Carl Denk wrote:
> Had a 2002 Mercury Cougar with a 2.5L. V-6 that was getting less than
> great fuel mileage (27 vs. 32 MPG highway) for some time, thought it was
> the alcohol in the gasoline, since that came about the same time to the
> area. Recently got the check engine light, scanned with the AutoXray
> Ezlink scanner I have had for some years, replaced the EGR valve, but
> the light and P0401 code came back in a week. Tracked the problem down
> to a sticky DPFE (Differential pressure feedback EGR) sensor, which I
> replaced. The fuel mileage came back to what we have known. Anyone with
> a 2000 - 2003 Ford should check this out.
>
> The valve is available for $35 from your local parts store, and $75 from
> Ford, but I have heard of issues of connectors not matching, etc. on the
> non-Ford parts.
>
> I was looking into buying a new scan tool, and the Scantool.net
> "Scangauge II" caught my attention. It is small, plugs into the OBDII
> connector, and in addition to scanning for codes, provides fuel mileage
> (both average, and instantaneous) , miles to empty, etc. Does it also
> provide sensor readings, like the DPFE voltage, and other sensors? My
> current scanner doesn't provide some of the sensor readings. Would have
> helped with the diagnosis. The sensor is buried behind the engine, and
> the connector doesn't lend it self to breaking in.  If the Scangauge II
> doesn't provide the necessary info, is there suggestions on something
> that will, without getting into the $300+ range.

DPFE is not part of the standard OBDII PID set. If you can find out what the 
mfr specific mode/PID is, you can add it using XGauge:

http://scangauge.com/support/xgauge.shtml

If you don't mind using a PC based scan tool, ScanXL supports hundreds of 
Ford-specific PIDs:

http://www.palmerperformance.com/support/supported_vehicles/ford_enhanced.php

Best regards,

Vitaliy Maksimov
ScanTool.net, LLC
+1 623 582-2366
http://www.scantool.net 

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