Northstar Engines and System Technical Discussion Discussion, 99 eldorado 02 sensors in Cadillac Engine Discussion; Can someone tell me how many o2 sensors are in a 99 cadillac eldorado are and there location in the ...
99 eldorado 02 sensors Can someone tell me how many o2 sensors are in a 99 cadillac eldorado are and there location in the vehicle please??
Re: 99 eldorado 02 sensors You probably have 4.
Bank 1 is the right (rear) cylinder bank
Bank 2 is the left (front) cylinder bank
B2S1 is in the left bank exhaust manifold collector
B1S1 is in the right bank exhaust manifold top
B1S2 is in the pipe just ahead of the cat
B1S3 is in the pipe just after the cat
In the 2000 and later engines there is no pre-cat sensor, so the after-cat one becomes B1S2. Re: 99 eldorado 02 sensors Wouldn't swear to it, but I seem to recall Cadillac dropping the pre-CAT sensor between '98 & '00 (my '97 still had it).