Abnormal idle

[ALX5]

Hi everyone
Need your help with this code. I used OBD II scanner and got P0305 code. I did change both intake and exhaust sensors but the code is still persistant. I took the X to an independent shop and got couple codes
1- 18: EWS signal. The tech said it is the key. He told me to use another set of key
2- 204: Idle control. He said my X has abnormal idle. He think I have my have air vacum leak or some sort of things. Does anyone have this experience before?
3 & 4: No description.
any help would appreciate.

ALX5

[The Cleaner]

hard to know specificly whats happening, but P0305 is a cylinder 5 misfire. change the plug, connector and coil for that hole and I'll bet you are cured. Misfire code on only one cylinder has proven to be the coil in every case I have done in the past 4 cars.

[Nick-NY]

is the coil a Bremi unit? if so there is a SIB out about replacing them with BOSCH coils.

[The Cleaner]

Only from 10/02 on should they be replaced (and only on failure if you are talking customer pay). The Early Bremi Coils were fine, they actually last longer than the early bosch from my experience. I just did an E36 with Bremi coils that had 165k on the original ones... not bad !

[youry]

Originally Posted by The Cleaner

Misfire code on only one cylinder has proven to be the coil in every case I have done in the past 4 cars.

What if I get misfire code for 3 cylinders? P0302, P0303 and P0305. Should I change the spark plugs and coils or should I look into O2 sensors? Thank you