check engine issues 1221 code - BMW Forum

seven · 08-31-2007, 06:50 PM

I have a problem with the o2 sensor. I had the check engine light come on 1221 code. o2 sensor no problem changed the sensor and the light went out. now it will come back on and go off sometimes quickly sometimes it takes a couple days. I notice no running problems. runs idles and the fuel mileage is the same. has anybody had this problem before? If so how did you fix it? Thanks for all your help in the past

seven · 08-31-2007, 09:41 PM

Forgot to mention the car is a 1993 325 is 5 speed. o2 sensor was replaced with a Bosch unit the car also has a Dinan cold air intake any help would be appreciated

spicer · 10-03-2007, 09:57 AM

was that the pre or post cat sensor?

Marknhl · 10-12-2007, 11:24 PM

I love BMW's but I think some of their sensors aren't the greatest. I replaced my O2 sensor with an $81 Bosch sensor a couple of months ago and I had the sensor turn on and off the other day. I was PISSED when I saw it come on and tested it manually finding out it was the O2 sensor again. The next day it was gone however, and I was happy again - ha. Hasn't turned on since. My onboard computer likes to tell me i'm low coolant all the time - common E36 problem from what I read here - it also likes to tell me there is a fault in the brake light system - haven't found one, lights work fine. My license plate light decided to turn off the other night as well. I figured out how to take it apart, did so, put it back together, and when I got to the auto parts store it was working fine. Go figure. Personally, I wouldn't even worry about it unless it happens excessively, and even then if the car is running fine and you can't find any issues..... unless anyone else has some thoughts....

seven · 10-20-2007, 09:57 AM

No running issues at all. my car always tell me the coolant is low and a license plate light failure. must be a common problem. I have decided not to worry about it I have pulled enough hair out

seven · 10-20-2007, 09:58 AM

found the fix to the check engine light!!! a small piece of black tape on the dash and the light dissappears

Texbeamer · 10-20-2007, 10:25 AM

Quote:

Originally Posted by seven

found the fix to the check engine light!!! a small piece of black tape on the dash and the light dissappears

whosyadadie01 · 10-28-2007, 07:35 PM

lmfao i wish.. ive got a check engine light and when scanned it says o2 sensor voltage for the sensors i just replaced .. any idea if its cuz i used a universal o2 sensor and not a oem cuz it is missin on the cyl's they are connected to