1998 BMW 323 Oxygen Sensors

if the left and right o2 sensor connectors were spliced together into one and hooked BEFORE the convertor then that woudl have no effect on the engine whatsoever, just wont be as accurate with orrecting lean left and right conditions.

what i woudl do is drill and weld in o2 bungs and hook them up the way they are supposed to.

the last sensor is for convertor effeicency and has nothing to do with performance.

[quote:cdce06d71a="blackop555"]if the left and right o2 sensor connectors were spliced together into one and hooked BEFORE the convertor then that woudl have no effect on the engine whatsoever, just wont be as accurate with orrecting lean left and right conditions.

what i woudl do is drill and weld in o2 bungs and hook them up the way they are supposed to.

the last sensor is for convertor effeicency and has nothing to do with performance.[/quote:cdce06d71a]

OK, my base concern is passing emissions testing. This really looks like a "factory" installation. There are "plugged" bungs in the manifolds already. Since the car has passed OBD II checks in the past (the sensors are now >118K mi) I have to think just replacing the existing one(s) will satisfy the computer.

The pre-cat oxygen sensors are for bank I and bank II.
Bank I is the first three cylinders and bank II is cylinders 4, 5, and 6. The sensors are located on the exhaust manifolds. If there is only one pre cat sensor on the car, there will probably be an issue getting the cat past smog due to OBDII criteria, I request you repost with the VIN so that I can know some more about the car. I have also E-mailed you a picture of the exhaust manifolds. Dr. Hagerty ♥