
The light hasn't come back on since (been 6 days now). So it could have been either the wires were wet, the O2 wasn't tight enough or the MAF sensor was dirty (or the O2 was contaminated?). All I know is the light is off for good this time. Your posts are very reassuring.
Thanks!