ok sorry for not being specific enough. this is a usa market non California car. I would assume the B1S1 means bank1 sensor 1. which one would that be and is it easy to change? Also... and I can call kia locally to ask, but would it be covered under the warranty.. it's a 100k warranty as I recall?There is one O2 sensor on each exhaust manifold, and some markets may have a third after the cat in the main pipe. The problem is deciding which one! They are relatively easy to replace and in this car actually reasonably easy to access, but sometimes like anything screwed into cast iron may be stuck or frozen in.
guys, sorry if these questions seem kind of basic, but it is not my vehicle. it is a transverse motor correct? so does that make this the sensor near the firewall or near the radiator? I thought it might be near firewall, but an not sure. would it be really accessible by just taking off that plastic engine cover?There are 2 up streams (near exh manifold) and 2 down streams. B1S1 is up stream, right hand.
Just shows the difference between markets, I just checked my car again I only have 2 sensors, both before the cats in the end of each manifold. The place for the after cat unit is there including the clips for the wiring but they are not fitted. I don't have the third cat after the V join in the pipe. This is a RHD March 2003 built car.On the 3.5 each exhaust bank has a pre-cat sensor and a post-cat sensor. There are not any Pre or Post on the third cat downstream.