2021 MX13 pac car dpf and scr efficiency issues in need of egr tuneup

[mikkhh]

new sensor installed 4-6 hPa ignition on. On another truck shows zero, new sensor there shows zero. Have run the calibration. Have also tested with pressure gauge with sensor unplugged and only applying pressure to high side

After engine running some time and turned off sensor reads zero until I remove key and do ignition on after some minutes sensor reads 6hPa. Same with sensor from a working truck and also one from a wheel loader. Wiggling wires did not change anything

Will test another dpf/scr ecu from another truck, will try to plug it in and see if reading moves with ecu. If yes I will pull programming and swap those ecu s around and see what happens.

That aftertreatment ecu fault is common cause on dd13 15 for differential pressure issues.