need help ASAP!!!!

[02bmw320i]

hi guys im new to this forum but i have a 02 BMW 320i and its throwing codes 1351 (misfire cylinder 5 with fuel cut off) P0430 (catalyst system efficiency below threshold bank 2) P0155 ( 02 heater circuit bank 2 censor 1) any suggestions on what to do

[jabela]

P1351 is likely a bad coil or plug. Try swapping with another cylinder to see if it follows.
http://forum.e46fanatics.com/showthread.php?t=826789

P0430 could be bad O2 sensors if they haven't been changed in the last 80k KM. It could also be bad CATs
http://forum.e46fanatics.com/showthread.php?t=1018162
http://www.bimmerfest.com/forums/sho...d.php?t=391106

P0155 points to bad O2 sensors.
http://www.e46fanatics.com/forum/sho...d.php?t=822014
https://www.bimmerforums.com/forum/s...r-circuit-Help!

How many KMs on your car?
All of your problems could be because of bad O2 sensors and/or bad CATs.
My recommendation would be to buy new pre-cat O2 sensors from www.rockauto.com and see if that fixes your problems.

[02bmw320i]

their is 197 thou on car and i will look into all those things thanks for all the help

[02bmw320i]

and correct me if im wrong i was told if i put and intake manifold off a 328i it will increase my top end

[jabela]

Originally Posted by 02bmw320i

and correct me if im wrong i was told if i put and intake manifold off a 328i it will increase my top end

I think I've seen something about swapping the intake and throttle. You'll probably need a tune as well. Google for it.