Receiving same two codes (p0401 and P1296 and I cleared them with a cheap Walmart OBDII/EOBD). I did purchase a new MAP sensor and I will clean things up this week end, like the EGR Diffuser and install new MAP sensorFound this
P1296 - EGR system slow response.
This means that the EGR mass flow rate is changing too slowly compared to what the setpoint value is asking for. Since you don't have any EGR valve position faults, then likely the EGR system is sooted up or obstructed.
P0401 EGR Flow insufficient
1 hour highway speed ride should clean it upI did clean up EGR Tube and installed a new MAP and the light did go off. I still have issues related to P0401 from my Bosch 1200 to include:
1.Fuel system Mon (INC)
2. NMHC Cat Mon (DIS)
3. Exhst Gas Sensr (INC)
4PM Filter mon (Inc)
I am assuming the INC is incomplete not sure on the DIS
I cleanup and I drove from WI (76MPH) to South Dakota (82 MPH) on Monday March 15, 2019 and I am getting a silent code where the engine idiot light does not come on and when I check the code is still there. It maybe the ECU maintains previous codes. Not sure. My MPH increased from 18 MPH to 24 MPH after clean up job1 hour highway speed ride should clean it up