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Anthony
Anthony, Ford Technician
Category: Ford
Satisfied Customers: 11750
Experience:  ASE Master Automobile Technician with over 20 years exp.
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1996 Ford Aspire: obd..Scan tool..p0400 = egr flow malfunction3.)

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1996 Ford Aspire (OBD II)
Popping the following trouble Codes
(Answers from Scan tool are vague for this novice, Please explain further)
1.) P0140 = 02 Sensor circuit
2.) P0400 = EGR Flow Malfunction
3.) P0170 = Fuel Trim Malfunction Bank 1
4.) P0470 = Exhaust Pressure Sensor Circuit Malfunction
Hello! Welcome to justanswer!

Ok, for the 140, replace the Front O2 Sensor and that code will be gone. No way out of that.

For the 400 wait until you fix the 140 and 470.


To fix the 470, replace the EGR Boost Sensor. Then reset all the codes and see what if any come back. Heres a picture of the sensor.

The boost Sensor and the O2 should get rid of the 170 and 400 as well.
Anthony and 3 other Ford Specialists are ready to help you
Customer: replied 5 years ago.
Did you get my reply, I didnt get a pic of the sensor, please send again, preferably
to clarkal at hotmail dot com
Oh, sorry about that. Here it is. Also let me know the outcome in case theres more or less codes, id be happy to stick with you. Bookmark this page.

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