Quote:
Originally Posted by DaanBMW
Yeah, I'd also like to know WHY this should be done as a matter of maintenance and not just if any codes are triggered. What does it fix or improve ? How can you tell you might need it, short of any codes ? Rough idling is one symptom mentioned, anything else ?
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OK, I answered my own questions: I replaced mine and my engine is def running noticeably smoother. Never had any codes. Had some vibrations on a certain uphill portion of a freeway, and sometimes jerkiness at v. low speeds. Both are either reduced or gone.
1 caveat: I actually replaced the ones on the car - the old p/n 11367516293 - with the new p/n 11367585425. And I got them used, & cleaned them up really well.