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B58 PCV Replacement
Fits
Gen 1 B58 whistling at idle or puffing blue smoke on a cold start? BMW's own bulletin points at one small part: the PCV diaphragm in the valve cover. You can replace it with the valve cover still on the car.
- 15 years
- or 150,000 miles: BMW's extended coverage on this valve for US cars. Check it before you buy anything.
- 4 parts
- in BMW's repair kit: cap, diaphragm, support disc and spring.
- 6 locks
- hold the cap on. Release all six to open it. Hear all six click to close it.
Signs it has split
- Blue or white smoke after a cold start
- A high-pitched whistle under the engine cover at idle
- Cylinder 6 misfire codes 140601 or 140610
- Shudder or limp mode
BMW's test is crankcase vacuum: near -50 mbar is normal, near -100 mbar means a failed valve. Driveway version, not BMW's: at idle, strong suction on the oil filler cap points the same way.
Check the warranty first
- It may be free. BMW bulletin SI B01 14 23 (November 13, 2023) covers this valve for 15 years or 150,000 miles on US cars. It is not a recall. Call a dealer with your VIN first.
- Already paid? If a dealer or shop did this repair before the extension, BMW takes claims at BMW-RP.com, reference B-ELWR PCV 15Y150M.
- Tuned, modified, over the miles or outside the US? BMW's terms exclude outside influences and non-genuine parts, so the dealer may say no. That is when you do it yourself. BMW does not pay you back for your own repair.
What you need
- Repair kit, BMW part number 11 12 1 025 447
- A small flat screwdriver or plastic trim tool
- A clean rag and a cold engine
We stock the Bremmen Parts kit that crosses to that BMW number.
How to replace it
- Engine cold, engine cover off. Lift it straight up, one mount at a time. BMW's rule: 68°F (20°C) or warmer and no jerking, or the cover can break.
- Find the round cap on the valve cover, next to the oil filler cap.
- Release the cap. Free all six locks with the screwdriver before you lift. Go easy: BMW warns that force damages the locks.
- Lift out the old parts. Diaphragm and support disc together, then the spring. Keep dirt out of the opening.
- New parts in. Seat the spring square. Fit the diaphragm and support disc together, then set them on the spring. BMW flags that this can go together the wrong way: match how the old parts came out.
- Press on the new cap until all six locks click.
- Engine cover on, start it, clear the codes. The whistle should be gone.
Cars this covers
US models on BMW's bulletin, xDrive included. Your VIN decides.
| Model | Model years |
|---|---|
| M240i (F22, F23) | 2017 to 2021 |
| 340i sedan (F30) | 2016 to 2018 |
| 340i Gran Turismo (F34) | 2017 to 2019 |
| 440i (F32, F33, F36) | 2017 to 2020 |
| 540i (G30) | 2017 to 2019 |
| 640i Gran Turismo (G32) | 2018 to 2019 |
| 740i, listed by BMW as 740Li (G12) | 2016 to 2019 |
| X3 M40i (G01) | 2018 to 2019 |
| X4 M40i (G02) | 2019 |
Later B58 engines (B58TU, such as the G20 M340i and the G05 X5 xDrive40i) are not on BMW's list for this valve cover. This guide and this kit are not for them.
Sources: BMW of North America service bulletin SI B01 14 23, dated November 13, 2023, on file with NHTSA, and BMW's repair instructions for the B58 engine. Coverage terms can change: confirm with a BMW dealer by VIN. This guide is our own summary. If you are not comfortable doing the work, have a shop do it.