Almost had 2 months of not 1222....

[Golgade]

I was just pulling out of a parking lot and BAM! The CEL came back on..... grrr. After changing the O2 Sensors I have been free of the light and it was almost 2 months and 1000 miles. I assume its O2 sensor related after coming back on so soon. Did I some how fry out my o2 sensors already? What should I attempt to tackle now.............

[Tiger]

http://www.pelicanparts.com/bmw/tech...de_Reading.htm

You have to remember... just because it shoot O2 code doesn't mean O2 needs to be changed. It actually is telling you that something is wrong with your fuel injection system. 90% of the time... it is something other than O2.

[MBXB]

When I get a bad tank of gas, same thing happens to me till I burn through a couple of tanks.

[tim s]

my cats where blocked causing the issue.
tim s.

[Golgade]

my cats where blocked causing the issue.
tim s.

I am willing to bet that it the same with me. The light did go out and has been out for a few days, but I bet its just going to pop up more and more. What were the symptoms of haivng blocked cats, did you just kill o2 sensors? Did you exaust produce a rather smelly oder?

[Tiger]

Signs of failing cat... lots of knocking, rattling sound. Loss of engine power if clogged.

Reason for failing cat... raw fuel burned by cat converter.

What cause raw fuel to reach cat? Leaky fue injector, bad coil boot (oil in spark plug well... shorting sparks), bad coils or bad AFM. Lots of white smokes coming out of tail pipe is sure sign of bad coil boot.

Like I said, O2 code does not mean O2 is dead... easily checked with scanner.

[632 Regal]

reboot the computer and pretend it never happened. You did replace all intake gaskets and plate gaskets?

[Kibokojoe]

Yeap a Shogun reboot

[Golgade]

Reboot and Pretending it didnt happen is my plan,Yeah I did replace the intake gaskets, the plate, O2 sensors, fuel filters, plugs, valve cover gaskets, coil boots, MAF, and done a pretty extensive vaccum leak check. So I really think I have covered everything it could be, aside from a clogged cat, and the only symptom I have for that is a real acrid smelling exaust. But from the sounds of what alot of you guys are saying the CEL is just something that can come on for silly reasons, and go off just as soon, so I really shouldnt stress it(which is usually my problem).

[tim s]

i did not know when i bought the car they were blocked, i got random 1222 errors, but did not find blocked cats till i replaced the tranny, its amazing how quick it gets to the redline now.
tim s.