Code p 0470 ford aspire how do i fix this ?

P0400 - Exhaust Gas Recirculation (EGR) Flow Description: The electric EGR (EEGR) system is monitored once per drive cycle during steady state conditions above 77 km/h (48 mph). The test fails when a concern is detected by powertrain control module (PCM) calculations indicating the EGR flow is less or greater than expected. Possible Causes:

• EEGR valve stuck open or closed
• Connector to EEGR not seated
• EEGR motor winding circuits short or open
• No voltage to the EEGR
• Harness open or shorted to voltage or ground
• Vacuum signal to manifold absolute pressure (MAP) restricted or leaking
• Mass air flow (MAF) sensor signal erroneous
• Carbon build up in the EEGR valve seat area
• One or more sensors is not responding or is out of range

Diagnostic Aids: All of the following sensors input data to the PCM for correct operation of the EEGR system: engine coolant temperature (ECT), crankshaft position (CKP), intake air temperature (IAT), MAF, throttle position (TP), MAP. Any DTC relating to these sensors must be resolved prior to addressing code P0400. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test KD . Wells Ford EGR DPFE Training with Sgt Tech P0400 P0401 P0402

The fault is somewhere around the EGR valve - probably the EGR valve or the throttle position sensor.

Before replacing any sensors try removing and cleaning the EGR.

Here's a Youtube link that may be of help to you:

1999 maxima egr Google Search

This link explains about the EGR:
P0400 Exhaust Gas Recirculation Flow Malfunction

CEL code P0400 EGR Flow Malfunction

code p 0470 refers to exhaust gas pressure pressure sensor ---circuit malfunction====causes --wiring---exhaust gas pressure sensor ---ECM
if you have no fuel check the pump and pump relay for operation

P0400 Exhaust Gas Recirculation Flow Malfunction
P0235 Turbocharger Supercharger Boost Sensor Circuit Malfunction

I would say the EGR Valve is faulty- stuck open. I think the second code ( P0235) is being generated due to the EGR problem.

P1400 Exhaust Gas Recirculation valve position sensor
P1401 Exhaust Gas Recirculation valve position sensor
P1402 Exhaust Gas Recirculation metering orifice restricted
P1403 Exhaust Gas Recirculation differential pressure sensor
P1404 EGR Temperature Sensor circuit
P1405 Exhaust Gas Recirculation Differential Pressure Feedback Sensor upstream hose off or plugged
P1406 Exhaust Gas Recirculation Differential Pressure Feedback Sensor downstream hose off or plugged
P1407 EGR solenoid -No Flow Detected
P1408 EGR solenoid -Flow out of Self- Test Range
P1409 EGR Vacuum Regulator solenoid circuit malfunction
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The sensor for the EGR Valve position is not functioning correctly.

In order to give you accurate information. I need size of engine example 2.0 L 3.0L. but code P1400 means Differential Pressure feedback EGR circuit low input. Maybe your differential oil is low.

The OBD II code for P0400 is Exhaust Gas Recirculation Flow Malfunction.
I'm sure the only thing you have left is you may have to replace the EGR valve or check for any leak from the vaccum lines going to to EGR valve.

P00A0 is a factory readable only code (i.e. only ford dealers have the computer to read it)
the P0400 is a generic E.G.R. flow restriction code. so yes a dvom (multimeter) and a vacuum pump to diagnose it correctly, also check for loose wires as ford harness connectors are known to fail alot due to crappy phenolic content in the plastic and heat combined they can warp and / or corrode the contacts

I fixed it by buying a new EGR valve and the codes have not returned.