[Efthreeoh]

Alright, looking for opinions on replacing the knock sensor on my N52 (for the Z4). Thinking I can just pull the alternator and go in from the front? Has anyone tried it? A rat got to the Z4 and chewed a bunch of wires. Stuffed the area between the intake manifold and block with food for the winter. I cleaned it all out and found he nipped the knock sensor harness to the Bank 2 knock sensor. It was just a nick to the ground wire and I repaired it with liquid electrical tape, but now the ECU is pulling a knock sensor code. Maybe he took a bite on the Bank 1 side too. I've not yet looked to be sure. While the intake is easier to pull on the Z4 (there is more room in the engine bay than an E90), I'd rather be minimally invasive with the surgery.

If anyone has tried replacing the knock sensor without removing the intake, please shout out. Trying to decide if new AL bolts for the alternator or new intake gaskets should be on my parts order....

TIA

[NZE90]

Yes i have replaced mine. Just removed the alternator. I replaced all the bolts when i did mine.

[Efthreeoh]

Originally Posted by NZE90

Yes i have replaced mine. Just removed the alternator. I replaced all the bolts when i did mine.

Thanks. Not too difficult it sounds like.

[Efthreeoh]

Originally Posted by NZE90

Yes i have replaced mine. Just removed the alternator. I replaced all the bolts when i did mine.

Again, thanks for the reply. But, lol, I went to order the parts this morning and remembered I have been thinking of refreshing the DISA valves (the car is at 121,000 miles), so I bit the whole hog and went full in for new DISAs and the PCV hose. I'm sure the engine is running on a preloaded map with the knock sensor code present, but lately (pre-code) the DISA switch over has been a bit rough and worse now, so I might as well just refresh it all. And I'm not one just to preemptively throw parts at my BMW, but a DISA shaft munching an intake valve I'd like to avoid.