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E39 (1997 - 2003) The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki
Pumping/Pulsing sound in rear engine (passenger side)
I did a search of this issue on the forums but I can't seem to find another noise post that is similar to mine. I noticed a rhythmic sound recently and it only happens after the engine is warmed and the car's been driven a few miles. It's most noticeable when I'm idle. The noise is coming from the rear side and it sounds louder the closer I get to the passenger side wheel.
I had a pre-cat o2 sensor code come up a few weeks back but I replaced those. No other CELs at the moment and I'm getting fairly good gas mileage. Any suggestion is appreciated.