P0401
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions
system, and is used to reduce combustion temperature and pressure to control
Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR
valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE).
These things work together to deliver the correct amount of recirculation based
on engine temperature, load, etc. The P0401 code means that OBD detected an
insufficient amount of EGR.
P0402
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle
emmissions system, and is used to reduce combustion temperature and
pressure to control Oxides of Nitrogen. There are generally three parts
to the EGR system: the EGR valve, an actuator solenoid, and a
differential pressure sensor (DPF). These things work together to
deliver the correct amount of recirculation based on engine temperature,
load, etc. The P0402 code means that OBD detected an excessive amount
of EGR.
There sound like a bad EGR and need replace it.
P0755 Shift Solenoid B Malfunction and P0756 Shift Solenoid B Performance or Stuck Off. First I suggtes check leve fluids and preventive maintenance.
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Don't explain what it is because that not going to help, tell us what part to buy or what to do so we can buy the part or do what needs to be done to pass. Time is running when you have to read 100 post and still guessing.
401 and 402 (EGR flow insufficient) are likely a failed DPFE sensor. (EGR sensor) reformulated gasoline eats them alive. fix that, and clear the codes. the 755 and 756 are transmission codes usually shift solenoids, or lockup converter.
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