Reply With QuoteWere you getting a constact check light, or would it chime on once in a while and go away? Either way, that's cool that you fixed it, even though you bought a new sensor :P
Finally solved the Check Engine Light (1221 code)
I'm dumb.
I replaced the O2 sensor with one of the Bosch Universal O2 sensors - which involved cutting and splicing the existing 4 O2 sensor wires.
But I STILL got the check engine light with 1221 code.
It took many months, but I FINALLY figured out the problem...
I'll cut to the chase --> the connector in the engine compartment (drivers side by starter) that connects the O2 wires to whatever, wasn't FULLY connected. I gave it a little turn, and to my surprise, it clicked into place.
No more CE light!
:embarassed:
Erick
[edit: My gas mileage went from 14 to 17 mpg after reconnecting....]
Last edited by Erick; 05-04-2004 at 05:20 PM.
91 535iM
93 RS America
Major Contributor
Were you getting a constact check light, or would it chime on once in a while and go away? Either way, that's cool that you fixed it, even though you bought a new sensor :P
Custom Turbocharged 1991 535iM - 135k mi.
Allan,
The check engine light would always come on once the car reached normal operating temperature. No chime. The only code registered was the 1221.
Erick
91 535iM
93 RS America
Posting Permissions
