X15 misfire codes 1, 2, 3

[Rawze]

(04-28-2025 )Dieseltech53 Wrote:  The sensor I got right from cummins. I will try cleaning the tube but I could feel vacuum on the port when it was running so did not assume it was plugged.

There should be no vacuum at the exhaust manifold pressure sensor port.

I think your missing some relevant info there ... The exhaust man sensor is not only measuring pressure ... but also 'listening' to the sound waves/pulses (popping sound) from each of the cylinders as each exhaust valves open (hence the mis-fire detection). That passage tends to clog or get partially clogged ... throwing off the sounds into the sensor, so it needs to stay clean ... and its notorious for getting dirty over time or the pipe at the manifold getting loose/cracked, etc.