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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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I have the following trouble codes and I'm to find out what

Customer Question

I have the following trouble codes and I'm to find out what they exactly are:
JA: Do you have a scan tool to read the codes?
Customer: P0401, P0402, P0171, and P1132.
JA: What is the model/year of your Ford?
Customer: 2002 Ford Escape XLS.
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: going to do it myself. planning to get the parts. so far, I need an EGR valve and I think 2 O2 sensors.
JA: Anything else you think the mechanic should know?
Customer: no.
Submitted: 1 year ago.
Category: Ford
Expert:  david craig replied 1 year ago.

Hi Im David, thanks for visiting the site. allow me a few moments to look some information up on your vehicle, thanks.

Expert:  david craig replied 1 year ago.

With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor. and to make sure you remove the egr valve and thoroughly clean the carbon deposits from it and the passages.

The code P0401 is usually set by a bad DPFE sensor.

Check the Differential Pressure Feedback EGR (DPFE) Sensor voltage Key On Engine Off (KOEO). It should read roughly 1.0v.
If the voltage is not between 0.7v and 1.2v, verify the Brown/White (BR/WH) wire is 5v and that the Gray/Red (GY/RD) wire is a good ground.
If the reference voltage and ground are OK, but the voltage is out of range, replace the DPFE sensor.

The DPFE sensor has been updated to part number 4U7Z-9J460-AA.

Expert:  david craig replied 1 year ago.

P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs:
Fuel system
Excessive fuel pressure.
Leaking/contaminated fuel injectors.
Leaking fuel pressure regulator.
Low fuel pressure or running out of fuel.
Vapor recovery system.
Induction system:
Air leaks after the MAF.
Vacuum Leaks.
PCV system.
Improperly seated engine oil dipstick.
EGR system:
Leaking gasket.
Stuck EGR valve.
Leaking diaphragm or EVR.
Base Engine:
Oil overfill.
Cam timing.
Cylinder compression.
Exhaust leaks before or near the HO2Ss.
A SHRTFT-1,2 PID value between -25% to +35% and a LONGFT-1,2 PID value between -35% to +35% is acceptable. Reading beyond these values indicate a failure.

Expert:  david craig replied 1 year ago.

P1132 the following things will need to be checked.

Base engine mechanical fault (e.g., compression, valve timing)Check air cleaner element and air cleaner housing for blockageEVAP vapor recovery system has failed (canister full of fuel)Fuel pressure too high, contaminated or leaking fuel injectorsHO2S has failed (it may be contaminated with fuel, silicone or water)

Expert:  david craig replied 1 year ago.

hows it going?