CEL P1276 & P0153

[shihman]

hi guys, i have a 2000 boxster s and i need some help with identifying the oxygen sensor that i need for error code p1276 and p0153. i have done some research on this topic and have came up with few threads covering this but still a little confused. the confusion is this error code indicates a bad O2 sensor at bank 2 sensor 1, which is on the driver side before the cat converter (number 1 in the diagram below). and the parts number someone has posted is bosch 13806 which is for a post cat sensor. so i just need someone to clear this up before i purchase the parts. please help. thank you all.

ps. please let me know the number in the diagram below.

[Loren]

That is the O2 sensor ahead of the cat on bank 2.

Are you sure you do not have an exhaust leak - an exhaust leak can cause that also.

[shihman]

i am sorry if i am asking all kind of elementary questions. how can you tell if it is just a exhaust leak?

[Loren]

Well, it is easiest to put the car up on a rack running and then look and check for leaks before the cats (i.e. headers, connections at the heads and cats.

Obvious would be holes or cracks - less obvious would be small cracks or leaking gaskets. You can usually hear an exhaust leak when you are close to it.

[shihman]

hey loren, thank so much for your advise and help. i'll try that first before i order the o2 sensor. but can you tell me from my diagram which o2 sensor is the 1 i need? i'll let you know what i find. thanks again.

[Loren]

http://www.renntech.org/forums/index.php?s...ost&p=29574