Spark plug mystery

[Neil-y0jlk]

Can anyone help me identify which BMW this BM part number fits?

12.12.2.158.252

It is for a BMW branded spark plug which a friend found in his engine. He has an 07 E90 325i and I understand that the correct spark plug part number for that is 12.12.2.158.253 so I'm just trying to find out what the difference is between the two. I suspect that he could ask the BMW dealer but for reasons I won't bore you with he would find it hard to trust an answer from that source.

[Huff]

It'll be banal; there'll be both of an NGK and a Bosch plug recommendation for the car model/engine combo, and either will be just fine (OEM equiv)

Certainly no reason to get hung-up on BMW catalogue numbers, nor pay the resulting dealer-tax.

[helix402]

http://www.realoem.com/bmw/enUS/partxref?q=1212215...

It's the wrong plug for the car. The second no is correct.

Edited by helix402 on Saturday 28th January 06:36

[Neil-y0jlk]

Helix

Thanks that site is useful, just wish it indicated the engine that the mystery plug was meant to fit rather than just the model

Huff, this is not about being precious about branded parts or trying to save money, the wrong spark plugs were fitted to my friends car, I am trying to identify the characteristics of the engine that those plugs are meant to fit to try to establish what issues could be caused by fitting the wrong plugs.

[Neil-y0jlk]

Sorry Helix, just realised it does if you click through, obviously havent got my brain engaged yet. Thanks very much

[4rephill]

Neil-y0jlk said:

Helix

Thanks that site is useful, just wish it indicated the engine that the mystery plug was meant to fit rather than just the model.......

It's for the N46 series : https://www.etkbmw.com/bmw/EN/parts/info/Bougie+Hi...

[V8 TEJ]

I might be a bit late to the party, but possibly can help as I work at NGK who are the O.E. supplier of plugs to BMW. Both of the BMW numbers are NGK items, the details are:

12 12 2 158 252 = NGK IZFR6H11 (Iridium Plug)
12 12 2 158 253 = NGK PLZFR6A-11S (Platinum Plug - Long Thread Reach)

These 2 plugs are not interchangeable due to the thread length. 19mm Vs 26.5mm.

The E90 325i changed from N52 (2.5) to N53 (3.0) engine in 2007. This car appears to the the earlier version with the 2.5 engine as it takes a 14mm thread diameter plug with a 26.5mm thread reach.

Edited by V8 TEJ on Tuesday 31st January 14:10