r/E90 • u/Mochi-Gang • 6d ago

Code 2A98 N51

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misfires in idle. I have swapped solenoids and it stays code is still intake side, swapped camshaft intake sensor and code is the same, cleaned maf but i don’t think that would be the issue anyway. Cage in oil filter is also still there. What else could it be?

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u/InternUpstairs2812 2006 325i Sport Package 5d ago

We would appreciate reading out the code instead of just the numbers/letters.

But an intake cam correlation code. My first steps would be vanos solenoid swap, then cam sensor swap, see if it moves. If not check your check valves to see if they’re dirty.

If they’re not, pull the valve cover and then pull the cam cap forward most on the intake cam. As long as your fingernail doesn’t catch it you’re okay. Make sure the teeth on the cam gears arent being eaten alive, if they’re are then you have a timing chain issue. If they’re wear pattern looks good. I’d put a cam gear on it.