The DTCP0470 OBDII code refers to the Exhaust Pressure Sensor (EPS) input signal. It is set when there is no match with the exhaust manifold pressure. This code is set because of some electrical problems in the sensor, controller, or circuit. On the other hand, mechanical problems are not ruled out.
The P0470 OBD2 fault code is set due to the following reasons:
A possible blockage between the exhaust manifold and the EPS sensor.
The EVAP (The Evaporative Emission Control System) may be leaking.
The EPS Sensor may be in poor condition.
Possible solutions of the DTC code P0470 Generic
To troubleshoot the P0470 OBDII diagnostic code, try this:
Disconnect the pipe between the Exhaust Pressure Sensor and the exhaust manifold. Verify that there is no carbon inside the pipe. Make sure that electrical components such as connectors and cables are good. If you find faults in these components, make repairs.
Check for leaks in the pipe connecting the turbocharger and intake manifold. You must tighten all the hose clamps.
Disconnect the harness from the EPS Sensor. Test the 5-volt power circuit by using a DVOM. If the reading is higher than that voltage, there is a short in the wiring between the PCMand the EPS Sensor, fix it.
Test that 5 volts are present in the EPS Sensor signal circuit. If that voltage is not present or is higher, there is a problem with the wiring. Repair it.