On the replacement for the e46 (e90) the CCV was moved inside the valve cover and the CCV lines get electric heating to avoid the frozen issue potentially engine destroying condition. That in itself should tell you that BMW goofed big time on the design of this unit. Kit contains the following parts. Part# 11617501566 Crankcase Vent Valve By OEM. Part# 11157532649 Vent Valve to Oil Dip Stick Tube By CRP-Rein OEM. Part# 11611432559 Vent Valve to Valve Cover By CRP-Rein OEM. Part# 11617504535 Connecting Hose from Vent Valve By CRP-Rein OEM. Part# 11617504536 Return Pipe from Connecting Hose By Febi-Rein OEM. It's a pretty straight forward job, it just takes patience and determination. Some symptoms of a bad CCV can be: 1. Vacuum leak. Causes lack of power and may throw a CEL for o2 sensor adaptation limit. Gas mileage suffers. 2. Oil leaks. When the bottom hose gets clogged or decomposes, you'll get an oil leak. 4301 posts · Joined 2005. #5 · Feb 1, 2021. I may really depend on the climate for the area you are in. My E46 never had a CCV replacement until 180,000 miles but we live in a mild climate and it really only runs long distance runs up and down the eastern side of the country. Never any short trips as that is what clogs them up and kills them. 8-9 years would be the suggested time frame. Keep in mind that it is not only the issue of the CCV having problems in the cold, most of these are due to soft thermostats and short drives without a longer once a week 30-45 minute highway run. But the plastic pipes become brittle, crack and break and cause vacuum leaks. markusmarkus · #10 · May 10, 2019. Deleting the CCV without adding “someplace” for the “oily mayonnaise” to go is a recipe for disaster imho. Both the CCV and catch can solutions exist because all engines’ crankcase emit oily vapors. Years ago that oily vapor was merely dumped into the atmosphere. Hi guys. I have a `97 528 with 212k on it and I believe it is having symptoms of a bad CCV. Its currently idling rough at start up, smoke from the tail pipe, and a popping sound coming from the CCV area. Now I was wondering if anyone has tried and maybe even successful at cleaning one either Rough idling could be a dirty idle control valve (icv, likely), a failing crankshaft position sensor (cps, unlikely) or a bad/dirty throttle position sensor (tps, also unlikely). The cps's resistance should be tested when the engine is cold and when it is hot, to see if it is in range according to its specs. FjVj.