I have a problem with my 2003 cadillac cts code po141 i have replaced the o2 sensor on the passenger side before the cat but i still have the same problem

If your vehicle has single exhaust, there are two oxygen sensors.

If your vehicle has dual exhaust, there are four oxygen sensors.

There are two locatons for the fuse and relay llocations one is under the hood on the passenger side and the other is under the back seat!!!

Bank 1 Sensor 2 signal is indicating a lean condition, replace the O2 sensor. Right side (passenger) after the Cat.

o2 sensor heater circuit malfunction bank 1 sensor 2 problem with o2 can be internal or with wiring harness-connector the sensor is the one located after the cat converter

2003 cavaleir with code po141. this codes is saying o2 heater , so yes if sensor wiring is good then o2 is bad, but which o2 did you change? the correct o2 is the rear one after the converter not before the coverter, theres one up by the engine and i think its on the exhaust manifold and then another o2 down on the exhaust after the cat, thats the one you need to replace, let me know is thats the one, if not and you replaced the one at engine then replace the other one after the cat and this will solve the problem, let me know hope this is helpful.

Code PO141 indicates that the heater circuit in the Oxygen Sensor mounted in Bank 1 (Driver's Side) is not working properly. The ECM has determined that the sensor is taking too long to heat up to around 600 degrees and then switch out of close loop mode. If the ECM determines that it is taking too long then a code PO141 will be set. Normally it is the sensor itself that is defective. Replacing the sensor normally will fix the problem. However it can be the wiring harness or a a bad connection. Check the wiring carefully and look for a short in the wiring. If you find none then replace the O2 Sensor. If this does not repair the problem do not replace any other parts. Time to take it to a professional with professional tools and diagnostic skills to find the problem. The O2 sensor is more than likely the problem but there is no guarantee that will fix it.

O2 (oxygen) sensor (also known as lambda sensor) set into the side of the exhaust manifold needs to be looked at and replaced if faulty. This sensor checks on the amount of oxygen remaining in the exhaust after combustion. The response of the these sensors gets a bit sluggish as they get older and this is what your ECU has probably picked up on. The car can still be driven but it will become increasingly rough and fuel economy will suffer.

It's the 02 sensor heater circuit, bank1 #2 sensor, that's the one down by the cat converter. Have a new one put in.

http://www.honda-tech.com/showthread.php?t=2385730 good luck!

Bank 2 Sensor 1 is on the driver side - follow the right side of the engine down the headers which attaches to the catalytic converter. The o2 Sensor you're asking about (Bank 2 Sensor 1) is before the Catalytic. The o2 Sensor after the Catalytic is Bank 2 Sensor 2. Bank 1 Sensor 1 is on the passenger side as well as Bank 1 Sensor 2.