You don't have longtube headers with o2 extensions, do you?? If yes,that combination has been known to cause the code.If no,the obdll info at the bottom explains the other possible causes of the code.
Bank 2 sensor 1= o2 sensor on the driver side pre cat position.
If your battery has to be disconnected for any reason while its at the shop,make sure your readiness monitors are all complete before you go to the testing facility.These can be checked with a scan tool to verify their status.If you dont own a scanner,get one.Walmart sells one for $34.88 which has live & freeze frame data,IM readiness status,clears codes,etc,etc.
On the 86-95 Mustangs,when a emission related sensor was replaced,the battery had to be disconnected to both clear the codes out and clear the kam (keep alive memory).Im unsure if the same is needed for the 96+ models??If it is,drive cycles will be needed to set the readiness monitors again.
91 LX 342ci (10.5:1)
TFS 190cc (stage ll)
TFS Track Heat
Flowtech 1 3/4" Shorties
Weld ProStar XP'S
ISIT EVER ENUFF
Last edited by wbrockstar; October 13th, 2019 at 09:04 PM.
Reason: Additional Info