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Ford Master
85,242 Answers
- Posted on Sep 16, 2009
Re: How do you repair codes PO141 and PO136 2000 Ford...
Causes
A code P0401 most likely means one or more of the following has happened:
- The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced, this is the common cause
- There is a blockage in the EGR (tube), most likely carbon buildup
- The EGR valve is faulty
- The EGR valve may not be opening due to a lack of vaccuum
Possible Solutions
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
- Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
- Clean out the EGR valve and/or tubing to remove deposits
- Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
- Replace the DPFE sensor (with a good quality / OEM one)
- Replace the EGR valve
Symptoms
There may be no visible symptoms to the driver. Poor fuel mileage, possible misfire, depending on O2 sensor position when sticking.
Causes
A code P0136 may mean that one or more of the following has happened:
- Faulty O2 sensor leak in exhaust close to O2 sensor, faulty O2 sensor is the common cause.
- Short to voltage on O2 signal circuit
- Open in circuit resistance caused by corrosion in connector
Possible Solutions
- Replace the second oxygen sensor on bank 1
- Repair open or short in signal circuit
- Clean corrosion from connector
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